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Environmental Monitoring with Arduino: Building Simple Devices to Collect Data About the World Around Us [Paperback]
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The tester uses a tricolor RGB LED to shine light of various mixed intensities of red, green, and blue. These RGB values can indeed create a full spectrum of perceived colors for the human eye. However, they CANNOT create the wavelengths of the intermediate colors; they are useless for direct spectral analysis of LED detectors. Besides being bad science,this bogus testing method invalidates the results of all the following chapters. Those chapters may be suitable for demonstrating how you would use a calibrated photometer to make atmospheric measurements, but the actual readings will be inaccurate.
After I try the gas detectors, I will update this review.
If you are looking for practical, useful, down to earth projects to do with your Arduino, this book is your destination.
One caveat, though. Figure 1-4 on page 8 shows an LED connected to pin 13 and ground, with no resistor. You should ALWAYS use a resistor between an LED and ground. Your LED's and your Arduino will both thank you, and both will enjoy a longer life.