hi John,
If this was my project I would go for a small PIC, it would be ideal for this application.

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

 

Hi Eric,

I can see the appeal of a single chip solution,
plus of course if you arent much at programming, theres always plenty of people
to advise or even to offer their own solutions.

Myself i actually prefer making up small transistor assemblies using components.

For this i would probably make a simple square oscillator with a rotary switch
selecting the long intervals, and maybe an ordinary switch selecting the short
intervals, that 30 sec and 1 min, i think.

I realise that R-C timers are not especially accurate, but for this i think its
alright.

The buzzer relay driver could be driven from the changeover pulse, with a cap
to linger for a second or so.

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I was thinking of getting into PIC stuff, but other things keep distracting me.

John

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