One other question (this may seem a little daft) will 2mm thick copper work as a touch sensor? The dimensions of each key is 15mm by 50mm, and there's 8 altogether with them going into the C1 - C8 pins so will this still be okay? All the demos I see of it online just use fruit!
Thanks!! It's just more for piece of mind I think, project deadline is this coming wednesday and I dont get the part until tomorrow so I just needed a bit of reassurance that it could work just in case I had to explore other possibilities before finishing.
Even if you can't read the led-states with the arduino, you can still use I²C or SPI communication as that's what you are supposed to do with this module.