Arduino robot is one of the most interesting topic for every Arduino hobbyist. To build a good robot you need a good robot platform, especially all the wheels need to be equally smooth in order to make it always able to walk straight.
When I start build my first Arduino robot a couple years ago, I bought my 4 wheel drive robot platform from a local electronic shop, it was a simple platform, it works but there is a lot of things you need to aware like wheels alignment.
Simple Cheap 4 Wheels Arduino Robot Platform
It takes me some times to calibrate my robot micro-speed motors not like my friends who get their good quality 2 Wheel Drive (2WD) Arduino Robot Platform
2 Wheels Arduino Robot Platform
4 Wheels Arduino Robot Platform
In case you are not able to make your robot to walk in a straight line, you still can apply difference speed on both side of the wheels to make it walk straight.
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Great post…… i will use it for making a brand new robot.