29 Sep '12, 9am

#followmejp RPM sensor and reading - Arduino Forum: #sougofollow

I am working on a project that i need to count rpm. I have found a few people doing this but not 100% satisfied with the code. It will be a rotating drum so all metal. Im not sure if i should put a magnet on it for hall effect or a strip for IR reflector. What does everything think is best or any other ideas. Also how to i read a hall effect sensor. I understand how to turn pins on and rear what a pin is getting but how to i read a pin over a period of time say for a second so i can count how many times the pin has gone high then low. So i understand digitalRead but this only reads once i need to read over a period of time.

Full article: http://arduino.cc/forum/index.php?topic=122889.0

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