Portable luxmeter




I decided to make luxmeter, which has basic functions:

1. measure lux from 0 to 188000 lux

2. calculate watts/m2

3. charging using USB cabel via TP4056 board


Basic sensor is MAX44009, which measure lux. I use Arduino Pro Mini as microcontroller.

Totally it cost cca 13 $. Case is homemade.

Power consumption - 15 mA.


for more info: https://www.instructables.com/id/Portable-Luxmeter/


BOM:




BOM:

Arduino Pro Mini 5V

Link: https://www.aliexpress.com/item/329...&terminal_id=6f16b2047f114c94a07652c7f0a9951a


MAX44009


0.045 Lux to 188,000 Lux Range

VCC = 1.7V to 3.6V

ICC = 0.65µA Operating Current

-40°C to +85°C Temperature Range

Link

https://www.aliexpress.com/item/328...&terminal_id=6f16b2047f114c94a07652c7f0a9951a


OLED display

Link: https://www.aliexpress.com/item/328...&terminal_id=6f16b2047f114c94a07652c7f0a9951a


Diagonal Screen Size:0.96"


Number of Pixels:128 x 64


Color Depth:Monochrome (Yellow&Blue)


Dimension:27.8 x27.3x 4.3 mm


Working Voltage: 3.3~ 5V DC


Power: 0.06W


MaxViewing Angle: >160 Degree


Duty:1/32Brightness ( cd/m2):150 (Typ) @ 5V


Interface: I2C




TP4056

input 5V

Link: https://www.aliexpress.com/item/324...&terminal_id=6f16b2047f114c94a07652c7f0a9951a



Li-Ion battery


3 - 4.2 V

Link: https://www.aliexpress.com/item/328...&terminal_id=6f16b2047f114c94a07652c7f0a9951a


18650 holder

Link: https://www.aliexpress.com/item/326...&terminal_id=6f16b2047f114c94a07652c7f0a9951a


Switch jumper

Link: https://www.aliexpress.com/item/329...&terminal_id=6f16b2047f114c94a07652c7f0a9951a


Dupont cable a pin headers

Link: https://www.aliexpress.com/item/328...&terminal_id=6f16b2047f114c94a07652c7f0a9951a


pin headers

Link: https://www.aliexpress.com/item/326...&terminal_id=6f16b2047f114c94a07652c7f0a9951a



Circuit:

You need of course 5V Arduino to power it with Li-Ion battery (4,2 V!)




Code:
  // OLED display TWI address

  #define OLED_ADDR   0x3C

  Adafruit_SSD1306 display(-1); // restart display with reset button on arduino


  void setup()


  {


  Lux.Begin(0, 188000);

  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);

  display.clearDisplay();

  display.display();


  // display a line of text

  display.setTextSize(1);

  display.setTextColor(WHITE);

  display.setFont(&FreeSerif9pt7b);

  display.setCursor(1,15);

  display.print("MAX44009");

  display.display();

  }


  void loop()


  {

  lux=Lux.GetLux();  // get luxs

  watts =Lux.GetWpm();  // get watts/m2, only for SUN source


  display.fillRect(1, 20, 100, 100, BLACK); // create black rectangle on values position

  display.setCursor(1,40);

  display.print(lux);

  display.setCursor(80,40);

  display.print("lux");

  display.setCursor(1,60);

  display.print(watts);

  display.setCursor(80,60);

  display.print("W/m");

  display.setCursor(115,55);

  display.print("2");

  display.display();

  delay(1000);

  }


Photos:













Charging





Night pollution?


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Author
Michal Choma
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