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The only feasible one is the laser sensor. However, it's too expensive. Does anyone have the experience of buliding a laser distance measurement sensor?
what about the resolution of your system?
If there is bringt sunlight, Does your system still work well?
your solution seems cubersome.
http://www.acroname.com/robotics/parts/R14-SONAR1.html
http://www.acroname.com/robotics/parts/R13-INST.html
Well, he said 5 cm resolution - typically, with a range-finder, resolution refers to the distance measurement