> Dewd!  I have been wanting to build a metronome for a while!  Keep me
> posted on how you are doing and I will be glad to pitch in a hand.  I
> would love to build one myself.

Well, the metronome part is not too hard using the compare module and corresponding interrupt, and a lookup table (or eeprom, or math) is easily written with the right delay values to convert bpm into a 'knightrider' led display. The tick also follows from that. But, as you said, there are many ways to do this.
The 'problem' is in the tuning fork feature, which I am making too hard perhaps. I don't like listening to square waves so I  thought of a 1 bit D/A converter using the USART and an audio power opamp integrator (hmm nice thing). But then I need to have an iterrupt at a multiple of 440 Hz, increasing my frequency error...

Perhaps I should stick with a square wave, like you suggested...

> I am thinking the interrupt method would be a better
> design, though.
I agree :o)

> A straightforward user interface is a Scott Edwards serial LCD and a
> couple of buttons.  And a speaker of course.  A large diameter piezo
> driven by a transistor is all that is needed.  Geez the thing is almost
> designed already.

hmm.. an LCD would be nice indeed if i'm stuffing it with not-so-often used features...

Thank you for helping me think :o)

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