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Engineering LibreTexts

Digital and analog signals

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  • Digital and analog signals-ulg0FWawaubfdGbu0NPcMg.jpg

    An analog signal is a change in voltage over time.

    A digital signal is a voltage that is set to on or off over time.

    The record player is analog and the CD player is digital.

    Here is a list of some sensors and the interfacing type.



    • Grove moister sensor
    • Grove air quality sensor


    • Grove infrared reflector sensor
    • Grove LED


    What are digital signals used for?



    The digital I/O (input/output) ports on the RPi the can be set to read an input high or low or output a high or low signal.



    An example of an output is to set the port high to turn on an LED or a relay.



    An example of a relay is shown here;










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