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http://www.instructables.com/id/Arduino-Spectrophotometer/
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Arduino Spectrophotometer
by jim_chung on December 27, 2015
Table of Contents
Arduino Spectrophotometer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Intro:   Arduino Spectrophotometer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Step 1:   Materials  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Step 2:   Schematic circuit diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Step 3:   Arduino Sketch  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
File Downloads  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 4:   Red tape results  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Related Instructables  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
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Comments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

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by jim_chung on December 27, Arduino Spectrophotometer
- Arduino Spectrophotometer Table of Contents
  - Intro: Arduino Spectrophotometer
  - Step 1: Materials
  - Step 2: Schematic circuit diagram
  - Step 3: Arduino Sketch
    - File Downloads
  - Step 4: Red tape results
  - Related Instructables
- Advertisements
  - Comments

Intro: Arduino Spectrophotometer

I'm an amateur astronomer tasked with giving an educational talk to fellow amateur astronomers about how to clean optical surfaces like the lenses of eyepieces and telescopes. I wanted to run a small experiment cleaning some uniform glass samples (that had been coated with dust and mineral deposits) with a variety of commercial and homemade cleaning solutions. But how to quantify the efficacy of the cleaning process? I decided I could run the glass samples before and after the cleaning process through a spectrophotometer and compare transmission profiles. And one can buy a used student spectrophotometer these days on eBay for a ridiculously low price .... but we all have way too much stuff that we buy, use once and then stash away. The solution would be to build an Arduino Spectrophotometer, a simple one that did not involve the complex mechanics of a rotating prism (or diffraction grating) and optical slit to deliver monochromatic light to the sample.

Step 1: Materials

Arduino UNO RGB led light dependent resistor (photocell) 3 270 ohm resistors 2 10k ohm resistors breadboard push button switch

Step 2: Schematic circuit diagram

The build is extremely simple because the wavelength of visible light being emitted is entirely digitally controlled by the RGB led. By altering the pulse width modulation values form the UNO to the RGB led you can deliver the primary red, green, blue colors and all the intermediary colors. I tried to keep the level of illumination constant by making the sum of all RGB outputs to a value of 210.

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