Hall Sensors are easier to adjust since the distance between sensor and magnet is not critical.
The Digital Hall Sensor device is a small integrated circuit, which has just two states, ‘On’ and ‘Off’.
Unipolar in its action, only requires a single magnetic South Pole (Hall Sensor face with writing on) to both operate and release them as they move in and out of the magnetic field.
The rear side can be activated with a North Pole magnet.
The IC contains a Hall Sensor that detects the magnetic field, a high gain amplifier and a Schmitt trigger to provide hysteresis.
When a magnet is passing the Hall Sensor, it will exceed the pre-set value of the output from the device to switch quickly between its ‘On’ condition to an ‘Off’ condition, without any type of contact bounce.
The A3144 Hall Sensor device cannot directly switch large electrical loads as the output drive capability is only 25 mA. For large current loads an open-collector NPN or PNP Transistor can be added to increase the output.
When the device detects a magnetic field, the output voltage switches from supply voltage potential to ground potential, providing the correct input for a device, for example on a decoder, sound card, or to a Feedback Module.
Bottom two were salvaged from a previous project, and repurposed for testing the connection to the Feedback Module.
Test rig to test correct operation of the Hall Sensor.
Further testing with the Servo Tester Modified, correct operation, per activation of the Hall Sensor.
LGB Switch decoder, Address 28, connected to a Relay.
Hall Sensor activated on 1A, sends request to the LGB Switch decoder on Address 28, turn Relay ON.
Hall Sensor activated on 2A, sends request to the LGB Switch decoder on Address 28, turn Relay OFF
Further testing, and some form of protective cover to either 3D print, or encapsulate in Resin, for durability for an outside environment.