Suppress Back EMF from soleniods about air-assist

[dhempy]

Ok. I believe the solenoid relay problem is solved.
I put a diode on the solenoid, and it ran for 2 minutes without error. I removed the diode, and it showed garbage within a few seconds.
I repeated the experiment, but only waited 10 seconds before removing the diode, with similar results.
I then restarted it with no diode from the beginning, and it went to error almost immediately.
This is the same prototype board and software as was in place last Friday. The wiring to the solenoid is different in length and proximity, but not substantially.

1:26
The diode is labeled IN4001 - M10. I have no idea how diodes are coded...it was just a diode I had handy. Might be overkill or underrated...
1:28
This is particularly encouraging, as that means the relays can stay in the enclosure. That avoids another whole set of packaging/enclosure issues.