PhotonCloudFunction/HTML-LED at master · kugamigh/PhotonCloudFunction · GitHub

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int checkLED(String led);
int redPin = D4;
int yellowPin = D3;
int bluePin = D2;

void setup() {
    Particle.function("led", checkLED);
    pinMode(redPin, OUTPUT);
    pinMode(yellowPin, OUTPUT);
    pinMode(bluePin, OUTPUT);
}

void loop() {
}

int checkLED(String led) {
    int result = 0;

    if (led == "red") {
        digitalWrite(redPin, HIGH);
        digitalWrite(yellowPin, LOW);
        digitalWrite(bluePin, LOW);

        result += 1;
    }
    else if (led == "yellow") {
        digitalWrite(redPin, LOW);
        digitalWrite(yellowPin, HIGH);
        digitalWrite(bluePin, LOW);

        result += 2;
    }
    else if (led == "blue") {
        digitalWrite(redPin, LOW);
        digitalWrite(yellowPin, LOW);
        digitalWrite(bluePin, HIGH);

        result += 4;
    }
    if (result > 0) {
        return result;
    }

    return -1;
}