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Introduction：
In this project, we will put five functions, namely line tracking, obstacle avoidance, Bluetooth and IR remote control, distance detecting, together into one to
realize the working mode of the car. Press"5"button of IR remote control to start line tracking, "6" to start ultrasonic obstacle avoidance and distance detecting, "7"
to start IR remote control, "8"to start Bluetooth remote control, and press reset button to enter initialized mode.
Schematic Diagram：
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