Portable luxmeter

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Geregistreerd: 01 Jul 2019, 17:01

Portable luxmeter

Berichtdoor michalchoma » 01 Jul 2019, 17:17

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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:

Afbeelding


Arduino Pro Mini 5V
Link: https://www.aliexpress.com/item/3290014 ... c7f0a9951a

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/3282862 ... c7f0a9951a

OLED display
Link: https://www.aliexpress.com/item/3283585 ... c7f0a9951a

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/3245305 ... c7f0a9951a


Li-Ion battery

3 - 4.2 V
Link: https://www.aliexpress.com/item/3280703 ... c7f0a9951a

18650 holder
Link: https://www.aliexpress.com/item/3265518 ... c7f0a9951a

Switch jumper
Link: https://www.aliexpress.com/item/3292600 ... c7f0a9951a

Dupont káble a pin headers
Link: https://www.aliexpress.com/item/3288083 ... c7f0a9951a

pin headers
Link: https://www.aliexpress.com/item/3269397 ... c7f0a9951a

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

Afbeelding


Code:
Code: Alles selecteren
// 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:
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Charging
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Night pollution?
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