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Aux 4 (pinrow opposite side of Ramps Power side) second pin top is input for sensor, second lowest pin is ground. Connect ground to drillbit and sensor pin to touchplate. Best would be a shielded cable (used an old keyboard cable, usb works the same). But as stated above the pinout might change to free the connector for lcd. Description also in estlcam. You have to enable the pin in estlcam also.