Simple Arduino program

This project was awarded to marc2turbo for $25 USD.

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Project Description

I am just looking for some lines of code for my project.
I need a tachometer on my exercise bike, and would like to use a magnet and 6 hall sensors.
The pedal with the magnet passes in front of the hall sensors that are connected to an arduino duemilanove.

The speed would have to be updated at least 3 times per second in a variable, and be negative if pedaling backwards
I am struggling for when the bike slows down, suddently stops, or goes backwards, so would like someone to write it for me
It does not have to be long,

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