Relay Switch uC for Guitar Effects Bypass

For use with Relay Switch PCB or with your own custom pcb.

Firmware versions description:

3M-3RL: 3 momentary N.O.(normally open) clickless footswitch to drive up to 3 relay+LED individually.

2M-2RL-1O: 2 momentary N.O.(normally open) clickless footswitch to drive up to 2 relay+LED individually plus an optocoupler.
Optocoupler can be made with GL4537-1 ldr and green ultrabright LED.
Slight volume drop for a few milliseconds when engage it.

3NM-3RL: 3 latching footswitch to drive up to 3 relay+LED individually. Most silent.

3NM-2RL-1L: 3 latching footswitch (A, B, C) to drive up to 3 relay+LED (A, B) plus an additionary LED(C) to select between different routing options: A, B, A+B.

Detailed description of 3NM-2RL-1L:

If relay+led A and relay+led B are off, pressing footswitch A turns relay+led A on.

If relay+led A and relay+led B are off, pressing footswitch B turns relay+led B on.

If relay+led A is on, pressing footswitch B turns relay+led A off and relay+led B on.

If relay+led B is on, pressing footswitch A turns relay+led B off and relay+led A on.

If relay+led A (or relay+led B) is on, pressing footswitch C turns relay+led A, relay+led B and led C on.

If relay+led A and relay+led B are on, pressing footswitch C turns relay+led A, relay+led B and led C off.

If relay+led A and relay+led B are off, pressing footswitch C turns relay+led A, relay+led B and led C on.