int led1 = 3;
int led2 = 4;
char key = '0'; 
void setup(){
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
Serial.begin(9600);
Serial.println("My arduino"); 
digitalWrite(led1, LOW);
digitalWrite(led2, LOW);
}
void loop(){
if (Serial.available() > 0) {
key = Serial.read();
Serial.print("key:");
Serial.println(key); 
}
if (key == '0') {
digitalWrite(led1, LOW);
digitalWrite(led2, LOW);
Serial.println("LED1 LED2 OFF");
}
if (key == '1') {
digitalWrite(led1, HIGH);
Serial.println("LED1 ON");
}
if (key == '2') {
digitalWrite(led2, HIGH);
Serial.println(" LED2 ON");
}
}