Question 1: What would be the best way to connect 20, 30, .. sensors to one Arduino?
Question 2: Is there possibility to somehow connect 24V sensors, without using 4N25 optocoupler?
Question 2: Can i connect 5 Arduino to 1 via WIFI modules?
Why WeMOS? I see it has much higher frequency and build in WiFi. Is there any other difference which is more good for this project?
Do you have any suggestion what to use for ger 5 or 3V signals from 24V if not 4N25?
am doing it right?
I already started to design circuit board. I will post updates after I receive PCB and other material from eBay.
Is diagram in attached photo ok?
Do you think you are really at the stage of getting a PCB made?