An electronic vernier caliper teardown to the silicon level
The electronupdate blog reverse engineers some engineering calipers:
A common tool for precision mechanical design is the digital caliper. Accuracy of +/- 0.01 mm for only a few dollars. How is that possible?? Well, as always. photolithography. The assembly contains two circuit board with a set of driver and sensor fingers offset by a specific ratio.
On the flip side of the circuit board is an integrated circuit under the black epoxy blob. It drives out 8 identical signals which are spaced out in time. As each signal gets coupled back to the sensor (depending on the location of the encoder PCB) it sorts out how far it has traveled.
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