Parts List

1. wire kit and breadboard MicroStamp11, docking module, and serial cable Laptop with ICC11 compiler and PMS91 loader
2. two 7-segment LED display (LSD3221-11)
3. seven 100 k-ohm resistors
4. two 2n4401 transistors
5. two 5 k-ohm resistors
6. two 10 k-ohm resistor two buttons one LM660 quad op-amp IC two resistors ($R$) for op-amp buffer two 1n4007 diodes one 10 k-ohm trim potentiometer two additional resistors for diode clamp circuit one ULN2003 Darlington array driver IC one 74HC595 serial-to-parallel IC