Wiring the ML8511 Ultra Violet Light Sensor on Microcontroller

This is the ML8511 Ultra Violate Light Sensor, which is suitable for acquiring UV intensity indoor or outdoor. The ML8511 equipped with internal amplifier which converts photo-current to voltage depending on UV intensity, and offers you an easy interface to external circuits.

Applications

Smart Phone, Watch, Weather Station, Navigation, Gaming, UV Radiation-Quantity Monitoring, Skin Care, Aging, Sterilization and Washing.
The ML8511 detects 280~390nm light most effectively and categorized as part of the UVB Burning Rays Spectrum and UVA Tanning Rays Spectrum.

Features

Photodiode sensitive to UVA and UVB
Embedded Operational Amplifier
Analog Voltage Output
Low Supply Current (300uA typ.) and low standby current (0.1uA typ.)
Small and thin surface mount package (4.0mm x 3.5mm x 0.73mm)

Required Components

Arduino Microcontrollers, Teensy (Teensyduino Integrated), ESP8266 (ESP8266 Arduino IDE Integrated), DigiSpark, STM32, AVR
ML8511 Breakout Board / ML8511 SMP Chip (See the Schematics Diagram & Refer to ML511 Datasheet)
Jumper Wire / DuPont Wire
Solder-less Breadboard
LCD Display (Optional)

Wiring Diagram

Source Code

int SensorPin = A1; //Output from the sensor
int REF = A2; //3.3V power on the Arduino board

void setup()
{
  Serial.begin(9600);
  pinMode(SensorPin, INPUT);
  pinMode(REF, INPUT);

  Serial.print("-----------------------------");
  Serial.println("14CORE | ML8511 TEST CODE");
  Serial.println("-----------------------------");
}

void loop()
{
  int uvLevel = averageAnalogRead(SensorPin);
  int refLevel = averageAnalogRead(REF);

  //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;
}

int SensorPin = A1; //Output from the sensor

int REF = A2; //3.3V power on the Arduino board

void setup()

{

Serial.begin(9600);

pinMode(SensorPin, INPUT);

pinMode(REF, INPUT);

Serial.print("-----------------------------");

Serial.println("14CORE | ML8511 TEST CODE");

Serial.println("-----------------------------");

}

void loop()

{

int uvLevel = averageAnalogRead(SensorPin);

int refLevel = averageAnalogRead(REF);

//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;

}

Downloads

Download ML8511 Datasheet | PDF

Wiring the ML8511 Ultra Violet Light Sensor on Microcontroller

One thought on “Wiring the ML8511 Ultra Violet Light Sensor on Microcontroller”

Quinten Duursema
at
Permalink

Hi, when I add this code to arduino, the following will be shown on the serial monitor:

ets Jan 8 2013,rst cause:4, boot mode:(3,6)

wdt reset
load 0x4010f000, len 3584, room 16
tail 0
chksum 0xb0
csum 0xb0
v2843a5ac
~ld
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One thought on “Wiring the ML8511 Ultra Violet Light Sensor on Microcontroller”

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