He built this set of no-contact limit switches using a hall effect sensor. The small black package sticking out past the end of the protoboard is the sensor. It is used to detect a magnetic field.

Magnetic Hall effect keyboards are taking over the market - here's what they do and whether you should be taking note.

Lemokey's latest 75% gaming keyboard comes with Hall Effect switches and an 8,000Hz polling rateThe Latest Tech News, ...

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 ...

The market for hall-effect current sensors market is anticipated to reach USD 1128.0 million in 2022 and increase to USD 2765.0 million between 2022 and 2032 at a CAGR of 9.4%. Consumer electronics, ...

Each magnetic switch has a magnet inside it, which, when the key is pressed, triggers a change in the Hall effect sensor present either in the lower part of the switch or on the PCB. This action ...

There is easy access to the function and arrow keys and each key has a south-facing LED that illuminates the keyboard with ...

The Nuphy Field75 HE sports a neat futuristic design with plenty of macro keys and Hall Effect features for top-notch ...

In short, a Hall effect keyboard uses magnetic switches instead of the traditional ... This travels down the switch as it’s pressed, its distance from a sensor in the PCB of a keyboard ...