Med display

#include <LiquidCrystal.h>

#define TRIG_PIN 9
#define ECHO_PIN 8
#define SOUND_PIN 12
#define BUTTON_PIN 2
#define RED_LIGHT 5
#define BLUE_LIGHT 6

int LIGHT_RED_TIME = 500;
int LIGHT_BLUE_TIME = 500;

long long start;
long long lastToggle;
long long lampTimer;
bool active;

LiquidCrystal lcd(11, 10, 7, 4, 3, 1);

void setup(){

    Serial.begin(115200);

    pinMode(ECHO_PIN, INPUT);
    pinMode(TRIG_PIN, OUTPUT);
    pinMode(SOUND_PIN, OUTPUT);
    pinMode(BUTTON_PIN, INPUT);
    pinMode(RED_LIGHT, OUTPUT);
    pinMode(BLUE_LIGHT, OUTPUT);

    lastToggle = millis();
    active = false;

    lcd.begin(16,2);
}

void skriv(){
    lcd.print("Ringer polis");
    lcd.clear();
}

float getDistance(){
    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);

    double duration = pulseIn(ECHO_PIN, HIGH);

    return(0.0343*duration/2);
}

bool isButtonPressed(){
    if (digitalRead(BUTTON_PIN)){
        if (millis() - lastToggle > 250){
            lastToggle = millis();
            digitalWrite(RED_LIGHT, LOW);
            digitalWrite(BLUE_LIGHT, LOW);
            return(true);
        }
    }
    return(false);
}

void alarm(){

    lampTimer = millis();
    bool redOn = false;

    while (!isButtonPressed()){
        noTone(SOUND_PIN);
        if (millis() - lampTimer > LIGHT_BLUE_TIME && redOn == false){
            redOn = true;
            digitalWrite(RED_LIGHT, HIGH);
            digitalWrite(BLUE_LIGHT, LOW);
            lampTimer = millis();
            LIGHT_RED_TIME = getDistance() * 10;
        }
        if (millis() - lampTimer > LIGHT_RED_TIME && redOn == true){
            redOn = false;
            digitalWrite(RED_LIGHT, LOW);
            digitalWrite(BLUE_LIGHT, HIGH);
            lampTimer = millis();
            LIGHT_BLUE_TIME = getDistance() * 10;
        }
        skriv();
    }
}

void loop(){

    if (getDistance() < 50 && active == false){
        tone(SOUND_PIN, 400);
        start = millis();
        active = true;
    }

    while (active){
        if (millis() - start < 5000){
            if (isButtonPressed()){
                active = false;
                noTone(SOUND_PIN);
                delay(3000);
                break;
            }
        }
        if (millis() - start > 5000){
            active = false;
            alarm();
        }
    }
}