It’s something [mircemk] demonstrates, with an Arduino-powered magnetic field strength meter that uses a UGN 3503U Hall effect device. The circuit is extremely simple, comprising the sensor ...

This post is to share a few things I have learned about hall sensor e-bike throttles but is not intended ... Moreover, an output voltage less than 0.4V will be counted as a sensor open-circuit state ...

In a later inspection, I found that HW-484 is a universal circuit ... t build my own Arduino Gauss Meter yet. I just want to demo how the sensor works in principle. And now you can let your ideas grow ...

With a little help from an Arduino mega, however ... coils he got off of Taobao (the Chinese version of eBay), a hall effect sensor, and a handful of current regulation ICs.