Embedded Sensor – DHT11

Aosong DHT11 is a low cost humidity and temperature sensor with a single wire digital interface. The sensor includes a resistive sense of wet components and an NTC temperature measurement devices, and connected with a highperformance 8bit microcontroller. DHT11 uses a simplified single-bus communication. The sensor is calibrated and doesn’t require extra components so you can get right to measuring relative humidity and temperature.

           DHT11 output calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique and humidity sensing technology, assuring its reliability and stability. Its sensing elements are connected with 8-bit single-chip computer. Every sensor of this model is calibrated in accurate calibration chamber and the calibration-coefficient is saved in type of programmer in OTP memory, when the sensor is detecting, it will cite coefficient from memory. for more details about data sheet of DHT11 sensor click here.


DHT11 Pin Description

  1. VDD power supply 3.5~5.5V DC 
  2. DATA serial data, a single bus 
  3. NC, empty pin 
  4. GND ground, the negative power

DHT11 Dimensions

DHT11 Typical circuit

DHT11 Data format:

The 8bit humidity integer data + 8bit the Humidity decimal data +8 bit temperature integer data + 8bit fractional temperature data +8 bit parity bit.

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