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my first line following robot using 6 'nokia' cellphone battery (code bl2c) for motor driver and its power (12v) , plus 4 for the minimum system (mikrocontroller, sensor, etc). i used atmel mega32 for the brain, and IR for sensoric system.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/line-cruiser