 | | Help with my robot —Ahui Herrera
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| | | I got a problem. I have a simple two motor robot that I want to have a push button cause the following: 1 hit the push button 2 robot turns 180 deg and move forward 3. after 15 feet robot stops 4 repeat 1 - 3 The problme i am having is that the (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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| | | | | Re: Help with my robot —Robert G. Fay
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| | | | | My first suggestion would be a swivel wheel in the front to make turning easier for the bot. The only solution to your programming would be two rotation sensors to aid in running straight and to measure the distance that you have traveled. This (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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| | | | | Re: Help with my robot —Mark Crosbie
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| | | | | (...) You will probably need a rotation sensor to ensure that the robot is travelling in a straight line. No two LEGO motors will rotate at the same speed, so you will always encounter drift when driving a robot. I can think of three solutions: 1. (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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| | | | | | | Re: Help with my robot —Juergen Stuber
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| | | | | | | (...) 4. Measure the deviation and correct it by a small turn every now and then. (this is what I did when I first got my RIS and wanted it to take a tour of my flat, total length about 15m with a few turns). This avoids use of rotation sensor or (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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| | | | | | | Re: Help with my robot —Peter Vogel
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| | | | | | (...) Especially when they have to turn in opposite directions, as in the case of a standard differential drive robot (with one motor driving the left and the other the right side of the robot)! This is because a motor is always more efficient (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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| | | | | Re: Help with my robot —Steve Baker
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| | | | | (...) As lots of other people have said - you really need rotation sensors. If you don't have one - then a line-follower is an option (as other people have also suggested)...or I *suppose* you could put a bright light at either end of your 15 foot (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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| | | | | | | Re: Help with my robot —Sebastian Scherer
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| | | | | | | You can create two rotation sensors with two gears and the two touchsensors. (24 years ago, 12-Dec-00, to lugnet.robotics)
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| | | | | | | Re: Help with my robot —Rainer Balzerowski
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| | | | | | (...) I thought in the same direction. For driving straight you don't need a light sensor (but for accurate turning) It must work with two touchsensors that were touched from an arm placed on the "detector-wheel". So you are able to detect to which (...) (24 years ago, 14-Dec-00, to lugnet.robotics)
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| | | | | | | | Re: Help with my robot —Steve Baker
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| | | | | | (...) Yes - but that's using TWO inputs. With a little thought, you can actually get the direction from a single light sensor. Make your detector wheel white around one half and black around the other half. Looking at the wheel, you'd want: Light (...) (24 years ago, 15-Dec-00, to lugnet.robotics)
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| | | | | Re: Help with my robot —Peter Vogel
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| | | | Bob Fay's suggestion is a good one, here's another option: Drive both sides with a single motor via a differential, add a rack + pinion steering to the front, or, if you have a second differential, create a mixing differential for a skid-steered (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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