How to connect the Magnetic Sensor with arduino for my Tachometer Project

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I am sorry for what I have commented above without reading properly.. :zipper_mouth_face:

But i am lucky to have guidance from a gentleman like you who is taking his precious time out to make me understand things instead of ignoring a novice .. :slight_smile:

The link which you have given me at very first i had that for a long time..

http://www.sportdevices.com/rpm_readings/index.htm

I used the first circuit there 2 years back to make a RPM meter for my motorcycle..

But in that circuit I did only use till the BC547 transistor and connected the output from the transistor to the interrupt pin of arduino and eliminated the 555 timer..

Everything worked fine, only problem used to be is sometimes High Voltage pulses used to reset the arduino and hang it..

So that is the reason I am thinking of using an op-amp to solve it and have a better input on the interrupt pin to have more accuracy..

I am reading all the links given by you and post my problems/questions..