GY-ML8511 GY-8511 Ultraviolet Sensor Module UV Sensor วัดแสง UV รังสีอัลตราไวโอเลต

int UVOUT = A0; //Output from the sensor

int REF_3V3 = A1; //3.3V power on the Arduino board

 

void setup(){

  Serial.begin(9600);

  pinMode(UVOUT, INPUT);

  pinMode(REF_3V3, INPUT);

  Serial.println("ML8511 example");

}

 

void loop(){

  int uvLevel = averageAnalogRead(UVOUT);

  int refLevel = averageAnalogRead(REF_3V3);

 

  //Use the 3.3V power pin as a reference to get a very accurate output value from sensor

 

  float outputVoltage = 3.3 / refLevel * uvLevel;

  float uvIntensity = mapfloat(outputVoltage, 0.99, 2.8, 0.0, 15.0); //Convert the voltage to a UV intensity level

  Serial.print("output: ");

  Serial.print(refLevel);

  Serial.print("ML8511 output: ");

  Serial.print(uvLevel);

  Serial.print(" / ML8511 voltage: ");

  Serial.print(outputVoltage);

  Serial.print(" / UV Intensity (mW/cm^2): ");

  Serial.print(uvIntensity);

  Serial.println();

  delay(100);

}

 

//Takes an average of readings on a given pin

 

//Returns the average

 

int averageAnalogRead(int pinToRead)

{

  byte numberOfReadings = 8;

  unsigned int runningValue = 0; 

 

  for(int x = 0 ; x < numberOfReadings ; x++)

    runningValue += analogRead(pinToRead);

    runningValue /= numberOfReadings;

    return(runningValue);  

}

 

//The Arduino Map function but for floats

//From: http://forum.arduino.cc/index.php?topic=3922.0

 

float mapfloat(float x, float in_min, float in_max, float out_min, float out_max){

  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;

}