V4.0 Schematic Drawing. ... In order to use the ESP-01 Wi-Fi relay module, ... Also it is pretty easy to make your own programmer, or you can program the ESP-01 module with the help of the Arduino IDE ...

The hardware is consists of an Arduino microcontroller (here an Arduino Uno R3) and a pre-wired soil moisture sensor module. The soil moisture sensor module , built around the LM393 comparator, gives ...