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| Buy List | |||
| 1 | Arduino Nano + breadboard | Nano +Screw Terminal Adapter Expansion Shield | $8.99 Amazon.com |
| 1 | UltraSonic Distance Detector | HC-SR04 | $3.95 Mouser.com |
| 1 | NPN Transistor | MPSA06 | $ .37 Mouser.com |
| 1 | 22K Resistor 1/4W | 71-CCF0722K0JKE36 | $ .10 Mouser.com |
| 1 | 12K Resistor 1/4W | 71-CMF5012K100FHEB | $ .10 Mouser.com |