Connection Diagram for Active Low Push Button

In the terminal, we will demonstrate how to activate and use a GPIO pin as

an input configured as an active high.

First, navigate to the GPIO directory on the Edison.

cd /sys/class/gpio 

Select the GPIO pin to enable. In this case let us use GPIO 14.

echo 14 > export 

Navigate to the newly created GPIO directory.

cd gpio14 

If you type “ls”, you should see a bunch of variables.

active_low  direction   power       uevent 

device      edge        subsystem   value 

Let’s set the “direction” of the port to output.

echo in > direction 

To confirm this, we will “cat” the value.

cat direction 

You should see the “in” in the command line. Now the device is configured

as an input. “value” is where the status of the pin is set, 1 for high, 0 for low.

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