2 digit 7 segment 0-99 counting with arduino

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/