Nafisa Anjum
Published © CC BY

Mini Digital LUX Meter

Sometime I need to measure the exposure of light but a lux meter costs around $30, I made it with a BH1750 sensor which cost me around $10.

IntermediateFull instructions provided3 hours499
Mini Digital LUX Meter

Things used in this project

Hardware components

BH1750 light intensity module
×1
OLED 0.96 inch I2C IIC Interface OLED Screen Display 4 Pin (White)
×1
Breadboard (generic)
Breadboard (generic)
×1
Jumper wires (generic)
Jumper wires (generic)
×1
Node Mcu
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
Solder Wire, Lead Free
Solder Wire, Lead Free

Story

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Custom parts and enclosures

code

Schematics

Circuit diagram

Code

BH1750

Arduino
#include <BH1750FVI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.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);

// Create the Lightsensor instance
BH1750FVI LightSensor(BH1750FVI::k_DevModeContLowRes);

void setup() 
{
  Wire.begin(2,0);
  Serial.begin(115200);
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  

  LightSensor.begin();  
}

void loop()
{
 float lux = LightSensor.GetLightIntensity();
 display.clearDisplay();
  display.setTextSize(2);             // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE);        // Draw white text
  display.setCursor(0,0);             // Start at top-left corner
  display.println(F("Light :"));
   display.println(lux);
    display.println(F("LUX"));
    display.display();
  
  delay(500);
}

Credits

Nafisa Anjum

Nafisa Anjum

2 projects • 2 followers
Computer science student who loves electronics

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