DHT11 Temperature Humidity Module
4.3Editor score
Beginner-friendly single wire
Digital temperature output
Dual sensor package
In this guide
Arduino temperature sensors make it possible to monitor indoor conditions, water tanks, plant areas, appliances, and other temperature-sensitive spaces. A useful sensor must combine an appropriate measurement range, dependable accuracy, straightforward wiring, and compatibility with the Arduino platform and the project you intend to build.
This guide compares ten temperature and temperature-humidity sensor modules using the specifications supplied for each product. The list covers single-wire digital sensors, I2C modules, waterproof probes, and multipacks, with attention to voltage, interface, range, accuracy, resolution, and included components.
Each review identifies the strongest feature and the practical compromises associated with the product, helping you distinguish between a basic learning module and a sensor suited to continuous monitoring. Product availability and prices can change, so confirm current details before purchasing.
Top 3 Picks for Best Arduino Temperature Sensor
AHT30 Temperature and Humidity Module
5.0Editor score
I2C digital communication
Wide operating voltage
High measurement precision
Gikfun Waterproof DS18B20 Probe
4.4Editor score
Waterproof one-meter probe
Wide temperature range
Adapter module included
Top 10 Best Arduino Temperature Sensor in 2026 Compared
The comparison below places the ten sensors by interface, measurement capability, operating voltage, and typical installation environment, making it easier to identify the right option for an Arduino learning project, indoor monitor, or waterproof temperature probe.
ProductsSpecificationsEditor scorePrice
Best Budget
HiLetgo DHT11 5-Pack
Single-wire digital output
3.3–5.5V operating range
0–50°C temperature range
20–95% humidity range
4.5Editor score
Editor's Choice
AHT30 I2C 2-Pack
I2C digital output
2.0–5.5V operating range
-40–85°C temperature range
0–100% humidity range
5.0Editor score
Best Premium
Teyleten SHT31-D 3-Pack
I2C digital output
2.4–5.5V operating range
-40–125°C temperature range
0–100% humidity range
4.7Editor score
Gikfun DS18B20 Adapter 3-Pack
Waterproof one-wire probe
3.3–5V operating range
-55–125°C temperature range
Adapter board included
4.4Editor score
WWZMDiB DS18B20 5-Pack
Waterproof one-wire probe
3–5.25V operating range
-55–125°C temperature range
4.7K resistors included
4.4Editor score
DHT11 Digital 2-Pack
Single-wire digital output
3.3–5V operating range
0–50°C temperature range
20–95% humidity range
4.3Editor score
DROK Waterproof DS18B20 2-Pack
Waterproof one-wire probe
3.0–5.5V operating range
-55–125°C temperature range
Adapter boards included
4.9Editor score
Gikfun DS18B20 5-Pack
Waterproof one-wire probe
3.0–5.5V operating range
-55–125°C temperature range
One-meter cable length
4.5Editor score
HiLetgo DHT22 AM2302
Single-bus digital output
-40–80°C temperature range
0–100% humidity range
Screw mounting hole
4.4Editor score
HiLetgo DS18B20 5-Pack
Waterproof one-wire probe
3.0–5.5V operating range
-55–125°C temperature range
Five-probe pack
4.5Editor score
1. AHT30 Temperature and Humidity Module – Best Overall Arduino Temperature Sensor
AHT30 Temperature and Humidity Module
I2C digital communication
2.0–5.5V operating range
-40–85°C measurement range
0.01°C temperature resolution
The AHT30 module is a versatile digital temperature and humidity sensor for Arduino projects that need more precision than a basic entry-level module. It has a 5.0 rating, with stated temperature accuracy of ±0.3°C, humidity accuracy of ±2%RH at 25°C, and a temperature resolution of 0.01°C. The result is a specification set that looks especially attractive for indoor monitoring, environmental logging, and projects where relatively small changes in readings matter.
Pros
- Broad operating voltage
- High stated temperature accuracy
- Supports multiple I2C devices
- Four-wire test connections
- Low power consumption
Cons
- I2C address conflicts need attention
- Humidity accuracy varies by temperature
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Its I2C interface is one of the most useful characteristics. Rather than sharing a proprietary-style single data line, the module supports a conventional two-wire communication arrangement and can coexist with other I2C devices when addresses are configured appropriately. The operating range of 2.0–5.5V is also broad, allowing the module to work with both 5V and 3.3V-oriented Arduino environments when its I2C levels are handled correctly. A four-wire test lead makes bench wiring quicker and more orderly.
