From the course: Raspberry Pi: GPIO
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Which GPIO pins can be used for input
From the course: Raspberry Pi: GPIO
Which GPIO pins can be used for input
- [Instructor] In a previous chapter, we buzzed through an overview of the GPIO pins. Let's do a deep dive on GPIO input pins. Raspberry Pi inputs are digital. That is to say they only understand on or off. To signal on, feed an input pin with 3.3 volts DC. To signal off, feed it zero volts DC. There are no analog to digital pins available on the Raspberry Pi, although there are integrated circuits that can be used for this purpose. Be careful about the voltage you feed a Raspberry Pi input pin. Design your circuits to produce no more than 3.3 volts DC and no less than zero volts DC. If you're getting close to five volts or above, you run the risk of burning out your Raspberry Pi. In an upcoming video, I'll describe the use of Zener diodes to prevent this. Finally, input pins can be configured to generate interrupts, although this is language specific. In a future video, I'll describe how to implement GPIO interrupt…
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