Z-probe with optical switch and Op-amp comparator

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An z-probe which uses and optical switch and op-amp comparator for better trigger precision. The op-amp is an UA741CN powered from a 5V source.The metalic pin used in this probe is a nail (70mmx3mm) cut to required size.The neodymium magnet is taken from an dvd drive (the optical head)The spring is taken from an ball pen.To add the electronics components i used a small perfboard. Having a polished and correct trimmed head on metal pin is essential for accuracy. On my probe, without too much fiddling: Mean: -0.017500 Min: -0.029 Max: -0.006 Range: 0.023 Standard Deviation: 0.008385 04.01.2019 update I created a proper PCB for the z-probe. I added a led to show when the probe is active.

Author:
stinguc

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