int red = 11;
int yellow = 12;
int green = 13;
String command;
void setup()
{
    pinMode(red, OUTPUT);
    pinMode(yellow, OUTPUT);
    pinMode(green, OUTPUT);
    Serial.begin(9600);
}
bool onExit = false;
void loop() {
    String incomingChar;
    if (Serial.available() || onExit)
    {
        incomingChar = Serial.readString();
        if (incomingChar ==  "red_on" || incomingChar == "red_off" ||
            incomingChar == "yellow_on" || incomingChar == "yellow_off" || incomingChar == "green_on" || incomingChar == "green_off" || onExit)
        {
            if (!onExit)
                command = incomingChar;

            if (command == "red_off")
                clear();
                Serial.println("Включен режим 1");

            if (command == "yellow_on")
                clear();
                Serial.println("Включен режим 2");

            if (command == "yellow_off")
                clear();
                Serial.println("Включен режим 3");

            if (command == "green_on")
                clear();
                Serial.println("Включен режим 4");

            if (command == "green_off")
                clear();
                Serial.println("Включен режим 5");
/*
            if (command == "red_on")
                clear();
                Serial.println("Включен режим 6");*/

            onExit = false;
        }
    }

    if (!onExit)
        command = incomingChar;

    if (command == "green_on")
        normal(red);

    if (command == "green_off")
        clear();

    if (command == "yellow_on")
        normal(yellow);

    if (command == "yellow_off")
        clear();

    if (command == "red_on")
        normal(green);

    if (command == "red_off")
        clear();
}
void checkexit()
{
    if (Serial.available())
    {
        String  incomingChar = Serial.readString();
        if (incomingChar == "red_on" || incomingChar == "red_off" ||
            incomingChar == "yellow_on" || incomingChar == "yellow_off" || incomingChar == "green_on" || incomingChar == "green_off")
        {
            onExit = true;
            command = incomingChar;
            clear();
        }
    }
}
void clear()
{
    digitalWrite(red, LOW);
    digitalWrite(green, LOW);
    digitalWrite(yellow, LOW);
}

void normal(int color)
{
    digitalWrite(color, HIGH);
}
void unnormal()
{
    digitalWrite(red, HIGH);
    digitalWrite(yellow, HIGH);
    digitalWrite(green, HIGH);
    checkexit();
    if (onExit)
        return;
    delay(1000);

    digitalWrite(red, LOW);
    digitalWrite(green, LOW);
    digitalWrite(yellow, LOW);
    checkexit();
    if (onExit)
        return;
    delay(1000);
}



//
//#define BUZZER_PIN 3
//#define LDR_PIN A0
//
//void setup()
//{
//  pinMode(BUZZER_PIN, OUTPUT);
//}
//
//void loop()
//{
//  int val, frequency;
//
//  val = analogRead(LDR_PIN);
//  frequency = map(val, 0, 1023, 3500, 4500);
//
//  tone(BUZZER_PIN, frequency, 20);
//}