Description

DHT22 Temperature and Humidity Sensor Module

DHT22 (AM2302) – Humidity and Temperature Sensor is a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn’t require extra components so you can get right to measuring relative humidity and temperature.

Features:

3.3-5V Input
1-1.5mA measuring current
40-50 uA standby current
Humidity from 0-100% RH
-20 – 80 degrees C temperature range
+-2% RH accuracy
+-0.5 degrees C
Pin Mapping (When the Sensor is kept facing you, left most pin is Pin 1)
VDD power supply (3.5-5.5V)
SDA serial data – bidirectional
NC NC
GND

Pin Identification:

No:	Pin Name	Description
For DHT22 Sensor
1	Vcc	Power supply 3.5V to 5.5V
2	Data	Outputs both Temperature and Humidity through serial Data
3	NC	No Connection and hence not used
4	Ground	Connected to the ground of the circuit
For DHT22 Module
1	Vcc	Power supply 3.5V to 5.5V
2	Data	Outputs both Temperature and Humidity through serial Data
3	Ground	Connected to the ground of the circuit