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Hi, I thought of a new project and would like some input on the idea. My idea is to set up a sand box and hide objects to simulate land mines. My thought was to have a robot search for the hidden mines. My question is, how can I get the robot to (...) (22 years ago, 13-Jan-03, to lugnet.robotics)
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| | Re: Land mine robot
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I bought a metal detector circuit kit to do the same thing. Even though the kit was a good value (around $15), it requires a radio. A little dismayed (since I don't want to add a metal detector AND radio to a bot), I searched the net for schematics (...) (22 years ago, 13-Jan-03, to lugnet.robotics)
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| | Re: Land mine robot
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How about using magnets for mines and reed switch-based sensors for detection? (...) (22 years ago, 13-Jan-03, to lugnet.robotics)
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| | Re: Land mine robot
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(...) A Hall Effect sensor with suitable signal conditioning would be one way, if they're ferric. Another, assuming all your 'mines' are ferric, would be to put a magnet on a swing arm with a switch that would engage when the magent was attracted to (...) (22 years ago, 13-Jan-03, to lugnet.robotics)
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| | Links... Re: Land mine robot
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(URL) Original Message ----- From: "Scott Davis" <rcx2man@hotmail.com> To: <lego-robotics@crynwr.com> Sent: Sunday, January 12, 2003 10:08 PM Subject: Land mine robot (...) thought (...) I (...) (22 years ago, 13-Jan-03, to lugnet.robotics)
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| | Re: Land mine robot
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I hate to be a party-pooper, but I would strongly recommend you think twice about getting sand mixed up with Lego gears, axles and motors. I don't know if you could use some other medium like ground up packing material or little foam balls as your (...) (22 years ago, 13-Jan-03, to lugnet.robotics)
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| | Re: Land mine robot
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(...) I'd say use sand, just don't use tracks because they clog up when turning. Use a four wheel chassis for stability with central pivot. Power only the front wheels and then independantly so you can steer. The rear wheels will then follow (...) (22 years ago, 13-Jan-03, to lugnet.robotics)
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| | Re: Land mine robot
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(...) I've just thought of an even better system. Build a two wheel robot with a turntable on the top over the centre of rotation. Attach an arm to the turntable which links back to the rear wheels. You can then turn the front part through 90 degree (...) (22 years ago, 13-Jan-03, to lugnet.robotics)
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| | Re: Land mine robot
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(...) Why even use sand at all? If the challenge is for mine detection, use a flat surface, and have the mines be attached to the underside. This allows for very simple drive systems, and no surface clues to show for the mines, or possible bias by (...) (22 years ago, 13-Jan-03, to lugnet.robotics)
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| | Re: Land mine robot
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(...) Why underneath? A flat surface with paper discs taped down to represent mines would be fine. Then the light sensor could be used to detect them. After all, the point is really to find them without rolling over any while searching. You'd need (...) (22 years ago, 13-Jan-03, to lugnet.robotics)
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| | Re: Land mine robot
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(...) I specified underneath to make it unlikely that the robot would detect them by either optical means (because I assumed that the challenge was for a non-visual method), and to prevent any cheating by a team using some form of IR flash to inform (...) (22 years ago, 13-Jan-03, to lugnet.robotics)
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| | Re: Land mine robot
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(...) I've been using mine in sand, dirt, middle of the street, etc. for years and haven't had any serious problem. Just be sure to clean everything when you're done. Warm water and gentle dish detergent is what I suggest (don't do the motors (...) (22 years ago, 14-Jan-03, to lugnet.robotics)
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