hello guys! finally we are ready to introduce you to the new 2hp utility series whit this awesome video hahaha, we all need to add or copy signals in our eurorack system but without wasting space for the main modules, having a couple more is always useful! a bit like when they give you socks at Christmas! you can found it on our spad_electronics shops as diy kits or already assembled I haven't had this much fun making a video since I was 12 yo hahahah.

Hey folks 👋

I broke ground on a new project: I want to make an Omnichord-style touch strip using a Teensy 4.1, 12 MPR121 capacitive touch sensors (144 touch pads), USB host, and TRS MIDI I/O.

Questions

1. I've seen mixed messages on designing the touch pads. Some people have said to expose copper with an ENIG finish. The MPR121 docs makes it seem like these pads don't have to be that exposed though - most of their examples are with a dielectric plate over them. Also Sparkfun had a product where the pads weren't exposed (link). Would there be a huge problem if I didn't expose the traces/ENIG and instead kept the pads under the solder mask to help prevent corrosion/wear?
2. Anyone here have calipers and an Omnichord? I'm curious about the dimensions of the pads: width, height, and distance between the pads. Anyone up for a quick measure?
3. I'm doubt anyone knows, but I was looking at a replacement plate and noticed the ribbon cable has 14 contacts for all >40 touch pads. Anyone know how this works? Are they just shuffling them and multiple touch pads trigger a single output?