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that vacum looks fine. you should be able to use the battery that is in the vacuum to power the vacuum on your bot.Well to be honest around $20 for a sonar is a pretty good price. if you can give a link it would be good. Have you considered Sharp infrared snesors, they may work for your application and they can be got for around 10 each.do you know what controller you are going to use on your robot?sounds like a good projectJoker94
Don't rule out cables for power. A 240v(or whatever it is where you live) lead might work fine and could certainly be lighter than a battery for a vacuum.
then,i've go through the forum,and to make the robot able to turn left/right,i need some sonar sensor and omni-wheel.but i found that the sonar sensor i found are $20++usd!is there any other cheaper sonar sensor?
Whiskers generally refer to a tact switch with an extended piece of something to act as well... "whiskers". Mount one on each side and when one is tripped tell the robot to turn the other way, away from the wall it hit. Or maybe an idea for you, have it so the whiskers are always touching the walls then when one or both are not touching the wall, the robot will know there is an opening... What kind of ducts are we talking about here?
Some air ducts have screws sticking through on the inside. Just something to be aware of.
Yes, that's the idea behind the whiskers. What shape is the duct? Square?