There are trade-offs. I2C generally requires more attention to address selection than a straightforward DHT11 connection, and the stated ±2%RH humidity accuracy applies at 25°C rather than across the complete humidity range. Temperature readings also depend on where the module is mounted: a sensor close to a processor, display, or regulated power source may not experience the environment you intended to measure. The 0.01°C resolution is useful for reporting and control, but it should not be mistaken for equivalent real-world absolute accuracy.
This is the strongest general-purpose pick for a builder who wants precise digital readings, a broad voltage range, and a clean I2C interface. Choose it for a room monitor, environmental logger, or multi-sensor Arduino system. For the simplest possible tutorial, a DHT11 may be easier; for a remote or wet installation, a waterproof one-wire probe will often be a better physical fit.
Precision for Meaningful Environmental Readings
The ±0.3°C stated temperature accuracy and fine resolution make the AHT30 well suited to projects in which consistent, repeatable readings are more useful than a coarse display. Placement away from heat-generating electronics will help the sensor reflect the intended space.
Flexible Integration With I2C
The I2C connection supports a clean multi-device design, while the 2.0–5.5V supply range offers compatibility with common Arduino power systems. Check the logic levels of the selected board and account for each peripheral's I2C address before connecting several modules.
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2. DHT11 Digital 2-Pack – Best Budget Arduino Temperature Sensor
DHT11 Digital 2-Pack
Single-wire digital output
3.3–5V operating range
0–50°C temperature range
20–95% humidity range
The two-pack DHT11 remains one of the most approachable Arduino temperature sensor options. Its digital output, 3.3–5V operating range, and simple communication protocol make it a common starting point for classroom projects, weather displays, and basic indoor monitors. The module carries a 4.3 rating, which reflects its usefulness as an entry-level sensor even though its specifications are considerably less ambitious than those of the AHT30, SHT31-D, or DHT22.
Pros
- Simple wiring arrangement
- Low programming complexity
- Digital calibrated output
- Useful Arduino compatibility
- Convenient two-pack quantity
Cons
- Modest measurement accuracy
- Limited temperature range
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Its main appeal is the small number of connections required for useful environmental data. A project can obtain both temperature and relative humidity without an analog conversion, and the integrated electronics produce a digital signal that is easier to interpret through established Arduino libraries. The measurement ranges are approximately 0–50°C for temperature and 20–95%RH for humidity, with stated errors of ±2°C and ±5%RH. That is adequate for learning, status displays, fan control, and broad household monitoring.
The limitations are equally clear. The DHT11 should not be selected for precision thermometry, freezer monitoring, industrial process control, or any application requiring the broad range offered by the SHT31-D or waterproof DS18B20 probes. Its wider tolerance also means that small differences between nearby samples may not be meaningful. The sensor needs adequate spacing from the Arduino board, since heat from the processor and power regulator can influence the enclosure temperature.
Buy this module if you are learning how to connect a digital environmental sensor or need a straightforward temperature and humidity indicator at a modest entry point. The two-pack is convenient when comparing readings or building a second monitoring point. For higher precision, wider temperature coverage, or wet environments, choose one of the more capable options in this guide.
Simple Wiring for First Projects
The single-wire interface reduces both wiring and programming complexity, making this a useful option for learners. Existing Arduino temperature-sensor libraries and familiar examples make it easier to move from assembly to a working display.
Best Used as a Broad Indicator
The DHT11 works best when the goal is to show general room conditions or trigger a simple action within a broad range. Use it for demonstrations and noncritical monitoring rather than precision measurement.
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3. Gikfun Waterproof DS18B20 Probe – Best Premium Arduino Temperature Sensor
Gikfun Waterproof DS18B20 Probe
Waterproof one-meter probe
3.3–5V operating range
-55–125°C temperature range
Adapter module included
The Gikfun EK1183 set combines a one-meter waterproof DS18B20 probe with an adapter module, offering a convenient route to temperature monitoring away from the Arduino enclosure. It has a 4.4 rating and three complete probe sets. Its stated 3.3–5V operating range and -55–125°C measurement range make it more versatile than basic air-mounted temperature modules, particularly for tanks, cabinets, greenhouse areas, and equipment monitoring.
Pros
- Useful temperature span
- Waterproof probe enclosure
- Adapter simplifies connections
- One-meter cable reach
- Multiple probe set
Cons
- Lead limited to 85°C
- Additional pull-up may be needed
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The adapter is a meaningful convenience. It allows the probe to connect to a microcontroller more directly, with the board carrying a pull-up resistor for the one-wire data line. A three-wire arrangement is easy to follow: red for power, yellow for data, and black for ground. The one-meter lead also gives an installer room to separate the sensing tip from a warm controller, an advantage when the probe must be inserted into a vessel or placed in a distant location.
