vehicle speed sensor questions

[mycarsucks]

How accurate is this sensor? Anyone know where i can get some detailed information?

I was thinking that if it was very accurate, and has a fast enough refresh time ( would think they are constant), i could make a program that woudl essentially be the same thing as a g-tech pro using about $5 in materials.

 

[Rollin]

Try over in the trans section...I'll move it over there for ya

 

[MeanBuicks]

One problem you'll face using velocity & time for calculations would be tire spin. If the speedometer runs up to 70 mph for about 2 seconds at the beginning of a test, how will your device figure out how far the vehicle has actually travelled?

The G-tech can get away with tire spin because it's monitoring acceleration and time. When tire spin occurs, you reduce forward acceleration, and the proper speed and distance can be deduced.

 

[mycarsucks]

Well, in that case, are there any types of cheap accelerator sensors out there? i guess it would be a lot cooler if it could be a portable deal. It would be nice to have something like this in Wyoming for all of my friends, and it would be fun to say I actually made one.

Thanks
Ryan