obstacle avoidance /line following

[airman00]

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?

[Admin]

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 . . .

[airman00]

small robot, and the entire robot fits in a 22cm circle  ( around 8 inches)


stationary it is...

[Rebelgium]

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

[Admin]

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.