### Project 13 Flame Sensor

![](media/image-20251125095604598.png)

**1.Introduction**
This flame sensor can be used to detect fire or other lights whose wavelength stands at 760 nm ~ 1100 nm. In the fire-fighting robot game, the flame plays an important role in the probe, which can be used as the robot's eyes to find fire source.

**2.Specification**

- Supply Voltage: 3.3V to 5V
- Detection range: 20cm (4.8V) ~ 100cm (1V)
- Rang of Spectral Bandwidth: 760nm to 1100nm
- Operating temperature: -25℃to 85℃
- Interface: digital
- Size: 44*16.7mm
- Weight: 4g

**3.Connection Diagram**

![](media/image-20251125174320731.png)

**4.Sample Code**

```c
const int flamePin = 2;     // the number of the flame pin
const int ledPin =  13;      // the number of the LED pin
// variables will change:
int State = 0;         // variable for reading status

void setup() 
{
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);      
  // initialize the pushbutton pin as an input:
  pinMode(flamePin, INPUT);     
}

void loop()
{
  // read the state of the value:
  State = digitalRead(flamePin);
  if (State == HIGH) 
  {     
    // turn LED on:    
    digitalWrite(ledPin, HIGH);  
  } 
  else 
  {
    // turn LED off:
    digitalWrite(ledPin, LOW); 
  }
}
```