Gravity DHT22 Temperature and Humidity Sensor

This DFRobot Gravity module carries the calibrated temperature and humidity sensor DHT22 (AM2302). A capacitive humidity element and a temperature sensor are evaluated by an 8-bit microcontroller, the values are sent digitally over a single-wire line. The line to the microcontroller may be up to 20 m long. The cable is intended for the analog Gravity connectors of the IO Expansion Shield, the analog inputs of the Arduino are then used as digital pins.

For new projects with I2C, DFRobot recommends sensors such as DHT20, AHT20 or SHT40, for example the Gravity AHT20 Temperature and Humidity Sensor.

Note: The connection cable can be converted to male pins with a Dupont cable M-M, so that it also fits an Arduino UNO.

Recommended Accessories:

• Dupont Cables M-M 10cm 20 Pieces
• Gravity IO Expansion Shield for Arduino V7.1

Features:

• DHT22 (AM2302) sensor, factory calibrated
• Temperature -40 °C to +80 °C, error below ±0.5 °C
• Humidity 0 to 100 % RH, error ±2 % RH
• Resolution 0.1 °C and 0.1 % RH
• Single-wire interface, line up to 20 m
• 3-pin Gravity connector: S, VCC, GND

Application Examples:

• Indoor climate and weather station
• Monitoring of greenhouse, terrarium or cellar
• Data logging in Arduino and ESP32 projects

Documentation:

• Wiki DFRobot SEN0137
• Example code for Arduino (DFRobot wiki)
• Schematic (PDF)
• Dimension drawing (PDF)
• Tutorial DHT22 on the ESP32 (DFRobot blog)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0137
• Sensor: DHT22 (AM2302)
• Supply: 5 V
• Output voltage: 0 to 3.3 V (DFRobot)
• Temperature: -40 °C to +80 °C, resolution 0.1 °C, error below ±0.5 °C
• Humidity: 0 to 100 % RH, resolution 0.1 % RH, error ±2 % RH
• Interface: single wire, digital
• Pins: S (signal), VCC, GND
• Dimensions: 38 × 20 × 9 mm
• Weight: 14 g

Scope of Delivery:

• 1× Gravity DHT22 temperature and humidity sensor
• 1× Gravity analog sensor cable 3-pin, PH2.0 to XH2.54