Noise issue related to Curtis 1238

[mpipes]

Powered things up and much improved but still a little glitchy with the relays controlling the accessories.

After a little more investigation it looks like floating inputs on the Arduino. I have one of the Adafruit 5-pad capacitive touch sensors and the output leads from it, to the arduino input are 8ft long. Been so long since I set it up that I forget if I have the internal pull-ups enabled but I doubt it. Might need to add external resistors.

Fun stuff

[Stevo]

Resistors?
If a cable is 8 feet long, maybe a select capacitor on one end? Not sure.
I was thinking of the alarm signal from a Cellog to control a relay... especially if the wire is of significant length, a capacitor helps the signal stay stabilized.

[mpipes]

Unmounted the motor from the chassis but kept it connected to the controller, one last ground loop confirmed! The glitching went away with the motor pulled from the frame and controller powered up.

I had built the motor mount to be a tight fit but it's also pretty tough to wrangle into place. The insulation on one of the motor terminals got snarled up on a sharp edge during install so there was contact to the chassis.