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This robot is called Wheelee. It is simple inverted pendulum robot made on arduino. Sensors: L3G gyroLSM303 accelerometerMotor driver: DualVNH5019MotorShield Firmware, Matlab model, Android application and some articles are on Github repository
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/wheelee