Physical temperature limits deserve careful attention. Although the DS18B20 itself has a listed measurement range of -55–125°C, the supplied lead can withstand a maximum of 85°C. The probe should therefore be treated as unsuitable for temperatures above that cable rating, regardless of the sensor chip's broader stated capability. Long cables and several connected probes can also affect communication reliability, so quality wiring and correct pull-up placement remain important.
This package is a strong choice for a builder who wants flexibility, reach, and a protected sensing element rather than a bare board sensor. It is particularly appropriate for a fish tank, appliance interior, plant enclosure, or equipment cabinet. Choose it when the adapter and three-probe quantity save assembly time, and use a separate external pull-up if your setup needs one.
Protected Sensing in Demanding Locations
The waterproof probe construction makes the sensor practical for moist or enclosed installations. Secure the cable and keep the connection area dry even when the sensing end is designed for wet environments.
A Useful Balance of Reach and Accuracy
A one-meter cable provides enough separation for many Arduino projects while avoiding a very long, potentially noisy one-wire run. The included adapter streamlines the physical connection, while the data-line resistor still deserves attention in multi-probe layouts.
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4. HiLetgo DHT11 5-Pack – Best Multi-Pack Arduino Temperature Sensor
HiLetgo DHT11 5-Pack
Single-wire digital output
3.3–5.5V operating range
0–50°C temperature range
Five modules and cables
The HiLetgo five-pack provides five DHT11 modules with cables, giving Arduino builders enough sensors for classroom groups, comparative experiments, or a distributed room-monitoring setup. The product has a 4.5 rating and uses a pre-calibrated digital output. Its 3.3–5.5V supply range, simple one-wire communication, and compact 28 × 12 × 7.2mm board size make it easy to incorporate into small projects.
Pros
- Five modules included
- Cables simplify connections
- Onboard pull-up resistor
- Wide voltage compatibility
- Straightforward digital protocol
Cons
- Basic temperature accuracy
- Humidity accuracy is limited
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Each module includes an onboard bypass capacitor and pull-up resistor, reducing the number of extra components required for a basic installation. The supplied cables make the package more practical for beginners than loose sensor boards without leads. A temperature range of 0–50°C and humidity range of 20–90%RH suit ambient indoor demonstrations, while the stated errors of ±2°C and ±5%RH are appropriate for general awareness rather than exact control.
The five-pack is the reason to consider this product, but it is not a five-sensor precision system. DHT11 readings should not be expected to resolve small temperature changes or highly localized humidity differences. The single-bus wiring method also requires separate signal pins when several sensors are connected, and each module needs adequate clearance from the Arduino and from its own warmed enclosure. Long or poorly terminated wires can affect reliability.
Choose this pack for teaching multiple students, comparing conditions in several rooms, or building a simple sensor network around an Arduino Uno or compatible board. It offers good convenience and a moderate 4.5 rating. If your project needs higher accuracy, broader environmental coverage, or a compact combined sensing solution with tighter specifications, move to the AHT30, SHT31-D, or DHT22 options.
Convenient for Group Learning
Five ready-to-connect modules allow a class or makerspace to build identical sensor stations. Uniform components also make it easier to compare readings between locations and identify wiring or placement differences.
Preassembled Digital Interface
The onboard resistor and capacitor simplify the standard module arrangement, and the included leads reduce assembly time. This makes the pack well suited to first experiments with digital environmental sensing.
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5. Teyleten SHT31-D 3-Pack – Best Wide-Range Arduino Temperature Sensor
Teyleten SHT31-D 3-Pack
I2C digital output
2.4–5.5V operating range
-40–125°C temperature range
Three-module pack
The Teyleten SHT31-D three-pack stands out for its stated -40–125°C temperature range, broader than most of the digital modules in this guide. It also measures humidity from 0–100%RH, with listed accuracies of ±0.3°C and ±2%RH. The 4.7 rating reflects a strong combination of specifications, and the I2C interface is a sensible choice for a multi-sensor environmental system.
Pros
- Exceptionally broad temperature range
- Strong stated temperature accuracy
- Useful I2C integration
- Wide humidity coverage
- Three sensors included
Cons
- I2C addresses need coordination
- Accuracy is not guaranteed everywhere
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The 2.4–5.5V operating range gives this module broad compatibility with common microcontroller power systems. I2C also uses shared communication lines, making it easier to connect several peripherals when their addresses do not conflict. For temperature-only work, the wide span supports outdoor cabinets, controlled enclosures, and cooler environments beyond the DHT11's 0–50°C limit. The three-pack is particularly attractive for comparing different zones around a single controller.
