Nice PCB, sensor is marked as "3144", so its a (compatible) Allegro 3144 digital hall switch specified for up to 150°C and 4.5V to 28V supply voltage. Pinout is simple (like as shown in the allegro datasheet): - Gnd + Power supply (e.g. +5V) S Signal I added a 10kOhm pullup-resistor between (+) and (S)ignal and just tested at 5V and 3.3V with some small Neodym magnets (from CD-ROM drive pickups). => Sensor runs fine even at 3.3V! Output is an open collector logic, so "open" means no magnetic field, "0V" = "closed" means magnetic field nearby. But anyway: the signal LED incl. pre-resistor which is clearly shown in the BG product pic was missing on all of my 5 PCB.

Nice PCB, sensor is marked as "3144", so its a (compatible) Allegro 3144 digital hall switch specified for up to 150°C and 4.5V to 28V supply voltage. Pinout is simple (like as shown in the allegro datasheet): - Gnd + Power supply (e.g. +5V) S Signal I added a 10kOhm pullup-resistor between (+) and (S)ignal and just tested at 5V and 3.3V with some small Neodym magnets (from CD-ROM drive pickups). => Sensor runs fine even at 3.3V! Output is an open collector logic, so "open" means no magnetic field, "0V" = "closed" means magnetic field nearby. But anyway: the signal LED incl. pre-resistor which is clearly shown in the BG product pic was missing on all of my 5 PCB.

Nice PCB, sensor is marked as "3144", so its a (compatible) Allegro 3144 digital hall switch specified for up to 150°C and 4.5V to 28V supply voltage. Pinout is simple (like as shown in the allegro datasheet): - Gnd + Power supply (e.g. +5V) S Signal I added a 10kOhm pullup-resistor between (+) and (S)ignal and just tested at 5V and 3.3V with some small Neodym magnets (from CD-ROM drive pickups). => Sensor runs fine even at 3.3V! Output is an open collector logic, so "open" means no magnetic field, "0V" = "closed" means magnetic field nearby. But anyway: the signal LED incl. pre-resistor which is clearly shown in the BG product pic was missing on all of my 5 PCB.

C'est une sortie à collecteur ouvert il faut une résistance de triage au plus VCC (PullUp). Pas de brochage sur le site. Le - correspond à GND Le S correspond à la sortie (OUT) La borne du milieu est le VCC.

C'est une sortie à collecteur ouvert il faut une résistance de triage au plus VCC (PullUp). Pas de brochage sur le site. Le - correspond à GND Le S correspond à la sortie (OUT) La borne du milieu est le VCC.

C'est une sortie à collecteur ouvert il faut une résistance de triage au plus VCC (PullUp). Pas de brochage sur le site. Le - correspond à GND Le S correspond à la sortie (OUT) La borne du milieu est le VCC.