Author Topic: obstacle avoidance /line following  (Read 3717 times)

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Offline airman00Topic starter

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obstacle avoidance /line following
« on: November 18, 2007, 01:17:05 PM »
I need a robot to follow a line and go around obstacles which may be present on the line .

Now , should I just use one IR sensor that is stationary or should I use one scanning IR sensor( on a servo)?

Would the scanning be overkill for detecting an object  , going around the object, and then finding the line again?


what do you guys think?
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Offline Admin

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Re: obstacle avoidance /line following
« Reply #1 on: November 18, 2007, 01:53:14 PM »
Hmmmm, I'd just use a photoresistor and a green LED paired up. If green light reflects off an object, it will come back to your photoresistor. But it also depends on how big your robot is . . .

Offline airman00Topic starter

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Re: obstacle avoidance /line following
« Reply #2 on: November 18, 2007, 02:04:39 PM »
small robot, and the entire robot fits in a 22cm circle  ( around 8 inches)


stationary it is...
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Offline Rebelgium

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Re: obstacle avoidance /line following
« Reply #3 on: November 18, 2007, 02:55:12 PM »
use three of these:
http://www.robotshop.ca/home/products/robot-parts/sensors/contact-sensors/sharp-gp2y0d340k-ir-sensor.html
one in the front center, and one on each front corner.

or an ir sharp range finer on a servo
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Re: obstacle avoidance /line following
« Reply #4 on: November 18, 2007, 04:12:45 PM »
The reason I said photoresistor+LED was because it has a very large sensor angle (like sonar), whereas the sharp IR's are precision based, in which case they need to be scanned.

 


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