Hello, i’ve been lurking on this forum for some time, but this is my first post, so please bear with my inexperience.
First of all, i’m not sure if this is the right forum for this question, apologies if it is not.
I have this old piece of equipment (a midi pedalboard, i’ll attach the circuit diagram), which is run by an old 8 bit microcomputer. All it does is read some switches, light some leds and send/receive midi data (serial data). I’d like to replace the micorcomputer with an arduino, but i’d like to do it in the least intrusive way, in case in the future i want to revert to the original circuit.
I dont have any experience with electronics, so i have several questions:
Could i just tap a wire to the microcomputer pins that control the leds and switches (ej, solder wires directly to the legs, and connect the to the arduino?
If this is the case, could i just disconnect maybe the power traces (vdd, vss) of the microcomputer, so it does not affect the circuit?
Or would the only option be to completely isolate the leds/switches from the old microcomputer (eg, cut all the traces to the micro) and connect them directly to the arduino?
In short, i’d like to know how to replace the microcomputer with the arduino cutting the least amount of traces in the pcb.
In the attached schematic the appropiate pins i’d like to control with the arduino are marked.
Any info will be apreciated, thank you very much : )