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Digital and analog signals

Last updated

May 24, 2021
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- Setting up the 1-wire interface for the RPi
- Controllable Four Outlet Power Relay

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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.

Analog:

Grove moister sensor
Grove air quality sensor

Digital:

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;

https://eng.libretexts.org/Courses/University_of_Arkansas_Little_Rock/IFSC_4399_-_The_Internet_of_Things_(IoT)/Controllable_Four_Outlet_Power_Relay

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