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UV Sensor

Arduino Due

Arduino Due and VEML6070 UV sensor

by shedboy71
written by shedboy71

In this example we look at an VEML6070 UV sensor and connect it to an Arduino Due

Lets take a look at the sensor first

The VEML6070 is an advanced ultraviolet (UV) light sensor with I2C protocol interface and designed by the CMOS process. It is easily operated via a simple I2C command. The active acknowledge (ACK) feature with threshold windows setting allows the UV sensor to send out a UVI alert message. Under a strong solar UVI condition, the smart ACK signal can be easily implemented by the software programming. VEML6070 incorporates a photodiode, amplifiers, and analog / digital circuits into a single chip. VEML6070’s adoption of FiltronTM UV technology provides the best spectral sensitivity to cover UV spectrum sensing. It has an excellent temperature compensation and a robust refresh rate setting that does not use an external RC low pass filter.

VEML6070 has linear sensitivity to solar UV light and is easily adjusted by an external resistor. Software shutdown mode is provided, which reduces power consumption to be less than 1 μA. VEML6070’s operating voltage ranges from 2.7 V to 5.5 V.

You can find out about the UV index at the following link – https://en.wikipedia.org/wiki/Ultraviolet_index

The easiest way to work with this sensor is to buy a module – this is a picture of the module that I bought

Layout

 

 

arduino due and VEML6070 layout

arduino due and VEML6070 layout

 

 

Code

I used the Adafruit library – https://github.com/adafruit/Adafruit_VEML6070

[codesyntax lang=”cpp”]

#include <Wire.h>
#include "Adafruit_VEML6070.h"

Adafruit_VEML6070 uv = Adafruit_VEML6070();

void setup() 
{
  Serial.begin(9600);
  Serial.println("VEML6070 Test");
  uv.begin(VEML6070_1_T);  // pass in the integration time constant
}


void loop() 
{
  Serial.print("UV light level: "); 
  Serial.println(uv.readUV());
  delay(1000);
}

[/codesyntax]

 

Output

Open the serial monitor – just as a note in my example I was indoors

VEML6070 Test
UV light level: 0
UV light level: 0
UV light level: 0
UV light level: 0
UV light level: 0
UV light level: 0

 

Link

You can pick up one of these sensors for about $2.50

UV sensor module VEML6070 UV Sensitivity Detection Sensor for Arduino

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Arduino Due

Arduino Due and GUVA-S12SD UV Sensor example

by shedboy71
written by shedboy71

The GUVA-S12SD UV Sensor chip is suitable for detecting the UV radiation in sunlight. It can be used in any application where you want monitor for the amount of UV light and is simple to connect to any microcontroller. I recently noticed that some sellers had little modules for this sensor at a reasonable price so decided to purchase one

The module, with a typical UV detection wavelength of 200 – 370nm, outputs a calibrated analog voltage which varies with the UV light intensity so basically all you need to do is connect this to an ADC input and read in the value.

This value ties in with the UV index, this looks something like this

 

Connection

The connections are straightforward and described below, I used 3.3v from my Arduino Due. This was mainly for compatibility with other development boards but the module works with 5v.

1. GND: 0V (Ground)
2. VCC: 3.3V to 5.5V
3. OUT: 0V to 1V ( 0 to 10 UV Index)

 

Layout

As said its a simple layout but here you go

arduino due and GUVA-S12SD

arduino due and GUVA-S12SD

 

 

Code

Simple code example that reads the value at A0 and outputs the results via the serial monitor, if you use 5v rather than 3.3v then you will need to change the 3.3 in the following line

sensorVoltage = sensorValue/4095*3.3;
[codesyntax lang="cpp"]
void setup() 
{ 
  Serial.begin(9600);
} 

void loop() 
{  
  float sensorVoltage;   
  float sensorValue;   
  sensorValue = analogRead(A0);  
  sensorVoltage = sensorValue/4095*3.3;  
  Serial.print("sensor reading = ");  
  Serial.print(sensorValue);  
  Serial.println("");  
  Serial.print("sensor voltage = ");  
  Serial.print(sensorVoltage);  
  Serial.println(" V");  
  delay(1000);
  
}
[/codesyntax]

Testing

Open the serial monitor and look at the readings

sensor reading = 129.00
sensor voltage = 0.10 V
sensor reading = 128.00
sensor voltage = 0.10 V
sensor reading = 75.00
sensor voltage = 0.06 V
sensor reading = 2.00
sensor voltage = 0.00 V
sensor reading = 3.00
sensor voltage = 0.00 V
sensor reading = 125.00
sensor voltage = 0.10 V

If you look at the image earlier that corresponds to UV index of 0 which is a relief because I tested this indoors

 

Links

keyestudio GUVA-S12SD 3528 Ultraviolet Sensor for Arduino

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