There are plenty of STEM robots available for beginners. The MiniBalance ROS Ackermann Robot Car is made for serious developers. It comes with LiDAR navigation, Raspberry Pi brain, built-in PD controller, and everything you need to get started.
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This robot has an aluminum alloy structure with 60mm wheels. It is smart enough to follow objects and people in any direction. It has a RGBD depth camera to measure the distance from objects in front of it. The companion app lets you view a live feed from the robot.
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