I need some help.
I got an external power supply to drive a new heated bed on a robo 3d r1.
I made the assumption that I could drive a relay from the existing heated bed wiring, meaning that the wires that used to drive the old heater have been replaced with wires driving a relay, then the relay controls power to the new heater.
Unfortunately, it’s not working. I’ve gotten out the multimeter and found that the wires don’t seem to be getting power regardless of whether the heater should be on or not. MatterControl says the bed is heating, but no voltage is passing through the relay.
I’ve checked the wires, watched what videos I could find, but I can’t figure out why this isn’t working.
Can anybody help?
edit - I should add, I have the relay hooked up to D8.