As with any environmental sensor, the quoted range does not mean the module is equally accurate throughout that range. Listed temperature accuracy is ±0.3°C, while humidity accuracy is specified as ±2%RH, but real readings will also depend on calibration, airflow, enclosure design, and proximity to heat. I2C bus capacitance and address management can become relevant if several modules share long connection leads.
This is an excellent fit for a high-quality multi-point logger or an educational comparison of warm and cool areas. Select it when the wide temperature range and I2C convenience justify a more advanced sensor. For a single low-cost learning setup, a DHT11 remains simpler; for a submerged probe, choose a physically suitable DS18B20 rather than an exposed board.
Useful Thermal Headroom
The -40–125°C specification gives designers room to work beyond ordinary room temperatures. Use it for enclosure or equipment testing, while recognizing that the module's physical materials and wiring still impose practical limits.
Efficient Multi-Sensor Architecture
I2C is a practical choice when several environmental modules must communicate with one Arduino. Check addresses before wiring, and keep data and ground routing organized to reduce the chance of communication errors.
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6. WWZMDiB DS18B20 5-Pack – Best Multi-Probe Arduino Temperature Sensor
WWZMDiB DS18B20 5-Pack
Waterproof one-wire probes
3–5.25V operating range
-55–125°C temperature range
4.7K resistors included
This five-pack of waterproof DS18B20 probes is designed for projects that need several remote temperature points. It has a 4.4 rating, a 3–5.25V operating range, and a stated measurement range of -55–125°C with ±0.5°C accuracy. The probes are suitable for wet or moist environments, making the set relevant to tanks, plant-growing systems, incubators, and equipment monitoring.
Pros
- Five waterproof probes
- Resistors included for wiring
- Broad temperature range
- Compatible with major platforms
- Simple color-coded leads
Cons
- No adapter boards included
- Long cable runs need care
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Five 4.7K resistors are included, addressing one of the common practical requirements of a one-wire temperature circuit. Red identifies power, yellow carries data, and black is ground, producing a consistent wiring scheme across every probe. Compatibility is listed with Arduino, Raspberry Pi, ESP32, and STM platforms, so the set can be used in several embedded ecosystems rather than being limited to one board family.
Unlike adapter-equipped bundles, this package does not include small carrier boards. That means the builder must connect the probes to a breadboard or permanent controller interface and install the resistor correctly. Multiple one-wire sensors can share power and data when the wiring is properly planned, but long leads increase capacitance and may require a stronger pull-up arrangement. A waterproof sensing tip does not make the exposed connections safe to submerge.
Choose this pack when you need a coordinated group of temperature probes and already understand the one-wire interface. It is particularly useful for comparing several tanks, shelves, or machine locations. If you want the fastest path to a finished setup, a bundle with adapter boards may be more convenient; if you only need one learning sensor, a smaller pack reduces unused inventory.
Five Flexible Monitoring Points
A shared one-wire bus can connect several probes efficiently, making this set useful for distributed temperature logging. Unique sensor addresses allow the Arduino sketch to identify and read each location separately.
Resistors Included for Integration
The supplied 4.7K resistors help remove an extra shopping step from a standard one-wire build. Confirm that the data line has the required pull-up, and keep the wiring arrangement consistent across all five probes.
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7. DROK Waterproof DS18B20 2-Pack – Best Complete Arduino Temperature Sensor Kit
DROK Waterproof DS18B20 2-Pack
Waterproof stainless steel probes
3.0–5.5V operating range
-55–125°C temperature range
Complete accessory bundle
The DROK bundle is one of the most complete options here, pairing two waterproof DS18B20 probes with adapter boards, female-to-female jumper wires, and 4.7K resistors. Its 4.9 rating is the highest among the ten products. The set supports a -55–125°C range with ±0.5°C accuracy, while the 3.0–5.5V operating range supports common Arduino and other microcontroller power arrangements.
Pros
- Strongest listed rating
- Stainless steel probe housing
- Adapter boards included
- Resistors and jumpers included
- Wide platform compatibility
Cons
- Two probes limit large arrays
- Data pull-up still needs checking
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The hardware is described as a stainless steel probe with waterproof, corrosion-resistant sealing. That construction is appropriate for continuous submersion and wet environments, although the electrical connections must remain dry. The adapter boards and color-coded red, yellow, and black leads make the assembly easy to follow. This is especially helpful for beginners who understand the one-wire principle but would rather not design a carrier circuit from scratch.
