AVR-Chat

----- Original Message ----- 
From: "OWEN-A" <oldboot@bigpond.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Tuesday, October 03, 2006 12:41 PM
Subject: RE: [AVR-Chat] Timer Counter


>I am trying to modifying a PIC program to get a shift register to work
> properly, toggle the clear pin on the shift register to force all outputs 
> to
> "0" to prevent it from holding the data for too long and burning out an
> expensive solenoid.
>
> The shift register is a 74HC595 and will occasionally lock an output on 
> for
> a long enough period to destroy a solenoid.
>
> These solenoids are $350-00 each and they burn out around 40 to 50 a year 
> on
> the system.
>
> Have tried a PIC group but have not received any replies.
>
> I normally use AVR's with a C compiler the more that I see of the PIC the
> more I dislike them!

Sounds like a problem with a transient on the supply. Something like an AVX 
TransGuard will cure the problem.

Leon