DHT22 Temperature and Humidity Sensor with Cable

The DHT22 temperature and humidity sensor is a versatile and cost-effective sensor used to measure ambient temperature and humidity for a wide range of applications. It is based on a digital signal output and can provide high-accuracy measurements with a resolution of 0.1 degrees Celsius for temperature and 0.1% for humidity. The sensor uses a capacitive humidity sensing element and a thermistor to measure the humidity and temperature respectively. The DHT22 sensor is also relatively low power and can operate on a voltage range of 3.3V to 5V, making it suitable for battery-powered projects. Additionally, the sensor comes with long-term stability and high reliability, this makes it a perfect choice for various applications such as HVAC, weather stations, and indoor air quality monitoring systems. So, in this tutorial we have decided to interface DHT22 with Arduino UNO and in the process we will let you know all the details, so without further ado let’s get right into it.

DHT11 Sensor is very much similar to DHT22 and we have used DHT11 sensor with many other microcontrollers to build applications like:

• Interfacing DHT11 Temperature and Humidity Sensor with Raspberry Pi
• MATLAB Data Logging, Analysis and Visualization: Plotting DHT11 Sensor readings on MATLAB
• Automatic AC Temperature Controller using Arduino, DHT11 and IR Blaster
• IoT Weather Station using NodeMCU: Monitoring Humidity, Temperature and Pressure over Internet

DHT22 Temperature and Humidity Sensor Module:

The DHT22 module has a total of 3 pins. And the DHT22 bare bone sensor has 4 pins. If we consider the module among three pins two of which are power pins, and one is a data pin. If we are looking at the 4-pin sensor the extra pin is a NC pin, and it has no functions. The pin diagram of both the module and the sensor is shown below.