Getting Started with Sensors by Kimmo Karvinen & Tero Karvinen

Author:Kimmo Karvinen & Tero Karvinen
Language: eng
Format: epub
Tags: COMPUTERS / Programming / Open Source
ISBN: 9781449367039
Publisher: Maker Media, Inc
Published: 2014-08-25T04:00:00+00:00

$ cat /sys/class/gpio/gpio3/value 1

Because you weren’t pressing the button, the internal pull-up resistor pulled GPIO 3 to 3.3 V, HIGH, so you got the value 1.

Next, hold down the button and read the value again (for a cool trick, you can recall the previous command by pressing the up arrow, so you don’t have to type it again):

$ cat /sys/class/gpio/gpio3/value 0

Well done! You can now read values from digital sensors. Even though you’ll soon practice with another digital sensor, the program will be very similar to this one.

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