Need 4 modes with just 3 switches - need all modes to be selectable QUICKLY!

[HankMcSpank]

Oh my! Some pretty nasty self-imposed restrictions there Hank'.

There are smaller switches (see below, just left of the machined socket). And if you think about it, that tri-color LED actually has four states (off, red, green, and yellow).

Good luck on your project.

Hi Mike, yes, there maybe smaller switches out there, but I couldn't find them - in this scenraio the shaft of the switch needs to extend at least 7 mm vertically....to clear the case top & leave enough protuding for a finger to press on (& I'm not the one imposing the restrictions - it's the guitar that is ...the unit slides under the strings!)

Kamikaze47 - I'm using the PIC's own weak pullups internally (to save using pullup resistors externally) - so for all it looks to be, it's not a 'short' of 4.1V to ground through the diode when the switch is pressed, but a path as follows...

4.1V->PIC Internal Weak Pullup->Diode-> ground. (most of the voltage is dropped across the internal weak pullup)

(and not all the PIC's pins have weak pullups internally ...this was something else that imposed a restriction on me!)