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Reply to "Need Timer and Dual Relay Circuit Design Help"

quote:
Originally posted by Gary E:

If you really would like total solid state I can give you PIC to do that function.


Wow! Are you offering to write the code and send him a programmed part? And by total solid-state are you having the PIC drive triacs (instead of relays) for AC switching?


If size matters, and you're willing to do some assembly, then a PIC with a handful of external parts would be the most compact solution. All parts would fit on a board, say, 1" on a side if total solid-state, and maybe 2" on a side if relays.

Something to double-check before committing to a specific component-level timing circuit are the start-up and "don't do that" cases. Some timer circuits immediately start a cycle when first turned on. Probably a don't care. Can the loader and unloader run at the same time? Maybe your power supply is limited and doesn't like that. Is it OK for a new Load cycle to start if the kid presses the button while the Unload cycle is still running?

Not trying to over-complicate matters but whether using modules, discrete components, or a PIC, I think measure-twice, cut-once applies here.

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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