Matrixpad

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Projects
Matrixpad.jpg
Participants Brainsmoke
Skills PCB Design, Electronics, Hardware debugging
Status Finished
Niche Electronics
Purpose Infrastructure

Capacitive Touch Matrix Numpad For an Atmega328p

BOM

Item 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