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== Capacitive Touch Matrix Numpad For an Atmega328p == == BOM == {| class="wikitable" |- ! scope="col"| Item ! scope="col"| Quantity |- | PCB | 1 |- | ATMEGA328P-AU | 1 |- | 10KΩ 0603 SMD resistor | 1 |- | 4.7KΩ 0603 SMD resistor | 7 |- | 470KΩ 0603 SMD resistor | 3 |- | 1μF 0603 SMD capacitor | 1 |- | 100nF 0603 SMD capacitor | 1 |- | 4.7nF 0603 SMD capacitor | 3 |- | 4 pin header .1" | 1 |- | 3x2 pin header .1" (for ISP programming) | 1 |} == Github repository == https://github.com/techinc/matrixpad == Technical Background == - Excellent technical description: http://sensi.org/~svo/capsensor/index.en.html - QMatrix Whitepaper: http://www.atmel.com/dyn/resources/prod_documents/qmatrix_white_paper_100.pdf == PCB Design guidelines == - Moisture Tolerant QTouch Design: http://www.atmel.com/images/doc42017.pdf - QTouch Schematic and Layout Checklist: http://www.atmel.com/Images/Atmel-42094-QTouch-Schematic-and-Layout-Checklist_Application-Note_AT02259.pdf == Photos == <gallery heights=240px widths=320px> File:Matrixpad.jpg File:Shinies.jpg File:Matrixpad-back.jpg </gallery>
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