The package is almost everything required for a two-point installation, yet one detail still needs verification. The adapter has an integrated pull-up, and the instructions also recommend a 4.7K resistor between data and power for stability. Do not install multiple pull-ups indiscriminately; determine the intended circuit and calculate a suitable effective resistance if both the board and an extra resistor are present. Long cables or numerous branches can also increase bus capacitance and make clean power and short wiring important.
This is a strong all-around kit for a maker who wants protected probes and all the basic connection hardware together. The two-probe quantity suits a dual-zone tank, a pair of equipment locations, or a comparison experiment. Choose a larger probe pack for extensive arrays, but for a compact, organized installation, this kit offers a particularly balanced combination of protection, accessories, and rating.
Protected Probe Construction
The stainless steel enclosure and sealing are intended for wet locations and continuous submersion. Route the cable to a dry electronics area, inspect seals before installation, and avoid exposing the soldered connections to water.
Everything Needed for Assembly
Adapter boards, jumpers, and resistors create a more self-contained project package. Review the pull-up arrangement before assembly so that the board and external resistor produce a sensible effective resistance for the one-wire data line.
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8. Gikfun DS18B20 5-Pack – Best Long-Cable Arduino Temperature Sensor
Gikfun DS18B20 5-Pack
Waterproof one-meter probes
3.0–5.5V operating range
-55–125°C temperature range
Five-probe pack
Gikfun's EK1083 five-pack offers five waterproof DS18B20 probes with approximately one-meter cables. It has a 4.5 rating, a 3.0–5.5V supply range, and the familiar -55–125°C temperature capability. The generous probe count makes it practical to monitor several locations while the longer leads allow each sensing tip to be positioned away from the Arduino and its heat sources.
Pros
- Five remote sensing points
- One-meter probe cables
- Simple single-bus interface
- Wide voltage compatibility
- Low component count
Cons
- External pull-up usually required
- No adapter boards included
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The wiring is consistent across the set: red for VCC, yellow for data, and black for ground. Because the DS18B20 uses a single-bus interface, multiple probes can share the same data connection as long as the Arduino sketch addresses each sensor correctly. This reduces wiring compared with several independent digital sensors. Applications include thermostatic controls, consumer products, industrial systems, greenhouses, and general thermally sensitive equipment.
The pack does not include carrier boards, and the product information specifically recommends a 4.7K resistor between data and VCC to make testing easier. That resistor is an important part of the one-wire circuit rather than a minor accessory. Five long cables can add significant bus capacitance, so secure and route them carefully. If a sensor becomes unreliable, test it independently with a short lead before troubleshooting the full network.
This set is a good choice for distributed monitoring across a workbench, aquarium, cabinet, or model greenhouse. It provides more than enough probes for a meaningful multi-location project without requiring multiple purchases. If ease of assembly is the priority, choose a bundle with adapters; if flexible placement and quantity matter more, this five-pack is hard to overlook.
Remote Placement with One-Meter Leads
The cable length helps place the sensing tip inside a tank, enclosure, or machinery housing without crowding the controller. Keep the Arduino outside the measured environment when self-heating could distort the result.
Efficient Shared One-Wire Wiring
Sharing data, power, and ground among the probes keeps the overall circuit manageable. Add the recommended 4.7K pull-up and use reliable connections so that all five sensors remain dependable on the shared bus.
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9. HiLetgo DHT22 AM2302 – Best Humidity Arduino Temperature Sensor
HiLetgo DHT22 AM2302
Single-bus digital output
-40–80°C temperature range
0–100% humidity range
Two-module pack
The HiLetgo DHT22/AM2302 pair combines a -40–80°C temperature range with a 0–100%RH humidity range and tighter stated accuracy than the DHT11. Its 4.4 rating makes it a logical middle ground for Arduino environmental projects. The AOSONG AM2302 sensor provides bidirectional serial data on a single bus, preserving the familiar module format while improving the underlying measurement capability.
Pros
- Higher stated accuracy than DHT11
- Broad temperature measurement
- Full stated humidity range
- Bidirectional serial data
- Mounting hole included
Cons
- Single-bus protocol needs library support
- Longer sampling behavior
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Temperature accuracy is listed at ±0.5°C, and humidity accuracy at ±2%RH. Those figures make the DHT22 useful for indoor climate displays, greenhouse monitoring, and basic environmental control that benefits from more dependable readings than a DHT11. A fixing screw hole also makes physical installation easier than with a loose breakout board, while the two-pack allows one module for each of two monitored locations.
The DHT22 is not an effortless drop-in substitute for every DHT11 sketch. Libraries may distinguish the two sensor families, and their sampling and conversion behavior should be respected rather than read continuously without delay. Its single-bus connection is also different from I2C, so you cannot combine it with an I2C sensor on the same pins without a suitable bus arrangement. Ventilation around the module is important because a sealed enclosure can trap heat and produce humidity-related errors.
