Programming the Photon: Getting Started with the Internet of Things (Tab) by Christopher Rush

Author:Christopher Rush [Rush, Christopher]
Language: eng
Format: epub, azw3
ISBN: 9780071847063
Publisher: McGraw-Hill Education
Published: 2016-04-07T22:00:00+00:00

Reading a Potentiometer

The easiest analog sensor that we can read is a simple potentiometer (POT). You can find these in most electronic kits, and they are fairly common and inexpensive; you can even salvage these from old consumer electronics such as stereos, speakers, thermostats, and more. A potentiometer is a variable-voltage divider that looks like a dial knob, as shown in Figure 5.5. They can vary in size and shape, but they all have one thing in common, which is that they all use three pins. In our case, you connect one of the outer pins to ground and the other outer pin to 3V3. Potentiometers are also symmetrical, which means it does not matter how you connect the ground and 3V3, as long as it is not the middle pin. The middle pin connects to the analog pin on the Photon, as shown in Figures 5.5 and 5.6.

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