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Message

Re: Relay Control

2004-02-16 by Joe

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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