Choose the DHT22 when a familiar DHT-style sensor is desired but the DHT11's range and accuracy are too limited. It is well suited to room monitoring, simple automation, and educational projects that do not require I2C sophistication. For installations exposed to moisture, use a physically protected probe instead of this board-style module.
Improved Environmental Detail
The tighter stated accuracy and broader range make the DHT22 more useful when environmental conditions fluctuate or a more precise set point is needed. Good airflow around the module remains essential for representative readings.
Straightforward Two-Point Monitoring
Two modules support comparisons between locations such as a greenhouse and a room, or two sides of an enclosure. Each sensor requires its own data connection when using the standard single-bus arrangement.
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10. HiLetgo DS18B20 5-Pack – Best Value Waterproof Arduino Temperature Sensor
HiLetgo DS18B20 5-Pack
Waterproof one-meter probes
3.0–5.5V operating range
-55–125°C temperature range
Five-probe pack
The HiLetgo five-pack consists of waterproof, one-meter DS18B20 temperature probes with stainless steel sensing ends. It has a 4.5 rating and supports a 3.0–5.5V operating range. The listed -55–125°C measurement span covers much more than ordinary room temperature, while the five-probe quantity is well suited to distributed temperature logging across tanks, cabinets, plant areas, or equipment.
Pros
- Five protected probes
- One-meter cable length
- Wide measurement range
- Simple color-coded wiring
- Broad platform compatibility
Cons
- Pull-up resistor not included
- Adapters not included
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The lead colors follow a common convention: red for VCC, yellow for data, and black for ground. A one-wire bus allows the probes to share connections efficiently, which keeps a five-point installation from requiring a separate data pin for every sensor. The product information recommends a 4.7K resistor between data and VCC, which should be added to the circuit if it is not already present elsewhere.
The main compromise is the absence of adapter boards and included resistors. A builder must provide the interface hardware or connect the probes carefully on a breadboard. The one-meter leads also add capacitance to the data bus, and a poor connection at any probe can affect reliability for the entire group. As with other waterproof probes, only the sensing end should be exposed to water; the solder joints and controller need protection.
This pack is a practical choice when a project needs several temperature points and the builder already has the necessary one-wire components. It offers a strong 4.5 rating, broad range, and protected sensing tips without requiring humidity capability. Choose a bundled kit with adapters and resistors for easier assembly, or pick a single higher-precision environmental module if your application only requires one indoor reading.
Protected Tips for Varied Locations
The waterproof stainless steel probes can be placed in wet or humid locations where a bare sensor board would be unsuitable. Keep every electrical termination outside the wet area and inspect the cable before each installation.
A Practical Multi-Point Foundation
Five one-meter probes provide enough reach for a meaningful distributed setup. Add the recommended pull-up resistor, maintain consistent wiring, and consider signal integrity if long branches or many sensors cause intermittent readings.
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Buying Guide – How to Choose the Best Arduino Temperature Sensor
The right Arduino temperature sensor depends on where the sensor will be installed, how much accuracy the project requires, which communication interface your sketch can support, and whether temperature alone or combined humidity data is needed.
Temperature Measurement Range
Begin by matching the sensor's stated range to the temperatures the project will actually encounter. The DHT11 and the standard DHT11 listing cover 0–50°C, which is suitable for most room-temperature tasks. The AHT30 extends to -40–85°C, the DHT22 to -80°C, and the SHT31-D to -125°C. The DS18B20 products use a listed -55–125°C range, giving them broad coverage for both cool and warm locations. A wide numerical range does not guarantee equal accuracy throughout that span, so review the quoted tolerance and consider the physical limitations of the module, cable, enclosure, and sealant.
Choose a range that comfortably contains the expected conditions with some margin. For indoor climate projects, either a DHT11 or a higher-precision digital module will usually suffice. For outdoor cabinets, aquatic systems, or equipment that can become hot or cold, a wider-range sensor such as the SHT31-D or a protected DS18B20 probe is more appropriate.
Accuracy and Resolution
Accuracy describes how close a reading is expected to be to the true value, while resolution describes the smallest change the output can represent. A sensor can report fine increments without being equally accurate in every environment. The DHT11 lists ±2°C temperature accuracy and 1°C resolution, the AHT30 lists ±0.3°C accuracy with 0.01°C resolution, and the DS18B20 options generally list ±0.5°C accuracy. These figures make the latter modules more suitable for tighter control points, trend analysis, and applications in which a small temperature shift needs to be recognized.
