hi, I have a 4 channel relay and I want to use it for switching with arduino uno. I have written a code for it which is as under #define reone 7 //relay no. 1 #define retwo 6 #define rethree 5 #define refour 4 #define sone A2 // switch no. 1 #define stwo A3 #define sthree A4 #define sfour A5 int va…

4 channel relay with 4 buttons

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