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8. Force Sensor
A 5kg load cell and a 24bit ADC allow us to measure force against time.
| Component | Product Code | Approx Ex-VAT price | Link |
|---|---|---|---|
| Adafruit ESP Feather V2 | ADA5400 | £16.5 | Pimoroni |
| Adafruit NAU7802 | ADA4538 | £5 | Pimoroni |
| 5kg Strain Load Cell | ADA4541 | £3.5 | PiHut |
| 50mm JST SH cable | CAB1015 (Pimoroni) / 104220 (PiHut) | £1 | PiHut / Pimoroni |
| M2.5 3x10mm screw, 3x6mm screw, 6x nuts | 103126 (PiHut) / ADA3299 | £ | PiHut |
| 2 x 20mm M4 Screw | £ | ||
| 1 x M4 Eye Bolt | £ | ||
| 500mAh LiPo battery (Optional) | BAT0003 (Pimoroni) | £6 | Pimoroni |
Note both Pimoroni and PiHut have educational discounts available that can reduce these costs further.
- Navigate to the device page on Printables and download the model files (stl)
- Slice the stl files. I have had success printing with 0.20mm 'Layer Height' and 6 Top/ 4 Bottom 'Solid Layers'
- Suggested print order is shown left to right with the example prints below:
- The NAU7802 sensor will need the terminal block that comes with it soldering on
- Using two 6mm screws (and nuts) attach first the NAU7802 sensor to the PCB tray
- Insert the 50mm STEMMA QT cable into the NAU7802 sensor
- Using one 6mm screw (and nut) attach the ESP32 board to the tray (lower right corner) and insert the STEMMA QT cable from the NAU8702 sensor