DHT22 Temperature Sensor ( Pack of 25) - Buy Online in India

PACKAGE INCLUDES:

• 25 x DHT22 Temperature Sensor

SPECIFICATIONS:

• Datasheet

1. WHAT IS DHT22? HOW TO SET UP THE DHT22 TEMPERATURE SENSOR?

• The DHT22 Digital Temperature and Humidity Sensor Module AM2302 is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and spits out a digital signal on the data pin
  Simply connect the first pin on the left to 3-5V power, the second pin to your data input pin and the rightmost pin to ground. Although it uses a single-wire to send data it is not Dallas One Wire compatible! If you want multiple sensors, each one must have its own data pin.

2. WHAT IS DIFFERENCE BETWEEN DHT11 AND DHT22 SENSORS?

• Both units use a capacitive humidity sensor and a thermistor to measure the surrounding air, and output a digital signal on the data pin (no analog input pins needed), to be easily read by a microcontroller. They are basic and slow, but great for small scale projects that require basic data logging.
• The DHT11 is less precise, works in a smaller range of temperature/humidity, and is slightly slower, but also features a lower price point and a smaller form factor. If accuracy is important for your project, and you don't mind the higher price, go for the DHT22. Otherwise, the DHT11 should be good enough

3. WHAT IS THE WORKING PRINCIPLE OF DHT22 SENSOR?

• DHT22 sensor consists of a capacitive humidity sensing element and a thermistor for sensing temperature.  The humidity sensing capacitor has two electrodes with a moisture holding substrate as a dielectric between them. Change in the capacitance value occurs with the change in humidity levels. The IC measure, process this changed resistance values and change them into digital form.
  For measuring temperature this sensor uses a Negative Temperature coefficient thermistor, which causes a decrease in its resistance value with increase in temperature. To get larger resistance value even for the smallest change in temperature, this sensor is usually made up of semiconductor ceramics or polymers.

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