Humidity and Temperature Sensor – DHT20
The DHT20 is a low-cost humidity and temperature sensor with an I2C digital output protocol. It can be applied to HVAC, dehumidifier, automatic control, data loggers, weather stations, and many other projects.
These sensors are calibrated and don’t require extra components, enabling you to get right into measuring relative humidity and temperature.
- Supply Voltage: 2.2-5.5V
- Communication: Standard I2C Protocol
- Humidity from 0-100% RH
- Typical accuracy: RH: ±3%, T: ±0.5℃
- Temperature range: -40 ~ -80 °C
DHT20 Pin Out:
- DHT20 (Datasheet)
- To avoid signal conflicts, the microprocessor (MCU) must only drive SDA and SCL at low level. An external pull-up resistor (for example: 4.7kΩ) is required to pull the signal to a high level. The pull-up resistor has been included in the I/O circuit of the DHT20 microprocessor
- The power supply voltage of the host MCU must be consistent with the sensor when the product is used in the circuit
- If you need to further improve the reliability of the system, you can control the sensor power supply
- When the sensor is just powered on, give priority to the sensor VDD power supply, SCL and SDA high level can be set after 5ms