/*
 * Name: mod5a_key12LED.ino
 * Date: 2021/10/26
 * Author: SW
 * Version 1.0
 */
 
// LED-Pins definieren
const int LED1 = 7; // LED1 (gelb) an Pin 7
const int LED2 = 6; // LED2 (blau) an Pin 6
const int LED3 = 5; // LED3 (grün) an Pin 5
const int LED4 = 4; // LED4 (rot) an Pin 4

const int KEY1 = 8; // Rote Taste (KEY1) an Pin 8
const int KEY2 = 9; // Blaue Taste (KEY2) an Pin 9

int keyState1 = 0; // Status von PIN_BUTTON1
int keyState2 = 0; // Status von PIN_BUTTON2

int currentLED = 7; // Start-LED (gelb) setzen
 
void setup() {
  // setzen der LEDs als Ausgang
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);

  // setzen der Buttons als Eingang
  pinMode(KEY1, INPUT_PULLUP); 
  pinMode(KEY2, INPUT_PULLUP);

  // Start-LED aktivieren
  digitalWrite(currentLED, HIGH);

  // Logger initialisieren
  Serial.begin(9600);
}
 
void loop() {

    // Status von KEY1 lesen
    keyState1 = digitalRead(KEY1);
    // Status von KEY2 lesen
    keyState2 = digitalRead(KEY2);

    if (keyState1 == LOW) 
    {
      Serial.println("RED BUTTON CLICK");
      digitalWrite(currentLED, LOW);
      if (currentLED > 4) {
        currentLED--;
      } else {
        currentLED = 7;
      }
      digitalWrite(currentLED, HIGH);
      delay(200);
    } 
    else if (keyState2 == LOW) 
    {
      Serial.println("BLUE BUTTON CLICK");
      digitalWrite(currentLED, LOW);
      if (currentLED >= 7) {
        currentLED = 4;
      } else {
        currentLED++;
      }
      digitalWrite(currentLED, HIGH);
      delay(200);
    }

}