This Arduino grow-op monitoring solution helps ... The board is an Uno and has an SD card shield with a DHT22 temperature sensor plus a soil moisture sensor. A photo diode is also used to ...

The Anavi Thermometer Development board is fully compatible with the Arduino IDE ... It comes with a built-in DHT22/AM2302 temperature and humidity sensor and has slots for a mini OLED display ...

Did you know about using saturated salt solutions to produce constant humidity levels for calibration? We didn’t. The eBay hacker favorite, the so-called DHT22 module, doesn’t fare all that ...