Filters for sensor

Other Hardware Sensors
1

Hello dear Arduino community,

I would like to test a Butterworth filter which I found from the gitHub-Website (Link) with my sensor, but unfortunately when I compile the code the following error occurs:

AH/Timing/MillisMicrosTimer.hpp: No such file or directory

I have already downloaded the zip.file and installed it manually as library, but the same error occurs.

Here is the example Butterworth code:

/**
 * Example of Butterworth filter.
 * 
 * @boards  AVR, AVR USB, Nano 33 IoT, Nano 33 BLE, Due, Teensy 3.x, ESP8266, ESP32
 * 
 * @see <https://tttapa.github.io/Pages/Mathematics/Systems-and-Control-Theory/Analog-Filters/Butterworth-Filters.html>
 * 
 * Written by PieterP, 2019-11-12  
 * https://github.com/tttapa/Arduino-Filters
 */

#include <Filters.h>

#include <AH/Timing/MillisMicrosTimer.hpp>
#include <Filters/Butterworth.hpp>

void setup() {
  Serial.begin(115200);
}

// Sampling frequency
const double f_s = 100; // Hz
// Cut-off frequency (-3 dB)
const double f_c = 25; // Hz
// Normalized cut-off frequency
const double f_n = 2 * f_c / f_s;

// Sample timer
Timer<micros> timer = std::round(1e6 / f_s);

// Sixth-order Butterworth filter
auto filter = butter<6>(f_n);

void loop() {
  if (timer)
    Serial.println(filter(analogRead(A0)));
}

Thank you very much for your time and help in advance

Best regards

Kosta

2

Why not use the micros() timer built in to Arduino?

3

Hello jremington,

how would the micros() timer built in help me with the Butterworth filter? And if it can help me, where can I find in Arduino IDE?

Best regards

Kosta

4 
unsigned long start = micros();
... code to be timed ...
Serial.println(micros() - start);
5

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