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Principle：
1. Connecting Aduino to Bluetooth module , this module communicating with APP on the mobile phone
2. APP sending "U""D""L""R""S" to Bluetooth module
3. Bluetooth module will send the received massage to Arduino, and Arduino controls the car correspondingly.
4. When Arduino receiving "U", the car goes forward; when Arduino receiving "D", it goes backward; when Arduino receiving "R", it turns right; when receiving
"S", it stops moving.
Schematic Diagram：
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