Keyestudio Smart Little Turtle Robot V3 Manual page 126

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Bluetooth
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*/
int ledpin=3;
void setup()
{
Serial.begin(9600);
pinMode(ledpin,OUTPUT);
}
void loop()
{
int i;
if (Serial.available())
{
i=Serial.read();
Serial.println("DATA RECEIVED:");
if(i=='1')
{
digitalWrite(ledpin,1);
Serial.println("led on");
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