Particle event handler for IFTTT Google Assistant.

PiGoogleAsstEvent.ino

/*
    Program with Particle Web IDE
    Board (tested with):
    - Raspberry Pi Zero WH
    - Raspberry Pi 3 Model A+
*/

const int led1 = D1; // D1 is refer to GPIO17
const int led8 = D2; // D2 is refer to GPIO27
const int buzzer = D8;

bool led1State = LOW; // a virtual boolean variable
bool led8State = LOW; // a virtual boolean variable
bool led8PrevState = LOW;
long prevMillis = 0;
int interval = 500;

void setup()
{
    pinMode(led1, OUTPUT); // led1 pin is set as output
    pinMode(led8, OUTPUT); // led8 pin is set as output
    pinMode(buzzer, OUTPUT);
    
    digitalWrite(led8, LOW);
  
    // Subscribe to events published by IFTTT using  Particle.subscribe
    Particle.subscribe("Light_On_Event", lightOnHandler); // Turning on function declaration
    Particle.subscribe("Light_Off_Event", lightOffHandler); // Turning off function declaration
    
    beep(2, 70);
}

void loop()
{
    if (millis() - prevMillis > interval) {
    
        led1State = !led1State;
        digitalWrite(led1, led1State);
    
        prevMillis = millis();
    }

    if (led8State != led8PrevState) {
        led8PrevState = led8State;
        
        digitalWrite(led8, led8State);
        
        beep(1, 70);
    }
}

// Our events are called when IFTTT applets are triggered
void lightOffHandler(const char *event, const char *data)
{
    led8State = LOW;
}

void lightOnHandler(const char *event, const char *data)
{
    led8State = HIGH;
}

void beep(int times, int delayMs)
{
    do {
        digitalWrite(buzzer, HIGH);
        delay(delayMs);
        digitalWrite(buzzer, LOW);
        delay(delayMs);
    } while (--times);
}