Temperature Humidity Sensor (DHT21)

  • AMP-X210
€10,95
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For a simple climate system, an accuracy of one and a half to two degrees Celsius is acceptable. For example, if you grow orchids or collect smart terrarium. Sometimes there are projects that need accuracy up to a tenth of a degree. For such projects, this DHT-21 temperature and humidity sensor is for you.

This humidity and temperature sensor uses a single wire as a digital signal. This means you can transfer data up to twenty meters.

The module is based on the popular DHT22 sensor. The sensing element is hidden in a protective case. The device already has all the necessary wiring; the module operates with a voltage of 3 to 5 volts. All you have to do is connect it to your control board like any simple Troyka module.

The sensor works according to its own protocol. To simplify working with it, we packed all the necessary functions into the ready-made TroykaDHT21

Connection

The module is connected to the control electronics with its own 3-wire jumper cable. Pinout is similar to other Troyka modules:

  • Signal wire (S) - connect to the digital input of the microcontroller
  • Power (V) - connect to the power of the microcontroller
  • Ground (G) - connect to ground

When connected to an Arduino, a Troyka Shield or a low-profile Troyka LP Shield would be useful. If you want to use the module on a breadboard, use a pin header.

Specifications

  • Power Supply: 3-5 V
  • Current Draw for Data Request: 500 µA
  • Current Draw Idle: 15 μA
  • Temperature Range: -40 to +80 °C
  • Temperature Error: ± 0.5 °C
  • Humidity Range: 0–100%
  • Moisture Tolerance: ± 3%
  • Dimensions: 26.7 × 58.8 × 13.8 mm