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Unread 12-01-2005, 16:32
scottm87 scottm87 is offline
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Re: Hall Effect Sensor.

Quote:
Originally Posted by seanwitte
Gyros measure angular velocity, not acceleration. The first integral of the velocity it the distance, so integrating a gyro provides angular distance, or relative heading.

Using a gyro to measure the robot's heading is pretty common with FIRST robots. The parts teams used last year are the Analog Devices ADXRS150EB and ADXRS300EB. The only difference is that the 150 can measure +- 150 degrees per second and the 300 measures up to 300 degrees per second.

Lots of posts describing how to do it.
Oops! You are right... With all the accelerometer discussion, I got all mixed up. The ADXRS sensors are nice, but you need to deal with the packaging. I think (not sure) the price limitations have been loosened enough that you can get an evaluation version of the accelerometer with some support circuitry brought out header pins that can be plugged into a board. This is much easier than dealing with a surface mount part, if you do decide to use it. Since there are more suppliers, it may also be possible to pick up other sensors now (the Memsic ones are also nice... and if it is allowed, you can buy it from Parallax pretty cheap.) Heh, you may even be able to get the old FIRST accelerometers from some supplier.
 


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