【Verified】Hall switch

Hall switches can control the on-off of the output through the proximity and distance of magnets. Since the switches are controlled by magnetic force, there is no electrical connection between them, so that they can replace traditional physical switches in certain areas where wiring is impossible. It can also be used to a certain extent. Replaces physical switches.
 
The first application is as a limiter for mechanical structures, such as preventing magnets on one end and placing the module on the other end. The position is judged by the difference between the high and low levels of the module output near and far away. The second is to place it in the cabinet door or drawer, and place a magnet on the other end to open the door and activate the light installed inside the cabinet.
 
The chip uses AH3144, which controls the external output of the PNP transistor. The corresponding chip package is AH543, which can be replaced as needed. The circuit is simple and can be directly integrated into your own circuit. Note that this chip is a unipolar chip and only detects the proximity and distance of the S pole of the magnet. If necessary, it can be replaced with a bipolar chip from the same manufacturer. The following picture shows some chip information.