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I finished mounting the sensor again. This time I put it right up by the transmission, where I had the magnetic reed switch a few tries ago. I welded bold heads onto the driveshaft, and put the sensor so that they would pass by as it spun.
In the first test (down the street very slowly) it worked great. Then I pulled onto a bigger street and got up to about 45. When I looked down, I saw that the guino was reading half the actual speed. I figured that it might be the sensor not being able to pick up the bolt head flying past, so it might be sending just one signal out.
Then I realized that the datasheet said that it could switch up into the kilohertz range (if I remember correctly) so I looked in the config part of the guino, and... voila. There was a VSS microseconds setting, which was on 2.
I set it to 0, took another fast test drive, and it read correctly. Now I'll need to take a look at the speed when I am up to 60, to see if the guino can register that fast.
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