“For our first controllable device, we will use an Arduino
Nano connected to a relay module and another HC-12 Module to receive the radio data from our ESP32 Hub. Once again, these parts are very cheaply obtainable from Amazon and eBay and the whole node can be built for well under 10 dollars from the right sellers.
The diagram shows the components and connections we will be using. An example use of this kind of setup could be to control a garage door opener, an outdoor light or heater.
- Arduino Nano (or clone)
- HC-12 Module
- Relay Module
- Female to Female Dupont Wires
- Mini USB cable (or micro depending on the board)”