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ML8511

Intel Galileo

Intel Galileo and ML8511 UV sensor

by shedboy71
written by shedboy71

Connect to an ML8511 UV sensor to an Intel Galileo

The ML8511 is a UV sensor, which is suitable for acquiring UV intensity indoors or outdoors. The ML8511 is equipped with an internal amplifier, which converts photo-current to voltage depending on the UV intensity. This unique feature offers an easy interface to external circuits such as ADC. In the power down mode, typical standby current is 0.1A, thus enabling a longer battery life.

FEATURES
• Photodiode sensitive to UV-A and UV-B
• Embedded operational amplifier
• Analog voltage output
• Low supply current (300A typ.) and low standby current (0.1A typ.)
• Small and thin surface mount package (4.0mm x 3.7mm x 0.73mm, 12-pin ceramic QFN)

Parts List

Label Part Type
PART1 ML8511 UV Sensor Breakout
Part2 Intel Galileo Gen2

Layout

 

Code

[codesyntax lang=”cpp”]

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(uvIntensity);
  Serial.print(" mW/cm^2"); 
  Serial.println(); 
  delay(200);
}
 
//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);  
 
}
 

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;
}

[/codesyntax]

 

Testing

Open the serial monitor and you should see something like this

UV Intensity: 6.52 mW/cm^2
UV Intensity: 7.21 mW/cm^2
UV Intensity: 7.23 mW/cm^2
UV Intensity: 7.26 mW/cm^2
UV Intensity: 7.23 mW/cm^2
UV Intensity: 7.23 mW/cm^2
UV Intensity: 7.23 mW/cm^2
UV Intensity: 7.21 mW/cm^2
UV Intensity: 7.23 mW/cm^2
UV Intensity: 7.21 mW/cm^2
UV Intensity: 7.21 mW/cm^2
UV Intensity: 7.23 mW/cm^2
UV Intensity: 7.16 mW/cm^2

 

Links

ML8511 UVB UV Rays Sensor Breakout Test Module Detector Analog Output

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Arduino Sensors

Arduino and ML8511 UV light sensor

by shedboy71
written by shedboy71

Description

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 as this sensor is difficult to use otherwise for the normal hobbyist as it would require very good soldering skills due to the type of package

ML8511 module

ML8511 module

For those at are interested here is a schematic of this module

400px-GYML8511_SCH

Connections

  • 3.3V = 3.3V source
  • OUT = A0
  • GND = GND
  • EN = 3.3V

Code

[codesyntax lang=”cpp”]

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(uvIntensity);
Serial.print(” mW/cm^2″);
Serial.println();
delay(200);
}

//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);

}

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;
}
[/codesyntax]

 

Links

 
ML8511 UVB Ray Detection Module

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