>
> Hi...
>
> I want to build a sophisticated obstacle avoiding robot with a servo
> sweep and a proximity sensor on top of it. I don't want the robot to
> just make a change in direction everytime it sees an object. It has to
> be able to see two objects and then calculate the distance between
> them and decide if theres enough space to get through. Does anyone in
> here have any experience with that sort of calculations? I will like
> some help on choosing the right sensor too. I'm thinking about a Sharp
> GP2D12 or some other inexpensive sensor.
>
> Thank you in advance:)
>
Think about Figure 8 "Analog Output Voltage vs. Detection Distance"
and see if the sensor will fit your needs.
Note that at distances of 10cm (4 inches) the beam width is fairly
narrow. Unfortunately, the graph doesn't cover the effective range
out to 80 cm. http://www.acroname.com/robotics/parts/SharpGP2D12-15.pdf
I know for a fact that two such sensors mounted vertically on a
Minisumo Mark III can lose an opponent less than 30 cm away because of
slightly divergent alignment. That is, if the 'bot is turning left
and first sees the opponent with the left sensor, that sensor will
lose the opponent before it is picked up by the right sensor. The
opponent is in the gap and invisible.
The nice thing about the GP2D12 is that you get distance to the object
within its' range. Other schemes such as cameras need a stereo view
to compute distance.
The GP2D12 is reasonably priced. Why not buy one and just experiment
and see if you get what you want?
Richard
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