Do not select on resolution alone. Consider calibration, self-heating, enclosure design, airflow, and the distance from the Arduino. A high-resolution sensor mounted directly above a voltage regulator may produce excellent numbers that poorly represent the environment you wanted to monitor.
Temperature Only or Humidity Too
A temperature-only probe is ideal when humidity is irrelevant or when the sensing element must be physically inserted into water, soil, or machinery. Every DS18B20 option in this guide provides temperature measurements only. Temperature-and-humidity modules such as the DHT11, DHT22, AHT30, and SHT31-D provide a broader environmental picture and are more useful for room climate displays, greenhouse projects, and combined comfort monitoring.
Humidity sensing adds useful information but also introduces placement concerns. The sensor should be exposed to representative airflow and kept away from condensation, direct water, and stagnant pockets inside an enclosure. If a project only needs water temperature, a waterproof temperature probe is usually simpler and more physically appropriate than a humidity module.
Communication Interface and Wiring
The interface determines how the Arduino communicates with the sensor. DHT11 and DHT22 modules use a single-bus digital connection with well-established library support. The AHT30 and SHT31-D use I2C, which supports neat shared buses but requires attention to device addresses and logic levels. DS18B20 probes use the 1-Wire protocol, allowing multiple probes to share a data line when each has a unique address. Each approach is workable, but the libraries and sketch structure differ.
Beginners generally find the DHT11 easiest, while I2C is attractive for compact systems carrying several digital peripherals. One-wire is particularly useful for distributed probes. Check the Arduino board's pin voltage, confirm that the appropriate library supports the exact sensor, and plan resistor and pull-up requirements before assembling the project.
Operating Voltage and Logic Compatibility
The listed supply ranges are generally broad enough for common Arduino boards, but power and signal voltage are related issues. The AHT30 operates from 2.0–5.5V, the SHT31-D from 2.4–5.5V, the DS18B20 sets generally from 3.0–5.5V, and the DHT11 products from approximately 3.3–5V. These figures help narrow the selection, although some boards use 3.3V logic and others use 5V logic.
Use a common ground between the sensor and Arduino, power the module from a suitable pin, and verify the output levels before connecting a 5V sensor signal directly to a 3.3V input. When uncertain, consult the documentation for both boards rather than relying solely on the supply-voltage label.
Environmental Protection and Probe Design
Physical construction matters as much as the electrical specification. A bare DHT11, DHT22, AHT30, or SHT31-D board is best in a dry, ventilated enclosure. The DS18B20 products use waterproof probe tips and insulated leads, making them more suitable for tanks, moist spaces, and remote sensing locations. Even with a waterproof probe, the soldered end of the cable and the Arduino electronics should remain dry.
For submerged use, inspect the probe seal and secure the cable so that it cannot pull against the connection. For indoor sensors, use a ventilated enclosure and separate the sensor from processors that generate heat. Environmental protection is most effective when the mechanical installation is considered alongside the electrical design.
Cable Length and Installation Distance
A longer probe cable lets the sensing tip sit inside an aquarium, cabinet, appliance, or distant environment while the Arduino remains accessible. Most DS18B20 packs in this guide use approximately one-meter leads, which suits many bench projects. Longer wiring can slow one-wire communication and increase bus capacitance, so the controller should use suitable pull-up resistance and clean connections. More than one 4.7K resistor in parallel can produce an effective resistance lower than intended, so plan the network rather than adding pull-ups casually.
For I2C and single-bus environmental boards, shorter wiring is generally easier. If a long run is unavoidable, use suitable wire, secure it away from motors and heating elements, and verify that readings remain stable before installing the project permanently.
Pack Size and Included Accessories
Pack size should reflect the actual monitoring plan. A two-pack is useful for a comparison or two-location monitor, while three- and five-packs support classrooms, greenhouses, tanks, and distributed logging. The HiLetgo DHT11 five-pack includes modules and cables, the Gikfun DS18B20 set includes probes with longer leads, and the DROK package adds adapter boards, jumper wires, and resistors. The WWZMDiB DS18B20 set includes resistors but not adapter boards, while the HiLetgo DS18B20 pack requires the builder to supply those parts.
Choose the quantity and accessories that make the project complete without creating unnecessary complexity. For a first Arduino experiment, one module or one probe may be enough. For a working installation, adapter boards, correct pull-up resistors, and matching cable lengths can save substantial troubleshooting time.
