ROBO | Flame Sensor

Functions

• detects the presence of fire using the infrared light emitted by it

  • The IR photodiode detects IR radiation and sets a value.

  • The LM393 comparator compares a set value and provides a digital output depending on if it reaches the threshold.

  • An analog value can also be provided to determine the intensity of the flame, which is directly from the terminal.

  • The sensitivity can be adjusted to avoid triggering.

Pins

• VCC Pin uses 3.3V or 5V

• GND Pin connects to GND

• Digital Pin can read from high or low only.

• Analog Pin can read a specific value

Pin Connections

Sensor

• D0 Pin → Pin 2

• GND → GND

• VCC → 5V

Green LED

• negative pin → GND

• positive pin → Pin 6

Red LED

• negative pin → GND

• positive pin → Pin 5

Buzzer

• negative pin → GND

• positive pin → Pin 12

Code

Using D0 Pin

int sensor=2;
int green=6;
int red=5;
int buzzer=12;

void setup()
{
  pinMode(sensor, INPUT);
  pinMode(green, OUTPUT);
  pinMode(red, OUTPUT);
  pinMode(buzzer, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  if (digitalRead(sensor) == 1 )
  {
    digitalWrite(green, LOW);
    delay(0);
    digitalWrite(red, HIGH);
    digitalWrite(buzzer, HIGH);
    delay(500);
    digitalWrite(red, LOW);
    digitalWrite(buzzer, LOW);
    delay(0);
    Serial.println("** Warning!!!!   Fire detected!!! **");
  }
  else
  {
    digitalWrite(green, HIGH);
    digitalWrite(red, LOW);
    digitalWrite(buzzer, LOW);
    Serial.println("No Fire detected");
  }
  delay(100);
}