placement of your LCD with respect to your standalone processor
yea this probably part of the problem. Everything(12v power supply, mcu, lcd, outlets) is carefully stuffed into a two gang electrical box. In hindsight , probably not ideal.
what about those possibly generated by the load itself?
great point, but am unsure of how I would go about doing this. I just assumed that my 12v power supply was built well enough that it could handle reasonable fluctuations on its supply. On the other hand, it cost $2.50 off of ebay: http://www.ebay.com/itm/260990909977?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
. What techniques or approaches should I consider on this end.