© Charles Bell 2016
Charles BellWindows 10 for the Internet of Things10.1007/978-1-4842-2108-2_11

11. Project 2: Measuring Light

Charles Bell
Warsaw, Virginia, USA
The projects that you’ve encountered thus far have used GPIO pins to turn LEDs on or off. But what if you wanted to control the brightness of an LED? Given that you can only turn pins on (high: 3.3V) or off (low: 0V), you have no way to send less power to the LED. Recall the lower the power, the dimmer the LED. If you consider solutions (or features) of devices that are sensitive to ambient light—such as a backlight keyboard—you may have noticed it changes brightness as the room becomes darker. In this project, you’re going to explore how such a feature works. That is, you’re going ...

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