Arduino Helpers master
Utility library for Arduino
3.FilteredAnalogReadSerial.ino

3.FilteredAnalogReadSerial

This is an example of the AnalogMultiplex and the FilteredAnalog classes. It prints the filtered values of all 16 inputs of a multiplexers to the serial monitor.

Boards:
AVR, AVR USB, Nano Every, Nano 33 IoT, Nano 33 BLE, UNO R4, Pi Pico, Due, Teensy 3.x, ESP8266, ESP32

Connections

Optionally you can connect the enable pin as well, this is useful if you want to use multiple multiplexers with the same address lines and the same analog input. Otherwise, just connect the enable pin to ground.

If you are using a 3-bit multiplexer, like the CD74HC4051, you can uncomment the code specific to this multiplexer, and use only three address pins.

Behavior

Connect some potentiometers or other analog sensors to the 16 inputs of the multiplexer, and open the serial monitor (CTRL+SHIFT+M) or the serial plotter (CTRL+SHIFT+L). You should see all 16 signals printed or plotted.

Written by Pieter P, 09-04-2019
https://github.com/tttapa/Arduino-Helpers

#include <Arduino_Helpers.h> // Include the Arduino Helpers library
#include <AH/Containers/ArrayHelpers.hpp> // copyAs<>
// Instantiate a multiplexer
A0, // analog pin
{3, 4, 5, 6}, // Address pins S0, S1, S2, S3
// 7, // Optionally, specify the enable pin
};
// Alternatively, if you have a 3-bit mux:
// CD74HC4051 mux {
// A0,
// {3, 4, 5},
// // 7, // Optional
// };
// Convert the list of pins of the multiplexer to an array
// of FilteredAnalog objects.
auto filteredAnalogs = copyAs<FilteredAnalog<>>(mux.pins());
void setup() {
Serial.begin(115200);
mux.begin(); // Initialize multiplexer
}
void loop() {
// Loop over all FilteredAnalog objects in the array
for (auto &analog : filteredAnalogs) {
analog.update(); // actually read the analog value and filter it
Serial.print(analog.getValue());
Serial.print('\t');
}
Serial.println();
}
Dummy header file for Arduino builder.
A class for reading multiplexed analog inputs.
void begin() override
Initialize the multiplexer: set the pin mode of the address pins and the enable pin to output mode.