Initial Design Concept
- The heart builds the pretty need XIAO ESP32S with lots of processing power, BLE, WLAN interfaces as well as a modern USB-C connection. It includes an battery management part avoiding extra PCBs.
- The detection principle of the 6D motion will be done with 6 linear HALL sensors measureing the displacement of the neodyn magnets mounted at the knob.
- Adding an IMU in the knobn might increase the stability (using a Kalman filter to fuse the signals) and could be used to wake up the device when it is in sleep mode (which would be mandatory for battery operation).
Rough estimate of cost (09/2023)
| What | Exact Part | cost full |
cost low budget |
source/link |
|---|---|---|---|---|
| uC | ESP32S | $7.49 | $7.49 | seedstudio |
| battery | LiPo 3.7V 650mAH | 2.60€ | - | ALioExpress |
| switch | ||||
| hall sensors | 49E SS49E OH49E (6x) | AliExpress | ||
| magnets | ||||
| buttons | 2x | 0.50€ | 0.50€ | ALiExpress |
| springs | 25x6 (3x) | 2,40€ | 2,40€ | AliExpress |
| cables | - | $ | $ | depends on your patience |
| 3D housing | - | $ | $ | depends on your patience |
| shipping | - | $ | $ | depends on your patience |
| working hours | 1000h+ | 0 | 0 | good that thigs is free ! |
| sum | - | <20€ | <15€ | - |
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