Weβre used to Hall effect devices as proximity sensors in mechanical systems, used to provide detection of something that has a magnet attached to it. However itβs easy to forget that the devices that provide a magnet-or-not digital output are only part of the story, and linear Hall effect devices provide a handy way to measure a static magnetic field. Itβs something [mircemk] demonstrates, withΒ an Arduino-powered magnetic field strength meterΒ that uses a UGN 3503U Hall effect device.
The circuit is extremely simple, comprising the sensor, an Arduino Nano, and an OLED display. This device is handy because its voltage output has a known relationship to the gauss level the sensor is experiencing, so while the accuracy of its calibration isnβt verified it can at least give a believable reading derived from the Arduinoβs ADC.
The whole is wrapped up in an attractive case that looks as though it has been made from PCB material, with the sensor protruding on what seems to be the shell of a plastic ballpoint pen. It makes a handy instrument that provides a useful function for not a lot of money, so whatβs not to like! Take a look at the video below the break for the full story.
Surprisingly such projects are few and far between here at Hackaday, howeverΒ itβs not the first magnetic field measurement weβve seen.
Source: A MAGNETIC FIELD STRENGTH METER USING AN ARDUINO