DemCalc

Scientific calculator based on an atmega328P.,Features a 4x4 keypad, eight 7-seg. led displays and is powered by 2 AAA rechargeable batteries.visit my site for details: https://www.sites.google.com/site/demeterart/The calculator is based on an atmega328P (at 4MHz) and uses all available pins,16 for...
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[original story: Instructables]

Instructables 11 Oct 16:10