Thanx to everybody that contributed to the Thread. I got good ideas and the problem is solved. I think the main fixes were: 1) MOV's across the relay contacts 2) 6.2v zeiner across VCC to ground 3) .01uf caps at the LCD+, AVR power pins I also changed: 1) Removed the cap across the switch - no difference 2) Added diodes across the relay coils - no difference 3) I also left in the Int0 interrupt disable before switching the relays on. I tried changing the resistor on the Int0 but a lower value did not pull the VCC down far enough. I will try to post an updated schematic. JoeT
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Re: Relay Control
2004-02-16 by Joe
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