scalerobotics , you have done excellent work again my friend!.

But you made me wonder ... (as I have already design the pcb of my ALTMTR) MUST I include a Crystal (20Mhz) after all or I can leave/ and rely on internal 8Mhz oscillator (12f683) with any drawbakcs of it?
May be I need to redesign my mcb and loose button activation option.
Or may be I use led indication both as input and / or output this will make me think.... )