byte.ino

const int buttonPin = 4;

const int ledPin1= 10;
const int ledPin2 = 12;
const int ledPin3 = 11;


int initial = 0;
int oldstate = 0;
int buttonstate = 0;

void setup() {
pinMode(ledPin1, OUTPUT);
pinMode(ledPin2, OUTPUT);
pinMode(ledPin3, OUTPUT);
pinMode(buttonPin, INPUT);
}
void loop(){

buttonstate = digitalRead(buttonPin);
if(buttonstate == HIGH){
delay(50);
buttonstate = digitalRead(buttonPin);
if(buttonstate == LOW){
initial = oldstate + 1;
}
}
switch (initial){
case 1:
digitalWrite(ledPin1, HIGH);
digitalWrite(ledPin2, LOW);
digitalWrite(ledPin3, LOW);
oldstate = initial;
break;
case 2:
digitalWrite(ledPin1, LOW);
digitalWrite(ledPin2, HIGH);
digitalWrite(ledPin3, LOW);
oldstate = initial;
break;
case 3:
digitalWrite(ledPin1, LOW);
digitalWrite(ledPin2, LOW);
digitalWrite(ledPin3, HIGH);
oldstate = initial;
break;
default:
digitalWrite(ledPin1, LOW);
digitalWrite(ledPin2, LOW);
digitalWrite(ledPin3, LOW);
oldstate = 0;
break;
}
}