#define tombol1 2 // inisial pin
#define tombol2 3
#define led1 4
#define led2 5

int data1, data2; // variabel untuk menyimpan data tombol

void setup() {
  // put your setup code here, to run once:
pinMode(tombol1, INPUT);
pinMode(tombol2, INPUT);
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
data1=digitalRead(tombol1);//menyimpan keadaan tombol pada variabel data1
data2=digitalRead(tombol2);

if(data1==HIGH) // jika tombol1 ditekan
{
  digitalWrite(led1,HIGH);//menyalakan led1
  digitalWrite(led2,LOW);
}
else if (data2==HIGH)//jika tombol2 ditekan
{
  digitalWrite(led1,LOW);
  digitalWrite(led2,HIGH);//menyalakan led2
}
}