Keyestudio Smart Little Turtle Robot V3 Manual page 116

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6. EN/BRK: break connect, it means breaking the Bluetooth connection,
generally, keep it unconnected.
Pay attention to the pin direction when inserting Bluetooth module,
and don't insert it before uploading test code
(4) Test Code
/*
keyestudio smart turtle robot
lesson 7.1
bluetooth
http://www.keyestudio.com
*/
char ble_val; //character variable, used to store the value received by
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