Latching hall effect sensor for ESP32 grbl. This should provide 2.5v until the field latches and then drops to GND and the LED goes out. This is a bit of a hack so I can use cheap hall sensors that typically need 4.5v min voltage to operate. This works fine with a level shifter but the shifter adds many wires to the existing many wires... If the LED fails closed it it may cause issues with the non 5v tolerant GPIO of the ESP32 but this should be rare.
The RJ11 wires are yellow +5v, Green GND, red Signal
TODO: i need to build a mounting case for this and to get the correct 90 degree rj11 connectors.
|5||US1881 Hall Effect Sensor latching||VDU1,U1,U10||SIP-3P-2.54MM-TE||3|