#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x20,16,2);
int linkse_knop = 2;
int rechtse_knop = 3;
int linkse_led = 4;
int rechtse_led = 5;
int richting_knop = 6;
int wagen_led = 7;
int waarde1 = LOW;
int waarde2 = LOW;
int waarde3 = LOW;

void setup()
{
  pinMode(linkse_knop, INPUT);
 pinMode(rechtse_knop, INPUT);
  pinMode(linkse_led, OUTPUT);
 pinMode(rechtse_led, OUTPUT);
 pinMode(richting_knop, INPUT);
 pinMode(wagen_led, OUTPUT);
  Serial.begin(9600); 
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("monitor display");
  delay(3000);
  lcd.clear();
  
}

void loop()
{
 waarde1 = digitalRead(linkse_knop);
 waarde2 = digitalRead(rechtse_knop);
 waarde3 = digitalRead(richting_knop);
   if (waarde3 == LOW) {
                      if (( waarde1 == HIGH) && (waarde2 == LOW)) {
                             digitalWrite(linkse_led,HIGH);
                             delay(1);
                             digitalWrite(linkse_led,LOW);
                             Serial.write(50);
                             lcd.setCursor(0,0);
                             lcd.print("links vooruit   ");
                                              }
                      if (( waarde1 == LOW) && (waarde2 == HIGH)) {
                             digitalWrite(rechtse_led,HIGH);
                             delay(1);
                             digitalWrite(rechtse_led,LOW);
                             Serial.write(65);
                             
                             lcd.setCursor(0,0);
                             lcd.print("rechts vooruit  ");
                                              }
                      if (( waarde1 == HIGH) && (waarde2 == HIGH)) {
                             digitalWrite(linkse_led,HIGH);
                             digitalWrite(rechtse_led,HIGH);
                             delay(1);
                             digitalWrite(linkse_led,LOW);
                             digitalWrite(rechtse_led,LOW);
                             Serial.write(70);
                             lcd.setCursor(0,0);
                             lcd.print("vooruit         ");
                                              }
                       if (( waarde1 == LOW) && (waarde2 == LOW)) {
                          
                             Serial.write(40);
                             lcd.setCursor(0,0);
                             lcd.print("stop            ");
                                              }
                                              
                                    }
                                    
      if (waarde3 == HIGH) {
                      if (( waarde1 == HIGH) && (waarde2 == LOW)) {
                             digitalWrite(linkse_led,HIGH);
                             delay(100);
                             digitalWrite(linkse_led,LOW);
                             Serial.write(80);
                             lcd.setCursor(0,0);
                             lcd.print("links achteruit ");
                                              }
                      if (( waarde1 == LOW) && (waarde2 == HIGH)) {
                             digitalWrite(rechtse_led,HIGH);
                             delay(100);
                             digitalWrite(rechtse_led,LOW);
                             Serial.write(30);
                             lcd.setCursor(0,0);
                             lcd.print("rechts achteruit");
                                              }
                      if (( waarde1 == HIGH) && (waarde2 == HIGH)) {
                             digitalWrite(linkse_led,HIGH);
                             digitalWrite(rechtse_led,HIGH);
                             delay(100);
                             digitalWrite(linkse_led,LOW);
                             digitalWrite(rechtse_led,LOW);
                             Serial.write(20);
                             lcd.setCursor(0,0);
                             lcd.print("achteruit       ");
                                              }
                       if (( waarde1 == LOW) && (waarde2 == LOW)) {
                          
                             Serial.write(10);
                             lcd.setCursor(0,0);
                             lcd.print("stop            ");
                                              }
                                              
                                    }
                                              
 
 delay(100);
}
void serialEvent(){
    // while (Serial.available()) {
  int wagenafstand=Serial.read();
  if ((wagenafstand==90)) {
                           digitalWrite(wagen_led,HIGH);
                          // delay(1000);
                           //digitalWrite(wagen_led, LOW);
                           lcd.setCursor(0,1);
                           lcd.print("!");
                           delay(100);
                           }
                           else
                           {
                             digitalWrite(wagen_led, LOW);
                             lcd.setCursor(0,1);
                           lcd.print(" ");
                           }
     }
                //  }