DHT21 / AM2301 Temperature & Humidity Sensor

AM2301 ( DHT 21 / AM 2301 ) Capacitive Digital Temperature & Humidity Sensor sensor is one of the commonest from the range of DHT temperature sensors. It boasts a relatively high-temperature measurement accuracy of 0.5°C in 0.1°C steps with a relative humidity accuracy of ± 3%.

It has only 3 wires, including power and ground, meaning only one digital pin is required to interface it to a microcontroller.

Specifications:

• Power supply: 3.3-5V DC
• Output signal: digital signal via single-bus
• Sensing element: Polymer humidity capacitor
• Measuring range: humidity 0-100%RH, temperature -40~80Celsius
• Humidity hysteresis: +-0.3%RH
• Long-term Stability: +-0.5%RH/year
• Sensing period: Average: 2s
• Dimensions size: 59*27*13.5mm