DHT22 - humidity and temperature sensor - breadboard friendly

This is DHT22 module, based on original AM2302 sensor. We have a bit cheaper modules built with DHT clone.

Specification:

Humidity sensor operating in the range of 5% - 99%, power supply 3-5V. The module has three leads, marked -, +, out. Accordingly, these are ground (GND), power supply and data bus. The sensor board already has a pull-up resistor, so you can connect the sensor directly to Arduino/ESP.

A special protocol is used on the data bus to read the measured values. There are many libraries available that support DHTxx sensors. You can recommend, for example, those from Adafruit, they work on both Arduino and ESP.

Due to how Adafruit has organized its libraries, you need to install 3 of them to work. Here is an example entry from platformio.ini:

lib_deps =
adafruit/Adafruit Unified Sensor@^1.1.15
adafruit/DHT sensor library@^1.4.6
adafruit/Adafruit DHT Unified@^1.0.0