#define buttonPin 4
#define ledPin 2
#define ledPin2 8
int interval = 1000;
unsigned long previousMillis=0;
int buttonState = 0;
unsigned long debounceDelay=50;
void setup() {
pinMode(buttonPin, INPUT);
pinMode(ledPin, OUTPUT);
pinMode(ledPin2, OUTPUT);
Serial.begin(9600);}
void loop() {
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval){
previousMillis = currentMillis;
digitalWrite(ledPin,!digitalRead(ledPin));
digitalWrite(ledPin2,!digitalRead(ledPin2));  }
int reading = digitalRead(buttonPin);
if (reading != buttonState) {
buttonState = reading;
if (buttonState == HIGH) {
interval = interval + 100;
Serial.print("Interval je: ");
Serial.println(interval);}}}