Hey all, after seeing this (http://das-labor.org/wiki/Stimmmopped/en), I
wanted to make my own very simple guitar tuner.

My schematic: http://postimage.org/image/32mp0tnpg/

- The chip in the middle is a PIC16F886, surface mount.
- The six LEDs on the left indicate which string is selected (E, A, D, G, B=
,
e). Small, surface mount, low power.
- The four LEDs on the right are used to shine light at various pulse
frequencies on the strings. High brightness, through hole.
- The push button switch selects the string.
- The toggle switch turns the power on and off.
- An ICSP header is placed somewhere on the board.

- The circuit is intended to be powered off of a few parallel 3V coin cells=
..



1. If the circuit is designed to run at 3V, how will programming be done by
the PICKIT2? The PICKIT2 runs on 5V as far as I remember, but I think it
should have an option to program at 3V, but I don't remember, been a while
since I used it.

2. The PIC16F886 datasheet says that the PIC can be run at 20MHz. Since I'm
tuning strings which I don't think divide nicely to those frequencies, I
want to run the PIC as fast as possible to minimize the error. Therefore,
I'm going to be using a 20MHz crystal. The datasheet schematic shows the
crystal with capacitors. What should the values of these capacitors be?

3. I didn't look much into it, but I use the 16F886 as a "jellybean" part.
It's cheap, available, small, and loads of features. I think the timers on
there should be adequate for the oscillation of the pins. How would you guy=
s
recommend generating the right frequences for the LEDs? Timers?
--=20
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