Hall's Application in Car Odometer

The car odometer can display the mileage of the car, which is based on the number of rotations of the wheels to indirectly derive the mileage. The number of wheel revolutions can be measured with a Hall sensor, which is an important part of the odometer. Its performance plays an extremely important role in the work of the whole circuit.
The magnet is attached to the iron and fixed at a certain position on the wheel. The Hall circuit is fixed on the frame. For each revolution of the wheel, the magnet passes through the Hall IC once and generates a pulse signal, and the counter counts the pulse.
Hall sensors commonly used in odometers are mostly bipolar latch Hall switch.

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Omnipolar Hall IC

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Method Of Detecting Switch Type Hall Sensor

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In the use of hall sensor for maintenance machinery, we will encounter holzer not working, from holzer's shape can not distinguish whether the holzer element is damaged, and how to detect whether the switch type of hall sensor is damaged. Taking Holzer YS282 as an example, the test method of switch type Holzer element is as follows: First, find a resistance R of 1K Omega, which is connected to the figure 1 and 3 feet, and connect the positive pole of the DC power of the 12V to the foot of the  switch type hall sensor YS282, and the anode is connected to the foot. The multimeter is placed in a DC 50V file, the red pen is connected to the foot, and the black pen is connected to the foot, and the pointer changes of the multimeter are observed. When the magnet N is very close to the test point of the hall sensor YS282, the pointer of the multimeter is deflected from the high level to the low level; when the N pole of the magnet is far away from the test point of the Holzer element Y
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How To Use Water Flow Sensor？

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