Optical motion sensors
Sensors
To measure the position of the sphere we used two PCB boards based on the Avago Technologies ADNS-2610 [1] optical flow sensor and extracted from the Logitech M-SBF96 PS2 computer mouse [2]]. This sensor presents high reliability for speeds under 30.5 cm/s, and has a register that outputs the SQUAL value, a reference of the quality of the surface. This SQUAL value can be used for the calibration process.
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| Figure 1. Pinout of the ADNS-2610 |
The PCB and the lens are attached to a 3D printable structure which is assembled with 3 Thorlabs components.
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| Figure 2. Optical sensor |
Bill of materials (for each sensor)
| Component | Quantity | Supplier | Reference |
|---|---|---|---|
| Optical mouse | 1 | - | https://www.ebay.co.uk/itm/HP-PS2-Optical-Mouse-for-Desktops-Laptops-417966-001/272643457275?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 |
| Sensor holder | 1 | 3D printed part | STEP file, STL file |
| PH75_M | 1 | Thorlabs | |
| RA180_M | 1 | Thorlabs | |
| TR75V_M | 1 | Thorlabs | |
| M3 x 6 mm | 2 | RS Components | 137-720 RS PRO M3 x 6mm Hex Socket Set Screw Plain Stainless Steel |
| M3 threaded insert | 2 | RS Components | 278-534 RS PRO, M3 Brass Threaded Insert diameter 4mm Depth 4.78mm |
References
[1] https://media.digikey.com/pdf/Data%20Sheets/Avago%20PDFs/ADNS-2610.pdf