Here is a cool educational robot with various sensors that can teach you a thing or two about robotics. The ROBOTIS Bioloid has various sensors, including gyro, distance ranger, IR, and external IO ports for adding your own sensors. It also features ZigBee wireless functionality. You can adjust its posture while walking. The robot is programmable with motion teaching.
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This robotic kit is not cheap, but it does teach you a thing or two about robots. You can find out more about it here.
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