int LED = 6;//berada di pin 5 arduino uno
int BTN1 = 5;//berada di pin 6 arduino uno
int LED2 = 2;//berada di pin 2 arduino uno
int LED3 = 3;//
int BTN2 = 4;//
int BTN3 = 7;//
void setup() {
 
 pinMode(LED, OUTPUT);
 pinMode(LED2, OUTPUT);
 pinMode(LED3, OUTPUT);
 pinMode(btn, INPUT_PULLUP);
 pinMode(BTN2, INPUT_PULLUP);
 pinMode(BTN3, INPUT_PULLUP);
 digitalWrite(LED, LOW);
 digitalWrite(LED2,LOW);
 digitalWrite(LED3,LOW);

}

void loop() {
 if(digitalRead(btn)==LOW){
  digitalWrite(LED, HIGH);
  digitalWrite(LED, LOW);
}
if (digitalRead(BTN2) == LOW;){
  digitalWrite(LED3, HIGH);
  digitalWrite(LED3, LOW);
}  
if(digitalRead(BTN3) == LOW){
  digitalWrite(LED2, HIGH);
  digitalWrite(LED2, LOW);
}
}