Freetronics
Humidity and Temperature Sensor Module
Measure temperature and relative humidity with this simple, Arduino-compatible sensor module based on the DHT22. With just three connections (GND, power, and...
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Measure temperature and relative humidity with this simple, Arduino-compatible sensor module based on the DHT22. With just three connections (GND, power, and data), you can read both temperature and humidity from a single I/O pin on your microcontroller. An Arduino library is available to make integration quick and easy.
The module includes mounting holes for M3 or 1/8" bolts and a flat rear face, so it can be easily bolted or glued into your enclosure. Designed and made in Australia by Freetronics.
Key Features
- DHT22 Sensor – Reliable combined temperature and humidity measurement
- Simple 3-Wire Interface – GND, power, and a single data line
- Wide Voltage Range – 3–5 V operation for flexible integration
- Low Power – Just 4.3 mA during reads, even less when idle
- Blue Power LED – Visual indicator that the module is powered
- Mounting Holes – M3/1/8" bolt compatible for secure installation
Specifications
- Temperature Range: −40 °C to +80 °C (±0.5 °C accuracy)
- Humidity Range: 0–100% RH (2–5% accuracy)
- Sample Rate: 0.5 Hz (one reading every 2 seconds)
- Operating Voltage: 3–5 V DC
- Current Draw: 4.3 mA (reading), less when idle
- Dimensions: 31 × 23 × 4 mm
Ideal For
- Weather stations and environmental monitoring
- Arduino and microcontroller projects requiring climate data
- Greenhouse and terrarium automation
- Indoor air quality monitoring
Package Contents
- 1× Humidity and Temperature Sensor Module (DHT22-based)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
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