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GPL 3.0

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enstop hall effect5v to 3.3v logic

6 months ago 162
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Description

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.

Documents

a rj11 type 1 schematic

hall 5v to 3v logic endstop

rj11 type 2 connector schematic

rj11 type 1

rj11 type 2 connector voltage divider

5v to 3.2v hall effect sensor with voltage divider

test rj11 type 2 connector voltage

Sheet_1

BOM

ID Name Designator Footprint Quantity
1 4.7k VDR1 AXIAL-0.3 1
2 20k VDR2 AXIAL-0.3 1
3 47k VDR3 AXIAL-0.3 1
4 RJ11 VDRJ1-47K,RJ1 6P4C 2
5 US1881 Hall Effect Sensor latching VDU1,U1,U10 SIP-3P-2.54MM-TE 3
6 LED LED1 1206 1
7 10k R1,R10 AXIAL-0.3 2
8 DS1133-S40BPX RJ10 RJ11-1 1
9 LED10 LED10 1206 1

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