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Feb 24, 2014, 12:16 AM
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RC car heading hold




It's a tale as old as time, but no-one did it for the least cost. Put in a simple analog gyro & P feedback algorithm. There's just enough proportionality in the bang bang steering for it to work quite well.




Didn't bother with I feedback, since it would suck battery power to constantly drive the steering motor. The steering is so imprecise, it always oscillates around the desired heading. The heading drifts noticeably. Upgrading to a full IMU would require a new CPU.

RC Car heading hold tests (5 min 15 sec)



It can go without manual steering for a bit longer than before. Rough road is now effortless to drive over. It's come a long way from its stock $40 ways, with a crusty old microcontroller with only 256 bytes of RAM.




The 5 year old pot has begun its decline. It definitely needs to be mounted diagonally.
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