John OpsahlThe current material cost estimate for a single OpenDendrometer v0.1 is $50 USD. See cost breakdown by component in the table below. The two highest cost items are the lithium battery and the enclosure at around $7.75 each. $50 falls right in the middle of the "shall" requirement of $60 and "should" requirement of $40 that were established at the beginning of this project. Overall, I am excited to have achieved the original design requirements and look forward to exploring strategies to further reduce material cost.
For more a more detailed breakdown on these costs and information on where these components can be sourced from, see the "eBOM" spreadsheet of the "OpenDendrometer_EN" workbook in the files section of this project.
| Qty | Description | Cost Per Unit | Total Cost |
| 1 | digital tire tread depth gauge | $4.27 | $4.27 |
| 1 | Arduino Pro Mini, 3V/8MH | $2.12 | $2.12 |
| 1 | lithium battery, 2000mAh | $7.67 | $7.67 |
| 1 | micro SD card module | $0.38 | $0.38 |
| 1 | micro SD card, 16GB HC | $1.99 | $1.99 |
| 1 | RTC module, DS3231 | $3.75 | $3.75 |
| 1 | coin cell battery, 2032 | $0.61 | $0.61 |
| 1 | logic level shifter, 4 channel | $0.30 | $0.30 |
| 1 | mosfet, 2N7000 | $0.14 | $0.14 |
| 1 | Bluetooth BLE module, AT-09 | $4.05 | $4.05 |
| 1 | OpenDendrometer PCB | $4.00 | $4.00 |
| 2 | 6 position header connector 2.54mm, through hole, right angle | $0.66 | $1.32 |
| 1 | JST B2B-PH-K, 2mm spacing,1 row, 2 contacts | $0.01 | $0.01 |
| 1 | OpenDendrometer laser cut parts, baltic birch plywood, 3.18mm | $4.00 | $4.00 |
| 1 | electronics enclosure, 158x90x60 | $7.84 | $7.84 |
| 1 | shaft collar, 1.6mm shaft | $1.68 | $1.68 |
| 1 | aluminum angle, 25x25mm, 1.6mm thick, 130mm long | $2.50 | $2.50 |
| 4 | nut, M5, stainless | $0.06 | $0.23 |
| 2 | threaded rod, M5, stainless, 100mm | $1.50 | $3.00 |
| Total | $49.85 |
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