In another post, I pictured a house thermostat that I built to control my oil fired furness. The prop monitors the temperature in the house, and when the temperature drops below the set temp, the furness turns on until the set temperature is reached. At this point a relay on the board will open a single contact (a SPST relay) and turn off the furness. Now the problem is...at the point of shutdown, the propeller will reset and go back to the COG 0 page, which indicates "POWER FAILURE" and sit there, until I push a reset button to get things going again.
The 12 volt control relay, mentioned above, is controlled by a optoisolator, so the relay is isolated from the Propeller. The contacts of the relay, are opening and closing only 24 volts AC. Which turns on and off the 24 volt relay in the furness. I fear there is some sort of inductive spike taking place in the wires to the relay, which is mounted on the PCB.
I am wondering if anyone else has had this problem with something that they built. I have turned on and off alot of stuff with STAMPS and PROPS, and never had this problem. Also, I should add that I do have alot of filtering capacitors on the supply voltage to the PCB.