Hi Guys A few years back I made this part of a circuit which worked well as a metal touch plate (ie. no moving parts button). It was not an analogue pin... I was timing the discharge of the capacitor via the resistor. The variable resistor must have been adjusted to what proved to be the best range to sense with my program. I am wondering if this is the best place to connect the touch plate. It worked well, but I don’t remember the physical situation ever changing, like using it outside of the same room. Maybe I was helping earth it? I don’t know if it would change the value of the capacitor to touch the other side of the resistor. I would like to have a go at a whole 16 key keypad with a micro that has 16 digital IO pins. any ideas appreciated. Cheers, Art.