Capacitive Touch Matrix Numpad For an Atmega328p

Files

• src/* source code
• pcb/* board & schematics

Technical Background

• Excellent technical description by Viacheslav Slavinsky:

  http://sensi.org/~svo/capsensor/index.en.html

• QMatrix Whitepaper:

  http://ww1.microchip.com/downloads/en/DeviceDoc/qmatrix_white_paper_100.pdf

PCB Design guidelines

• Moisture Tolerant QTouch Design:

  http://ww1.microchip.com/downloads/en/Appnotes/doc42017.pdf

• QTouch Schematic and Layout Checklist:

  http://ww1.microchip.com/downloads/en/Appnotes/Atmel-42094-QTouch-Schematic-and-Layout-Checklist_ApplicationNote_AT02259.pdf