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First public release of this open-source capacitive linear encoder.
What's in this release
- Sensor PCB: 3D STEP, fabrication files, assembly files, BOM and schematic.
- Not yet tested: I²C.
- Reflector PCB: 3D STEP fabrication files for a smaller testing-focused variant.
- 3D models: STEP and STL files for test fixturing.
- Firmware: build from source at this tag.
Status
Measured accuracy is about 40 µm at constant room temperature, against a Mitutoyo 543-793B-12 indicator. See Practical Accuracy Measurements.
This is a documented reference design from a personal project, not a supported product. See Status and Limitations before building one.
You'll need
KiCad 9 (to edit), PlatformIO, an SWD probe with a Tag-Connect TC2030 cable, a USB-serial adapter, and a 3D printer.
Get involved
Feedback and help are welcome, especially on the mechanical design. See CONTRIBUTING.md.
Licenses
Hardware: CERN-OHL-P-2.0 · Software and docs: MIT