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.
Main chip DHT11 humidity sensor
Voltage: DC 5V
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.