What you need:
*Arduino Duemilanove
*a lot of 7-Segment-Display
*a lot of push Button
*a potentiometer
*8 x 120 Ohm resistor
*4 x 1k2 Ohm resistor
*2 x 1k Ohm resistor
*4 x BC547 Transistor
*1 x 74HC595
*breadboard
*wire
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Signing UpStep 17-Segment displaying with potentiometer
latchPin = 8; // pin 12 on the 74hc595
clockPin = 12; // pin 11 on the 74hc595
dataPin = 11; // pin 14 on the 74hc595
And you can download the Programm Code
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What about a 2 digit potentiometer controlled version?
http://www.ebay.com/itm/Arduino-UNO-2011-Version-ATMEGA328P-PU-AVR-MCU-Board-USB2-0-Cable-/180833433758?pt=LH_DefaultDomain_0&hash=item2a1a83389e
feel free to ask me anything..