Bill of Materials
Below you will find a detailed accounting of the components used to construct my little fabrication, should you care to attempt design of a similar device of your own.
Purchased Structural and Decorative Components
| Item | Cost | Count* | Total |
|---|---|---|---|
| Model train | $10.00 | 1 | $10.00 |
| Brass lamp shade | $2.00 | 1 | $2.00 |
| Brass candle holder | $1.00 | 1 | $1.00 |
| Faux leather box | $1.50 | 1 | $1.50 |
| Stick-on wood panel | $1.50 | 1 | $1.50 |
| Masonite sheet (1/4" thick) | $9 | 1 | $9.00 |
| Roll of stretch tape | $3 | 1 | $3.00 |
| Heavy-Duty Velcro | $3.50 | 1 | $3.50 |
| Aluminum Rod | $1.25 | 1 | $1.25 |
| Polyethylene Tubing | $0.75 | 1 | $0.75 |
| Fasteners (nuts, bolts, washers) | Variable | Assorted | $7.00 |
| Total | $42.50 | ||
Purchased Sensory and Drivetrain Components
| Item | Cost | Count* | Total |
|---|---|---|---|
| Maxon motor | Donated | 2 | Donated |
| 7.2 volt battery pack | $13.00 | 2 | $26.00 |
| Spider coupling | $2.50 | 2 | $5.00 |
| Infrared tape sensor | $2.00 | 4 | $8.00 |
| Limit switches | $3 | 4 | $12.00 |
| Motor driver board | $9.50 | 2 | $19.00 |
| Resistors and capacitors | Variable | Assorted | $7.00 |
| Molex connectors and wire | Variable | Assorted | $5.00 |
| Total | $82.00 | ||
Already available Laboratory Kit Components
| Item | Count* |
|---|---|
| LM324 operational amp | 2 |
| LM339 comparator | 1 |
| LM7805 voltage regulator | 1 |
| LM7605 voltage regulator | 2 |
| Red light-emitting diode | 3 |
| Photo transistor | 2 |
*As a side note, I am personally acquainted with several esteemed Counts, including Matthew of Ohline, Karl of Gumerlock Woods and Paul of the Very Long Day, but none of them is referenced in this accounting.