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UPDATE 7: I'm still busy with making a good chassis. Soon I will update this page with new photos and a video of my robot in action. UPDATE 6: I'm not going to contact Technobotsonline.com, I think that I have a good solution for the problem. Because problaby the voltage that the 2 NiMH AAs give isn't high enough. The motors that come with the Twin Motor Gearbox Kit problably work good with a voltage of 1.5V - 4.5V. The NiMH AAs give 2.4V together. But there is ~1V lost in the H-Bride / Motordriver. ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/auto-navigating-intelligent-arduino-robot