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I'm going to using a comparator to measure when the car gets out of range by measuring the signal...
Sounds like he has a plan for that, as the absolute location relative to the operator is irrelevant, only the signal strength really matters. Once the car goes out of range, it can use very basic mapping software to go back to the operator.As far as MCU's go, I recommend an AVR based one, preferably an atmega.
C++ can be used if he/she doesn't use classes, inheritance and other object-oriented hula-balu.C++ without "OO" is just plain old C.In software can do backtracking.For GPS, save information about its location every x-seconds.For non-GPS save information of direction (compass) and distance traveled (would need a wheel encoder).Main issue is storage. If you're willing to limit the range of the robot to the number of points that can be saved then you can remove the comparator from the system.