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-   -   Bad readings from the maxbotics sonar (http://www.chiefdelphi.com/forums/showthread.php?t=125316)

GuyM142 27-01-2014 06:31

Bad readings from the maxbotics sonar
 
We've managed to wire the sonar to the robot and get reading from it with the LV example,
The problem is that the readings are not accurate. (For both digital and analog)
We actually have 2 of them and both of them aren't accurate. (The readings are jumping or gradually rising to what seems random numbers).
We could read right distances once but it went bad again.
What can we do?

Herbblood 27-01-2014 08:14

Re: Bad readings from the maxbotics sonar
 
We had the same problem and found there were some errors, but we took some data to find a number ours 1.242 I think, which would lead the number read to be closer to the actual distance. Some of the problems with the sensor may be that it is being affected by temperature which changes the speed of sound or then "beam" may be picking up other things in the same area.

GuyM142 27-01-2014 11:26

Re: Bad readings from the maxbotics sonar
 
Quote:

Originally Posted by Herbblood (Post 1333047)
We had the same problem and found there were some errors, but we took some data to find a number ours 1.242 I think, which would lead the number read to be closer to the actual distance. Some of the problems with the sensor may be that it is being affected by temperature which changes the speed of sound or then "beam" may be picking up other things in the same area.

How did you get to that number?

JesseK 27-01-2014 11:54

Re: Bad readings from the maxbotics sonar
 
We found that there is different backscatter in the beam depending on if you're sensing over carpet vs. sensing over linoleum.

Using a narrow-beam sensor or mounting the sensor > 18" form the ground solved the more general backscatter problem for us, mostly.


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