/*
   https://forum.arduino.cc/t/led-schaltung-mit-3-tastern/1366411
   2025-03-23 by noiasca
   Sketch in Thread

*/
constexpr uint8_t key1 {5};  // orange?
constexpr uint8_t key2 {6};  // green?
constexpr uint8_t key3 {4};  // rest???

constexpr uint8_t ledGreen {8};
constexpr uint8_t ledYellow {9};
constexpr uint8_t ledRed {10};

enum State {IDLE, ORANGE, GREEN} state;  // die Zustände

void setup() {
  pinMode(key1, INPUT);
  pinMode(key2, INPUT);
  pinMode(key3, INPUT);
  pinMode(ledGreen, OUTPUT);
  pinMode(ledYellow, OUTPUT);
  pinMode(ledRed, OUTPUT);
}

void off() {
  digitalWrite(ledRed, LOW);
  digitalWrite(ledYellow, LOW);
  digitalWrite(ledGreen, LOW);
}

void loop() {
  switch (state) {
    case IDLE:
      if (digitalRead(key1) == HIGH) {
        digitalWrite(ledRed, HIGH);
        digitalWrite(ledYellow, HIGH);
        digitalWrite(ledGreen, LOW);
        state = ORANGE;
      }
      if (digitalRead(key2) == HIGH) {
        digitalWrite(ledRed, LOW);
        digitalWrite(ledYellow, LOW);
        digitalWrite(ledGreen, HIGH);
        state = GREEN;
      }
      break;
    case ORANGE:
    case GREEN:
      if (digitalRead(key3) == HIGH) {
        off();
        state = IDLE;
      }
      break;
  }
}
//