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Official Description

Now you can use this app to connect to your Andruino board via bluetooth! You must be paired with the Arduino board. In most cases, the default PIN in a Arduino Bluetooth Module is 1234. You must use a HC-05 Bluetooth module.

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Example Sketch:
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#include

SoftwareSerial bluetooth(10, 11);

void setup()
{
bluetooth.begin(9600);
}

void loop()
{
int incomingByte = 0;
String content = "";
char character;

while(bluetooth.available())
{
character = bluetooth.read();
content.concat(character);
}

if (content!="")
{
bluetooth.print(content);
}
delay(100);
}