Grove - UV Sensor
Introduction
3.3V 5.0V Analog
The Grove – UV Sensor is used for detecting the intensity of incident ultraviolet(UV)
radiation. This form of electromagnetic radiation has shorter wavelengths than visible
radiation. The Grove - UV Sensor is based on the sensor GUVA-S12D which has a
wide spectral range of 200nm-400nm. The module outputs electrical signal which
varies with the UV intensity, which gives your suggestion if it is a good idea to beach
today.
Features
• High stability
• Good Sensitivity
• Low power cons umptio n
• Schottky type photodiode sensor
• Wide response range
• Grove Interface
Tip
More details about Grove modules please refer to Grove System
Specifications
Item
Min
Typical
Max
Unit
Operating Voltage
3.0
5.0
5.1
VDC
Current
0.31
mA
Output Voltage
mV
Response
wavelength
Working
Temperature
℃
Raspberry
Pi
LinkIt
ONE
240 ~ 370 nm
-30 ~ 85
Platforms Supported
Arduino Wio BeagleBone
Caution
The platforms mentioned above as supported is/are an indication of the module's hardware or theoritical compatibility. We only
provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library /
demo code for all possible MCU platforms. Hence, users have to write their own software library.
Usage
UV sensors are used in many different applications. Examples include
pharmaceuticals, automobiles, and robotics. UV sensors are also used in the printing
industry for solvent handling and dyeing processes. In addition, UV sensors are also
used in the chemical industry for the production, storage, and transportation of
chemicals.
The fact of the UV sensor work is: In sunlight, the UV index and Photocurrent are a
linear relationship.
About our Grove - UV Sensor, we have converted Photocurrent to corresponding
voltage value collected by Arduino/Seeeduino. The output voltage and the UV index
is linear:
illumination intensity = 307 * Vsig
where: Vsig is the value of voltage measured from the SIG pin of the Grove interface,
unit V. illumination intensity unit: mW/m2 for the combination strength of UV light with
wavelength range: 240nm~ 370nm
Note
To calculate the UV index value, please refer to US EPA. It is hard to say that the
measurement from this sensor can be converted to the EPA standard UV index, but can be
estimated roughly.
UV Index = illumination intensity / 200
Example
• Connect it to A0 port of Grove - Base Shield.
• Plug the Grove - Base Shield into Arduino/Seeeduino and connect them to PC using a
USB cable.
• The demo code is shown below.
// modified by Victor
// to calculate UV index directly
void setup(){
Serial.begin(9600);
}
void loop()
{
int sensorValue;
long sum=0;
for(int i=0;i<1024;i++)// accumulate readings for 1024 times
{
sensorValue=analogRead(A0);
sum=sensorValue+sum;
delay(2);
}
long meanVal = sum/1024; // get mean value
Serial.print("The current UV index is:");
Serial.print((meanVal*1000/4.3-83)/21);// get a detailed calculating expression for UV index in
schematic files.
Serial.print("\n");
delay(20);
}
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