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Arduino and ML8511 example

by shedboy71

The ML8511 measures the amount of ultra violet rayses contained in sunlight, and it is used for the equipment which displays the suntan by a ultra violet rays, the guidance for UV care of skin, etc

The sensor detects 280-390nm light most effectively. This is categorized as part of the UVB (burning rays) spectrum and most of the UVA (tanning rays) spectrum. It outputs a analog voltage that is linearly related to the measured UV intensity (mW/cm2). If your microcontroller can do an analog to digital signal conversion then you can detect the level of UV!

Its breakout time again



int UVsensorIn = A0; //Output from the sensor
void setup()
  pinMode(UVsensorIn, INPUT);
  Serial.begin(9600); //open serial port, set the baud rate to 9600 bps
void loop()
  int uvLevel = averageAnalogRead(UVsensorIn);
  float outputVoltage = 3.3 * uvLevel/1024;
  float uvIntensity = mapfloat(outputVoltage, 0.99, 2.9, 0.0, 15.0);
  Serial.print(" UV Intensity: ");
  Serial.print(" mW/cm^2"); 
//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;
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;




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