Arduino Hall Effect Sensor A3144 Tutorial

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You can leave the resistor out and use INPUT_PULLUP.
In the follow up code of the tachometer, you use an ISR and a digital input, but I was wondering how it deals with bounces. I found the output of the 3144 pretty dirty, with multiple rises on a cycle.

lovemadeinjapan
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Thanks helped me out. Now my trains will be able to tell my computer where they are on the track!!!

kralcw
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How about using op amp comparator? Hall sensor is mostly used as measuring bldc motor's high speed. In my opinion, just pull up resistor is not enough to reduce the sensor noise effect on measuring high speed although low rpm measurement is not problematic. How do u think about my opinion when handling the measurement of bldc motor's high speed?

kaykwon
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Also, in my opinion, delay function should be discouraged.
Instead, by using timer, you can print out the result periodically.

kaykwon
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Cordial saludo.
¿Cuál es la función de la resistencia de 10Kohm?
con V=R*I entonces I=0.5mA y el sensor soporta hasta 0.25mA
De antemano, gracias por su valiosa atención y por aclarar mi inquietud.
Bendiciones de salud y tranquilidad.

jaimevillada