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--- gpio_inputs_-_button_led_control_using_an_interrupt [2016/08/09 23:00] – walkeradmin
+++ gpio_inputs_-_button_led_control_using_an_interrupt [2016/12/13 21:28] – external edit 127.0.0.1
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+The previous example of using a button to light an LED, everything worked fine, but our processor was at 100%, this needs fixing, so in this example instead of constantly polling and setting GPIO pins, we are using a interrupt where by we do nothing until a button is actually pressed.
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+Create a new file in the normal way ( you can download the python file {{ :led-button-i.zip |here}} to save time)
+\\
+    sudo nano LED-Button-i.py
     #import modules
-    import RPi.GPIO as GPIO    # This imports the GPIO libarary that allows the use of the GPIO pins,
+    import RPi.GPIO as GPIO    # This imports the GPIO library that allows the use of the GPIO pins,
-    import time                # This imports the time libarary (for delays among other things)
+    import time                # This imports the time library (for delays among other things)
                                # These libraries are built in to Raspbian.
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     #End
+\\
+Once you have your file saved, you can run it by using:
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+    sudo python LED-Button-i.py
+\\
+===== Example Output =====
+\\
+Here you can see the code running {{ :led-button-i.mp4 |(video)}}
+\\
+The main advantage using the **interrupt** is that my processor occupancy on the Pi Zero is now around 10% normal, and 14% when I press the button. That's much better than the previous constant 100%.
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