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diff --git a/doc/Lesson 2 Bluetooth Car/bluetooth_blink/bluetooth_blink.ino b/doc/Lesson 2 Bluetooth Car/bluetooth_blink/bluetooth_blink.ino
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+//www.elegoo.com
+//2016.09.12
+
+int LED=13;//Define 13 pin for LED
+volatile int state = LOW;//The initial state of the function is defined as a low level
+char getstr; //Defines a function that receives the Bluetooth character
+void setup() {
+ pinMode(LED, OUTPUT);
+Serial.begin(9600);
+}
+/*Control LED sub function*/
+void stateChange()
+{
+ state = !state;
+ digitalWrite(LED, state);
+}
+void loop() {
+ getstr=Serial.read();//The Bluetooth serial port to receive the data in the function
+ if(getstr=='A'){
+ stateChange();
+ }
+}