Auto Leveling with Proximity sensor
thingiverse
Proximity sensor is I used just 1K ohm resistor for adapt to RAMPS 5V. but good pull-down schematics is at the last image ! and this is from here:http://forums.reprap.org/addon.php?219,module=embed_images,url=http%3A%2F%2Fthingiverse-production.s3.amazonaws.com%2Frenders%2F32%2Fb2%2Ff0%2F54%2Fbd%2Fdiagram_preview_featured.jpg
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