fwiw. If you don't want to program, then the arduino route is probably not for you. Sell it and buy a used ss24 or tr24 or a lor controller. you will be less frustrated and have a controller that is mostly plug and play.
From the detail of the 2a, it is a low level trigger
- 5V Low-level trigger module: 0-1.5VDC relay connect (ON), 2.5-5VDC relays disconnect (OFF)
the 8a is configurable so you can use both the same way which will make your sketch easier.
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