Keyestudio 4WD Bluetooth Multi-functional Car Manual page 57

Sample Code：
*******************************************************************************
int val;
int ledpin=13;
void setup()
{
Serial.begin(9600);
pinMode(ledpin,OUTPUT);
}
void loop()
{ val=Serial.read();
if(val=='a')
{
digitalWrite(ledpin,HIGH);
delay(250);
digitalWrite(ledpin,LOW);
delay(250);
Serial.println("keyestudio");
}
}
*******************************************************************************
Result
After power-on, power indicator D1 is on, and LED on Bluetooth module is blinking; open Bluetooth on mobile phone, pair them, input 1234, and finish pairing as
shown in Figure 1 ; open APP—Bluetooth serial communication assistant, connect it to Bluetooth, select normal mode, complete connection, and LED on
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