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Internet of Things with Python by Gastón C. Hillar

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Using interrupts to detect pressed pushbuttons

Previously, we analyzed the advantages of disadvantages of reading digital inputs with polling as in the previous examples compared with the usage of interrupts for the same task. If we keep any of the pushbuttons pressed for a long time, the code behaves as if the pushbutton was pressed many times. Now, we don't want this situation to happen, and therefore, we will use interrupts instead of polling to detect when the pushbuttons are pressed.

Before we start editing our code, it is necessary to make changes to our existing wirings. The problem is that not all the GPIO pins support interrupts. In fact, pins number 0 and 1 don't support interrupts and we have our pushbuttons connected to them. In Chapter ...

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