Published May 28, 2021 © GPL3+

Arduino UV index meter

UV index meter using GUVA-S12SD.

BeginnerFull instructions provided1 hour10,499

Things used in this project

Hardware components

Arduino Nano R3

0.96" I2C OLED Display

GUVA-S12SD UV sensor

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Breadboard, 270 Pin

Story

In this project I'll show you how to make a UV index meter which can show the UV index and the UV state using GUVA-S12SD UV sensor.

About the Sensor

GUVA-S12SD is a Gallium Nitride Based Schottky-type Photodiode. It has a typical UV detection wavelength of 240-370nm(which covers UVB and most of UVA spectrum). It outputs a calibrated analog voltage which varies with the UV light intensity. So, we can read the analog value via Arduino ADC.

1 / 2

Making This Project

Connection:

ARDUINO A0 to GUVA-S12SD SIG
ARDUINO A4 to OLED SDA
ARDUINO A5 to OLED SCL
ARDUINO 5V to GUVA-S12SD and OLED VCC
ARDUINO GND to GUVA-S12SD and OLED GND

Coding:

GUVA-S12SD sensor outputs analog voltage so we have to read the data using analogRead() Command. Then I calculated the output voltage from the sensor, sensorVoltage = sensorValue/1024*5.0;. After that I calculated the UV index by dividing the sensor voltage by 0.1 as per the datasheet of the sensor, UV_index= sensorVoltage/0.1; Then Using the data from Wikipedia I make some condition for the UV state. And display the UV index and UV state on the OLED display.

Library needed:

Adafruit_SSD1306.h
Adafruit_GFX.h

Code

UV_index_meter_code

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeSans9pt7b.h>
#include <Fonts/Org_01.h>
#include <Fonts/FreeMonoBoldOblique12pt7b.h>
#include <Fonts/FreeMonoBoldOblique9pt7b.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define bitmap_height   128
#define bitmap_width    64
static const unsigned char PROGMEM bitmap[] =
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};


void uv_index()
{

  float sensorVoltage; 
  float sensorValue;
  int UV_index;
  String quality =""; 
  sensorValue = analogRead(A0);
  sensorVoltage = sensorValue/1024*5.0;
  UV_index= sensorVoltage/0.1;


 //condition for UV state
 if(UV_index<=2){ 
   quality = "   LOW ";
  }

  else if(UV_index > 2 && UV_index <=5){
   quality = "   MOD ";
  }

  else if(UV_index>5 && UV_index<=7){
   quality = "   HIGH ";
  }

  else if(UV_index>7 && UV_index<=10){
   quality = "VERY HIGH";

  }

  else{
   quality = " EXTREME ";
  }

  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(2);
  display.setCursor(16, 6);
  display.setFont(&Org_01);
  display.println("UV INDEX");
  display.setCursor(53, 35);
  display.setTextSize(1);
  display.setFont(&FreeMonoBoldOblique12pt7b);
  display.println(UV_index);
  display.setTextSize(2);
  display.setCursor(10, 55);
  display.setFont();
  display.println(quality);   
  display.display();  
  delay(1000);

}

void setup() {
  Serial.begin(9600);
  
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
  }
  showBitmap();
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.setCursor(15, 9);
  display.setFont(&FreeMonoBoldOblique12pt7b);
  display.println("INDEX");
  display.setTextSize(1);
//    display.setFont();
  display.setCursor(55, 37);
  display.setFont(&FreeSans9pt7b);
  display.println("meter");
  display.display();
  delay(1000);
}

void loop() {
  display.clearDisplay();
  uv_index();

}

void showBitmap(void) {
  display.clearDisplay();

  display.drawBitmap(5, 0, bitmap, bitmap_height, bitmap_width, WHITE);
  display.display();
  delay(2000);
}

Credits

Abid hossain

4 projects • 47 followers

Student of BSEEE in United International University, Bangladesh. Loves to learn and make new stuff.

Arduino UV index meter

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

About the Sensor

Making This Project

Schematics

UV_meter_scm

Code

UV_index_meter_code

Credits

Abid hossain

Comments

Embed the widget on your own site

Arduino UV index meter

Arduino UV index meter

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

About the Sensor

Making This Project

Schematics

UV_meter_scm

Code

UV_index_meter_code

Credits

Abid hossain

Comments

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