If you have used the GPIO Python library before, you have seen that to turn on a GPIO pin you would use GPIO.output(pin, True), and to turn it off you would type GPIO.output(pin, False). The key here is the True and False. Just like a light switch, a GPIO pin can only be completely on, or completely off. This is called digital because the Raspberry Pi sends a binary signal of 1 or 0 to the GPIO pins, for on and off respectively, just like computers operate only in binary. But, what if you want something in between? Something not fully on, but not off, either. Like,...
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