Parts List

1. wire kit and breadboard
2. MicroStamp11, docking module, and serial cable
3. Laptop with ICC11 compiler and PMS91 loader
4. one 7-segment LED display (LSD3221-11)
5. seven 100 ohm resistors
6. two 10 k-ohm resistor
7. two buttons
8. one LM660 quad op-amp IC
9. two resistors ($R$) for op-amp buffer
10. two 1n4007 diodes
11. one 10 k-ohm trim potentiometer
12. two additional resistors for diode clamp circuit
13. one ULN2003 Darlington array driver IC one 74HC595 serial-to-parallel IC