How to Use and Care for Your Arduino Temperature Sensor
Begin by identifying the sensor's connection type and checking the Arduino pinout. Wire power and ground first, then attach the signal connection using the sensor-specific library and example sketch. For a DHT11 or DHT22, use the designated digital pin and library-supported timing. For I2C modules, connect SDA and SCL to the correct board pins. For a DS18B20, connect the data lead to a digital pin and install the recommended 4.7K pull-up between data and power before taking a first reading.
Read the values serially at first and compare them with a known thermometer or a second sensor. Do not judge the installation solely by a single sample. Check for obvious heat from the Arduino, confirm that the sensor has time to stabilize, and leave adequate spacing between the controller and the sensing element. For humidity measurements, ensure airflow and avoid exposing the board to condensation or direct water.
For long-term use, secure cables, protect non-waterproof connections, and place the sensing tip where it experiences the environment you want to monitor. Periodic comparison against a trusted reference can reveal drift or installation problems. Handle DS18B20 probes by their cable rather than pulling on the sealed tip, inspect seals before wet installation, and never use the stated chip range to ignore the lower temperature limit of an attached cable or enclosure.
Frequently Asked Questions
What is the easiest Arduino temperature sensor for a beginner?
The DHT11 is usually the easiest because it uses a familiar single-bus digital connection and has extensive Arduino library and example support. It provides both temperature and humidity from one module. Start with a well-known library, allow the sensor to stabilize, and avoid reading it continuously without respecting its timing requirements.
Should I choose a DHT11 or DHT22?
Choose the DHT11 for basic room monitoring, learning projects, and situations where broad environmental readings are enough. Choose the DHT22 when you need a wider temperature range, tighter stated accuracy, or more useful humidity performance. The DHT22 is not always a drop-in replacement in every sketch, so verify that the selected library supports it.
Can I connect multiple DS18B20 probes to one Arduino?
Yes. The DS18B20 uses a 1-Wire bus, allowing multiple probes with unique addresses to share power, ground, and data. The data line normally needs a pull-up resistor, commonly 4.7K, and long or poorly connected cables can reduce reliability. Plan the wiring and test one sensor at a time when troubleshooting.
Are the waterproof DS18B20 probes safe for fish tanks?
Their sealed sensing tips are designed for wet environments and can be suitable for tank monitoring. The cable connections and Arduino must remain above water, and the probe should be secured without straining the leads. Confirm that the specific probe and sealant are appropriate for the water conditions and the expected temperatures.
What is the difference between I2C and 1-Wire temperature sensors?
An I2C sensor uses shared clock and data lines and normally requires a separate address for each device. A 1-Wire DS18B20 uses one data line and identifies each probe through a unique onboard address. I2C is convenient for compact digital peripherals, while 1-Wire is especially useful for multiple remote temperature probes.
Why do my Arduino temperature readings differ from a household thermometer?
A common cause is heat from the Arduino board, regulator, display, or power supply affecting the sensor. Placement, airflow, sensor calibration, and humidity can also influence the comparison. Move the sensor away from electronics, let it stabilize, and compare multiple readings over time rather than expecting a single instant match.
Do I need a pull-up resistor for every DS18B20 probe?
Usually, one appropriately placed pull-up on the shared data bus is enough. Adding 4.7K resistors from every probe to the supply can create an effective resistance that is too low for a long or multi-sensor network. If the adapter already includes a pull-up, check its value and avoid adding another unless the circuit design requires it.
Which sensor is best for measuring both temperature and humidity?
The AHT30 offers the strongest overall specifications in this group, including a 2.0–5.5V operating range, ±0.3°C stated temperature accuracy, and I2C communication. The SHT31-D is also strong when its very wide temperature range is important, while the DHT22 offers a familiar single-bus module with better specifications than the DHT11. Choose based on interface and placement as well as accuracy.
Final Thoughts on Choosing the Best Arduino Temperature Sensor
The AHT30 is the strongest all-around selection for a new Arduino project, combining high stated accuracy, a broad voltage range, fine resolution, and an I2C interface. The two-pack DHT11 is the most approachable budget option, while the Gikfun waterproof DS18B20 package earns the premium position through protected probes, useful reach, and included adapters.
Prioritize the physical environment before the specification sheet. Use a bare temperature-humidity module for dry, ventilated indoor spaces, and use a protected one-wire probe for tanks, wet areas, or remote points. Then choose the interface that your Arduino library and wiring plan can support, paying close attention to pull-up resistors, addresses, voltage levels, and the sensor's physical distance from heat-generating electronics.
Before purchasing, confirm the current product details, package contents, compatibility, and current price with the seller. Inventory, included accessories, and promotional conditions can change, so the final choice should match both the electrical requirements of your Arduino project and the environment where the sensor will operate.