The hardware is consists of an Arduino microcontroller (here an Arduino Uno R3) and a pre-wired soil ... apart from the module only a few external components are needed to build a relay-driver circuit ...

This Arduino Uno setup can be powered by a 6F22 9V battery or other suitable power source, but it is up to you. The next piece of hardware is a dual-channel, low-trigger, 5V relay module. This relay ...

The module is essentially a pair of potentiometers ... you can replace them with bigger LEDs or even a light bulb (paired with a relay for the Arduino Uno). Try a toggle switch instead, so ...

The WiFi version comes with an Espressif S3 WiFi module, that will help to expand creative opportunities for makers, educators, and hobbyists according to Arduino. The UNO R4 maintains the same form ...