Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 5021
Posted: 09:09am 20 Oct 2021
+1 Option 1 has not enough terminals to put the pi to its potential. For a pic12f508 it is nice. Option 2 is dangerous. The pi with its not very robust io pins at 3.3v mounted on a din rail, next to power electroncs, openly, is asking for trouble. Whatever happens unexpectedly, the pi dies.
P.s. Gold plated relais are only marginally more expensive, and I use them a lot. They have a gold flash over robust contacts. This will make them usable in low current applications. But when a high current is applied, the gold vapourizes, and remins is a robust power contact. You only cant go back....;)
P.p.s look at Controlino, these guys make a nice control platform for industrial applications, around a simple arduino core. Lots of io. Only the mini, shares pwm and relay outputs, that is not very clever. But the others are very nice. Edited 2021-10-20 19:17 by Volhout