Arduino for industrial automation

25$ arduino should not be trusted to do the same job as a 2500$ PLC

No chance there, the PLC costs that much for a reason.

However that's not to say that you couldn't harden an Arduino to be suitable and come up with something at a price point somewhere in between.

But in terms of getting that into a real industrial installation, no chance I would say, too many big boys have that market sown up.


Rob