Hall Effect Sensor A3144E (3144)

Hall Effect Sensor A3144E (3144) is a high-quality electronic component designed for Arduino, prototyping, and educational electronics. A Hall effect latch works like a switch. It will latch on when the magnet is near the sensor (south pole). It will turn off if the opposite magnet pole (north pole) is applied.
It can be used for counting rpm of rotating shaft or fan by putting 2 magnets with opposite poles after each others.
Features

3.5V to 24V DC operation voltage
Low current consumption
Temperature compensation
Wide operating voltage range
Open-Collector pre-driver
50mA maximum sinking output current
Reverse polarity protection

A3144 hall effect sensor datasheet.
A3144 hall effect sensor datailed tutorial to meaure fan rotaion RPM.
It’s perfect for DIY makers, students, and anyone building custom electronic circuits or STEM kits.