Keyestudio 4DOF - Page 207

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Test Code 8:
********************************************************************************************************************
void setup()
{
Serial.begin(9600); // set the serial baud rate to 9600
}
void loop()
{
char val; // define a variable, used to receive the value read from Bluetooth.
if(Serial.available()) // if receive the value
{
val = Serial.read(); // assign the value read to val
Serial.println(val);
}
}
********************************************************************************************************************
Test Result:
Upload the code, hookup well and power up. After connecting the Bluetooth APP, open the serial monitor and set
the baud rate to 9600, press down the control key on the APP, you should see the corresponding value. Shown