In order to use the ESP-01 Wi-Fi relay module, a programmer/programming adapter is required to program the ESP-01 module (see below). Also it is pretty easy to make your own programmer, or you can ...

The Arduino acts as the brains of the operation while an off-the-shelf NFC/RFID reader module is used to read ... the Arduino triggers a relay which can then be used to control just about anything.

If you are designing your own intelligent “Graden Computer” with an optional digital plant moisture sensor/water pump controller that lights an LED to alert the user when it is time to water a potted ...