#define BUTTON_PIN_GREEN 25  // ESP32 pin GPIO25, which connected to button
#define LED_PIN    2  // ESP32 pin GPIO18, which connected to led
#define BUTTON_PIN_RED 26  // ESP32 pin GPIO25, which connected to button

// variables will change:
int led_state = LOW;    // the current state of LED
int button_state_green;       // the current state of button
int last_button_state;  // the previous state of button
int button_state_red; 
void setup() {
    // put your setup code here, to run once:
    Serial.begin(115200);
    Serial.println("Hello, ESP32!");
    pinMode(LED_PIN, OUTPUT);
    pinMode(BUTTON_PIN_GREEN, INPUT_PULLUP);
    pinMode(BUTTON_PIN_RED, INPUT_PULLUP);

    button_state_red = 1;
}

void loop() {
    if (button_state_red == HIGH ){
        button_state_red = 1;

        button_state_green = 1;
        Serial.println("SANG 3s TOI 1S");
        while(button_state_green == 1){
            button_state_red = digitalRead(BUTTON_PIN_RED);
                   

            if (button_state_red == 0) break;
            digitalWrite(LED_PIN, HIGH);
            delay(3000);
            digitalWrite(LED_PIN, LOW);
            delay(1000);
            button_state_green = digitalRead(BUTTON_PIN_GREEN);
            
        }   
       if (button_state_red == HIGH ){
            button_state_green = 1;
            Serial.println("SANG 1s TOI 3S");

            while(button_state_green == 1 ){
                button_state_red = digitalRead(BUTTON_PIN_RED);
                if (button_state_red == 0) break;

                digitalWrite(LED_PIN, HIGH);
                delay(1000);
                digitalWrite(LED_PIN, LOW);
                delay(3000);
                button_state_green = digitalRead(BUTTON_PIN_GREEN);
                
            }
       }
       
    }

    Serial.println("OUT");
       
       button_state_red = digitalRead(BUTTON_PIN_RED);
       
}