Portable Luxmeter




This project is about making portable luxmeter. It can be used in schools, where children can measure different kinds of light sources.
Functions:

1. measure intensity of light in lux.




2. calculate solar irradiation from lux to watts/m2 (factor 112)

3. charging battery using USB port

Total cost is around 13 $ without case. Luxmeter take 15 mA, so it will works long time on one Li-Ion battery.

Step 1: BOM

  • For project you need this components(affiliate links, if you want to support me):

Arduino Pro Mini 5V

MAX44009

  • Wide 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

OLED display

  • 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
  • Link

TP4056

  • need USB to micro USB cable for charging
  • input 5V
  • Link

Li-Ion battery

18650 holder

Switch jumper

Cables and header

Step 2: Circuit

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

Arduino – MAX44009 (same for OLED display)

A4 – SDA

A5 – SCL

VCC – VIN

GND – GND

TP4056 – Arduino Pro Mini
OUT+ – VCC

Arduino – battery

VCC – plus terminal (max 5 V for Arduino 5V)

Arduino – switch jumper

GND – first switcher

TP4056 – switch jumper

OUT – – second switcher

Battery – switch jumper

minus terminal – first and second switcher

Read more: Portable Luxmeter




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