Description
The DHT22 Temperature & Humidity Sensor Module is a ready-to-use breakout board built around the DHT22 (AM2302) digital sensor. Unlike the bare 4-pin sensor, this module presents a convenient 3-pin interface (VCC, GND, DATA) and includes the essential external components—a pull-up resistor on the data line and a decoupling capacitor—already soldered onboard . This makes it immediately usable with Arduino, Raspberry Pi, ESP32, and other microcontrollers without additional circuitry. The module provides calibrated digital readings of temperature and relative humidity over a proprietary single-wire interface, offering a resolution of 0.1°C and 0.1% RH, with typical accuracy of ±0.5°C and ±2% RH . It is well-suited for environmental monitoring, weather stations, HVAC diagnostics, greenhouse control, and educational projects for both individual makers and business purchasers seeking a reliable, low-complexity sensing solution.
Features
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Integrated Pull-up Resistor and Filter Capacitor: The module includes the required pull-up resistor on the DATA line and a decoupling capacitor, eliminating the need for external components during prototyping or deployment .
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Three-Pin Plug-and-Play Interface: Standard VCC, GND, and DATA pins with 0.1-inch pitch headers allow direct connection to breadboards, jumper wires, and microcontroller boards .
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Factory-Calibrated Digital Output: Each sensor is individually calibrated, and the module outputs a fully processed digital signal—no analog conversion or user calibration is required .
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High Resolution and Accuracy: Provides 0.1°C temperature resolution and 0.1% RH humidity resolution, with typical accuracy of ±0.5°C and ±2% RH .
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Wide Operating Voltage Range: Functions from 3.3V to 5.5V, making it compatible with both 3.3V logic systems (ESP32, Raspberry Pi) and 5V systems (Arduino Uno) .
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Low Power Consumption: Suitable for battery-powered and energy-conscious applications, with low measuring and standby currents.
Technical Specifications
| Parameter | Specification |
|---|---|
| Operating Voltage | 3.3V to 5.5V DC |
| Temperature Range | -40°C to +80°C |
| Temperature Accuracy | ±0.5°C (typical) |
| Humidity Range | 0% to 99.9% RH |
| Humidity Accuracy | ±2% RH (typical, at 25°C) |
| Resolution | 0.1°C / 0.1% RH |
| Output Interface | Single-wire digital (proprietary protocol) |
| Minimum Sampling Interval | 2 seconds |
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