The DHT22 (AM2302) is a digital temperature and humidity sensor with better range and accuracy than DHT11. It uses a single data wire and is supported by the DHT library on Arduino, ESP32 and ESP8266, making it a top choice for weather stations and IoT monitoring.
| Sensor | DHT22 / AM2302 |
|---|---|
| Temperature | -40 to +80 °C (±0.5 °C) |
| Humidity | 0 – 100% RH (±2–5%) |
| Supply voltage | 3.3V – 6V |
| Output | Single-wire digital |
| Sampling rate | 0.5 Hz (one reading every 2 s) |
What is the operating voltage?
3.3V – 6V.
DHT11 or DHT22?
DHT22 is more accurate and works below 0 °C; DHT11 is cheaper for basic room readings.
How often can I read it?
Once every 2 seconds.
Can I buy the DHT22 Digital Temperature and Humidity Sensor Module in Kanpur?
Yes – buy online with delivery across India, or pick it up from the iTechBuilders store, Damodar Nagar, Kanpur.
