November 2012
Intermediate to advanced
90 pages
1h 43m
English
Content preview from Atmospheric Monitoring with ArduinoBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 5. Gadget: LED Photometer
A photometer is a device that measures one or more qualities of light. Most photometers consist of an interference filter and a photo detector. The interference filter is a colored piece of plastic or glass that filters out nonessential colors, letting through only the precise wavelengths of light we’re interested in studying. A photo detector behind that filter monitors the intensity of the light that makes it through the filter.
In this gadget, LEDs replace both the interference filter and the photo detector. As Forrest Mims showed, LEDs are photodiodes: diodes that generate electrical current proportional to the light that falls on them, and they act as their own color filter. As you learned from your own experiments ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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