pcb encoder
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This $32 Open-Source PCB Encoder Measures Position to 40 µm Using the Same Trick as Your Digital Calipers Cheap digital calipers hide a clever capacitive encoder inside, and Nick Steele (nichlock) has turned that idea into an open-source linear scale you can build yourself. It is just two PCBs, a sensor board with an STM32L4 and a passive copper "reflector" strip, sliding about 0.1 mm apart. The maker rates it at 40 µm accuracy against a Mitutoyo digital indicator, and the build costs roughly $32… |
