memsic 2125 accelerometer

Badger

Hello

hey need to ask a question. I am building a robot that run on tracks. I have 2 motors running each track individually. Can the memsic detect if the robot is not running is a straight line. With code can I keep the robot from veering of course, or do I need a compass chip. Just need to know how to keep one motor running faster than the other when not avoiding an opject


Badger

Leon

Won't it be moving too slowly for an accelerometer to register anything? You could have encoders on each motor, and use those to keep it going in a straight line.

Leon

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Post Edited (Leon) : 12/14/2008 11:12:30 PM GMT

Badger

Leon

Well my motors around 9000 revs or so and I have it on an polou independent axles with gearing of 344:1 on 2 1.5 volt batteries (3 volts) so the side to side most likely will not be enough to do it then. Ok thanks for your input


Badger

Carl Hayes

Why not estimate how far it veers, side to side (that's the amplitude), and how many times per second it does so (that's the frequency). Then, from the frequency and the amplitude, you can calculate the expected side-to-side acceleration and compare it with the published sensitivity of the accelerometer. Then you'll know whether or not the accelerometer can be expected to detect it.

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· -- Carl, nn5i@arrl.net

awesomeduck

Unless your robot is really veering hard to one side, and the normal speeds of a robot its unlikely you can detect the veer from the normal jitter. I have placed the 2125 in my car and the readings from the idle of the car or just driving straight on a slightly bumpy road make me think it would be hard to make a valid conclusion from the readings you will be getting.