This is a very popular, ultra low cost digital temperature and humidity sensor. It uses a capacitive humidity sensor, and a thermostat to measure the surrounding air temperature. The result is available via a digital signal on the data pin (no analog input pins needed). It's fairly simple to use, but requires careful timing to grab data. The only real downside of this sensor is you can only get new data from it once every 2 seconds. But, for most applications this is not an issue at all.

Technical specification:

· Can detect surrounding environment of the humidity and temperature

· DHT11 sensor adopts

· Humidity measurement range: 20% ~95%

· Humidity measurement error: ±5%

· Temperature measurement range: 0℃~50℃

· Temperature measurement error: ±2 ℃

· Operating voltage:3.3 V~5 V

· Output form: digital

· Has fixed bolt hole and easy installation

· PCB Dimension: 32 mm * 14

1 can detect ambient humidity and temperature2 sensor DHT113 humidity measuring range: 20% -95% (range 0 degrees -50 degrees) and humidity measurement error: + - 5%4 temperature measuring range: 0 degrees -50 degrees temperature measurement error: + - 2 degrees4 Operating Voltage 3.3V-5V5 Output Type Digital Output6 has a fixed bolt hole for easy installation7 small plates PCB size: 3.2cm * 1.4cm8 Power indicator (red)9 Each weighs about 8g Two module interface specification (3-wire)1 VCC 3.3V-5V external2 GND External GND

3 DO small