I’ve read on other posts that I should be able to use more than 8 section control relays… but the Nano only supports 8?
Do I configure a second nano to add more sections?
Nano can support more than 8 relays. Digital pins 3 - 13 are availiable for user output, analog pins A0 to A5 can be used as output as well. When more ports are needed there are other devices, Arduino Mega, ESPxx etc.
use an ESP32 (in Uno shape: “ESPDuino”) so you have more IN-Outputs and you may use it wireless
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use them the same way as the digital pins, but i think you can’t use a6, a7.