Switch simulator - bypassing pedal auto power-on state

[CA138]

Hi, I have a few Boss and other pedals (some analog, some digital) in my rack that annoyingly power up with the effect disabled.

I believe this solution is the least-intrusive way of solving that issue - it simulates a footswitch press after a short delay when powering up. I would have been happy to buy and install a few of these boards but the website/contact have been unresponsive.

Is anyone aware of a similar solution or DIY board that can do this? I have no experience with Arduino but could put it together and hook it up easily if pre-programmed.

 

[phi1]

That’s a cool idea. The circuit looks a bit odd to me, in that when the micro-sw pin is high and the physical switch is pressed (ground) the micro will be pushing out 50mA (5v / 100ohms). Whereas the datasheet says the max is 40mA per output pin. I wonder if that resistor could be increased without affecting the function.

Another way would be to replace the physical switch with a transistor, and re-route the physical switch to another micro input.


I don’t know if any off-the-Shelf solution but if you don’t find something I could help design it (either a fabbed pcb with smd chip like the example, or perfboard with a thru-hole chip if you have space.

 

[CA138]

That’s a cool idea. The circuit looks a bit odd to me, in that when the micro-sw pin is high and the physical switch is pressed (ground) the micro will be pushing out 50mA (5v / 100ohms). Whereas the datasheet says the max is 40mA per output pin. I wonder if that resistor could be increased without affecting the function.

Another way would be to replace the physical switch with a transistor, and re-route the physical switch to another micro input.


I don’t know if any off-the-Shelf solution but if you don’t find something I could help design it (either a fabbed pcb with smd chip like the example, or perfboard with a thru-hole chip if you have space.

Thanks so much for having a look. I don't want to impose on your time (or anyone else's), was just hoping someone may know of an existing product. It's such a niche use-case that I am guessing not.

Space wouldn't really be an issue - it would mainly be making a PCB and then programming the chip. I might put in on my project list to learn enough about Arduino to come up with something.