KY-026 Flame Sensor Module

// Declaration and initialization of the input pins
int analog_input = A0; // Analog output of the sensor
int digital_input = 3; // Digital output of the sensor

void setup() {
    pinMode(analog_input, INPUT);
    pinMode(digital_input, INPUT);
    Serial.begin(9600); // Serial output with 9600 bps
    Serial.println("KY-026 Flame detection");
}

void loop() {
    float analog_value;
    int digital_value;

    // Current values are read out, converted to the voltage value...
    analog_value = analogRead(analog_input) * (5.0 / 1023.0); 
    digital_value = digitalRead(digital_input);

    //... and printed at this point
    Serial.print("Analog voltage value: "); 
    Serial.print(analog_value, 4);
    Serial.print(" V, 	 Threshold value: ");

    if (digital_value == 1) {
        Serial.println("reached");
    } else {
        Serial.println("not yet reached");
    }
    Serial.println("----------------------------------------------------------------");
    delay(1000);
}