Shoebox spectrophotometer APP
This is the app used in the article, 'Demonstrating Principles of Spectrophotometry by Constructing a Simple, Low-Cost, Functional Spectrophotometer Utilizing the Light Sensor on a Smartphone', published recently in the Journal of Chemical Education, http://pubs.acs.org/doi/10.1021/acs.jchemed.7b00548
There is an overview of how this can be done simply from a shoebox, a DVD and some building block on the YouTube link below.
Please note, your smartphone must have a light sensor for this app to work
Have fun!
Demonstration screencast: https://youtu.be/1NgzXpFDh7o