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To the doubters* my 8 yo son and I say 'thbbbbbbsbb'. For about £30 we have an Arduino based 3 wheeled robot capable of object avoidance. We've since added a line following sensor and and a Bluetooth module. *school 'friends' who said it couldn't be done and tried to dissuade my boy from his dreams.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/budget-robot-from-avoider-to-follower-and-beyond