How does an analog multiplexer work on a microcontroller?

How does an analog multiplexer work on a microcontroller?

The functionality of the CD74HC4051 as analog multiplexer is easy explained in two steps: The multiplexer gets the select line signal from the 3 digital outputs of the microcontroller. If the enable state is set to LOW, the corresponding analog input (A0…A7) is connected with the analog output (A)

How many analog pins are needed for a multiplexer module?

Multiplexer Module is a micro chip that requires 1 Analog Pin and 2 to 4 Digital Pins to allow the micro controller to monitor more Analog Pins for sensor readings. The requirement of 1 Analog Pin is actually the output pin shared among all the extension Analog Pins.

How is an analog signal converted to a numeric value?

However if the analog signal is converted into a numeric value then it can be processed and reasoned about by the microprocessor just like any other number. The ADC is the key to reading analog signals and voltages with a microprocessor. Typically development boards have one or more built-in analog to digital converters.

What should the ADC be on an analog converter?

If you twist the knob of the potentiometer all the way to the other extreme near 3.3 volts and read its value: You should see a very high value near 65000. As the voltage to the analog input increased the ADC value increased too! As an aside if you have a multimeter try using it to measure the voltage output from the potentiometer.

What are the pins for an analog multiplexer?

First we have to define the connected pins. As mentioned before we connected the 3 digital pins D3, D2, D1 as well as the analog input A0. For the digital pins we create an array to loop through the pins easily during later stages in the code.

What can I do with a 16 channel multiplexer?

This multiplexer can be used to select from 16 analog inputs. There are four S0-3 pins, which by giving appropriate values, one of the analog inputs is set as the output in the SIG pin. You can see the pinout of this module in the image below.

How does an analog PID controller control speed?

An analog PID controller with 3 potentiometers to control PID parameters. This takes an analog signal given from a point and sets the point as the zero position. This part then outputs an analog signal which controls the speed of the motor.

How are the inputs and outputs of a multiplexer related?

In my opinion the best explanation of a multiplexer is a big switch which connects all inputs with one output. Which input is connected to the output is defined by the state of the select lines pins. Because only one input is connected to the output, all other lines loose the connection.

How to increase the number of analog inputs with an analog?

The 35 pages Microcontroller Datasheet Playbook contains the most useful information of 14 Arduino, ESP8266 and ESP32 microcontroller boards. Before we start with the practical example, let us quickly summarize the data sheet of the CD74HC4051.