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Hello, I'm looking to build a robot which will quite simply drive along a perfectly straight line for 4 meters. So far the one I made has slight curves to one side or another. Is there a way I can fix the curving? Or are there tips in design which can help a robot drive straight?Which is better? Two stepper motors / Two DC motors with seperate shaft encoders / or Dual Differential Drive?Even if the mechanical part is done right, you still have to be sure that friction on one end is equal to the other end. This seems like a difficulut task. Any suggestions?
what if all he needs is to put a resistor on a motor. unequall motors strength
A gyro isn't going to drift very far in 4 meters...
sounds like i need to write a tutorial about dead-reckoning someday soon, i reckon . . .as dunk said, it very much depends on the terrain. but if you got perfect terrain, id vote for the gyro for simplicity . . .the drift on the gyro should be a measurable constant, for a given 4m course. if you can test beforehand on that exact 4m course, then you can tweak to eliminate the drift.
using a GPS helps a lot in navigation, but if I'm not wrong, the resolution is around 2-3 meters, so it wouldn't help too much if the goal was to drive straight over a short distance.
Really, they should just get rid of the inaccuracies of GPS and give everyone the accurate position information they want, since people will just come up with ways to get around it
they got rid of the intentional inaccuracies back in 2000 because of DGPS
They did? Wow, I'm so out of touch Suddenly I feel an urge to buy a cheap GPS and put it on a robot for fun.. haha..