Hi everyone, I am debugging a garbage-character LCD problem which only happens when the relay is turned on and drives a 1A/12V solenoid. Initially I thought maybe my custom-designed relay board was the problem, so I ordered a simple relay from eBay: http://www.ebay.com/itm/221162886568?ssPageName=…

Relay and back EMF

system April 29, 2013, 9:01am 17

Why not use an optoisolator ?

or was that ruled out?