DHT11 – Humidity and Temperature Sensor for Arduino and Raspberry Pi B/B+/Raspberry Pi 2.

The four-pin device uses a 1-wire protocol. It’s a snap to connect to your project, requiring VCC, GND, and a pull-up resistor on the single data line. We’ve already seen it used on at least one project, and hope to see more of this little guy in your own hacks.

Specification:

• Dimension 28mm*12mm*10mm
  
• Main chip DHT11 humidity sensor
  
• Voltage: DC 5V
  
• Digital output
  
• Humidity Range: 20—90%RH
  
• Humidity  accuracy: ±5%RH
  
• Temperature range: 0—60℃
  
• Temperature accuracy: ±2℃
  
• Temperature and humidity measurements are a nice addition to many hobby projects.

Datasheet:

        akizukidenshi.com/download/ds/aosong/DHT11.pdf