What You Will Need
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Control Relays with the Nextion HMI and Arduino
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These are the basic items you will need to get started:
A Nextion HMI - for this tutorial I will be using a 4.3 inch Intelligent series
A microSD card that is no larger than 32GB and formatted as FAT32
An Arduino Nano Every - I recommend using the Nano Every because you can use 2 serial ports at the same time
A relay breakout board or a relay shield - for this tutorial I will be using the
The Nextion Editor - Download and install the latest one
The Arduino IDE