hello everyone I'd like to make a small project that requires more than 30 touch input, a sort of touch keyboard. I only need to know if the input is pressed or not, I don't need a variable value. Since I'll make the pcb/soldering job on my own, I can only use a PDIP Atmega chip, like the one on Arduino UNO R3, but since I need lot of inputs, I will use something like 2 or 3 of those chips on the same pcb. That would cost less than every other dedicated "touch sensing" ic. Of course I will use ICSP for every chip to program them. My questions are: 1) is CapSense reliable enough for such application? 2) If I use the internal oscillator for those AVR that should only detect the touch, the CapSense would still work well? 3) if I don't use an external oscillator, can I still obtain reliable communication between the AVRs using the serial connection? 4) alternatives?
thank you Dimitri