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2 digit 7 segment 0-99 counting with arduino vary speed of counting from potentiometer

2 digit 7 segment 0-99 counting with arduino vary speed of counting from potentiometer.

470 ohm resistor for all 7 segment pin. 10 potentiometer connect to analog device.

for Arduino source code and demo video please visit :http://www.diymaker.com/arduino-controlled-7-segment-0-99-counting/