I want to measure speed of moving object. I think many ways can be do.
Encoder, accelerometer, GPS or other. I want to know how the concept and the performance?
This way need to put encoder on the tyre and need tyre size calibration.sich WROTE:Usually encoder is for wheeled mobile robot and linked system like robot arm.
The accelerometer measure accelaration, so to get speed/velocity I need to integrate that measurement in term of time. How accurate this?sich WROTE:Accelerometer as its name suggests, it measures the acceleration. Normally, you can get X, Y and/or Z-axes measurement in a single chip. It's used in system which needs to capture impact to execute some actions. For example the air beg system in modern car, humanoid balancing control and so on.
GPS then, I think higher cost from the other way. Because of very far satellite distance, maybe the reading have an error a few meters right?sich WROTE:While for GPS, if not mistaken the best resolution we can get as consumer is around a few meters. So It's good for navigation which doesn't need very high accuracy, but requires wide coverage area.
AMD WROTE:well, for ur seensor, u can use a gear tooth sensor (magnetic pickup)..
this kind of sensor also being use for ABS devices on car AFAIK...
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