Just to be clear your not talking about the relay coil. That is DC. Im a bit confused because you refer to it as an AC coil but the relay is DC and the solenoid on the water valve can not be altered. It is a sealed unit.
That one relies on the weight of water in the bowl, so it can't be used to fill a larger container.https://www.amazon.ca/Clucker-Automatic-Filling-Watering-Chickens/dp/B089XZVZMP/ref=asc_df_B089XZVZMP/?tag=googleshopc0c-20&linkCode=df0&hvadid=459548773611&hvpos=&hvnetw=g&hvrand=745007387889989801&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9001085&hvtargid=pla-934509365667&psc=1
You don't need both D4 and D5.
Thank you but I have already sent this out for a 5 board build. It was only $6 but if there are any issues I'll apply your suggestions.You don't need both D4 and D5.
D5 alone would be used to let the negative half of the AC past the LED to prevent the reverse voltage from destroying the LED. But D4 blocks any reverse voltage from getting to the LED, so there's no reverse current for D5 to carry.
Just use D4.
The same is true for D3 and D2.