Nous recherchions tous les deux à créer un dispositif qui permettrait d’ouvrir un objet d’une manière « innovante » : par un signal vocal et par un signal de fréquence. Nous avons donc choisi de travailler ensemble afin de concevoir un meuble sécurisé.

- Bouton poussoir

- LED (1 verte, une orange, une rouge)

- Résistance (10 kiloohms, 220 Ohms, 1megaohm)

- Condensateur 100 uF

- Breadboard

- Servomoteur

- Buzzer piézo

- Connecteur mâle (3 broches)

- Micro CZN-15E

- Résisance 2.2 Kiloohm, 10 ohm, 100 Kiloohm, 10 Megaohm

- Servomoteur

- AOP LM358N (mode non inverseur)

- Arduino uno

- Condensateurs 100 microF, 47 nF

https://www.norwegiancreations.com/2017/08/what-is-fft-and-how-can-you-implement-it-on-an-arduino/

#include <Servo.h>
#include "arduinoFFT.h"

#define SAMPLES 128
#define SAMPLING_FREQUENCY 1000

arduinoFFT FFT = arduinoFFT();

unsigned int sampling_period_us;

  unsigned long microseconds;

double vReal[SAMPLES];

  double vImag[SAMPLES];

Servo myServo;

const int greenLED = 4 ;
const int redLED = 3 ;

int button = 13;

int cpt = 0;
int resetCpt = 0;
int resetCptMax = 4;

void setup() {

Serial.begin(9600);

pinMode(greenLED, OUTPUT);
pinMode(redLED, OUTPUT);
pinMode(button, INPUT);

myServo.attach(9);
myServo.write(0);

Serial.println("porte bloquée");

sampling_period_us = round(1000000*(1.0/SAMPLING_FREQUENCY));

}

void loop() {

  for(int i=0; i<SAMPLES; i++)
  {
      microseconds = micros();   
   
      vReal[i] = analogRead(A0);
      vImag[i] = 0;
   
      while(micros() < (microseconds + sampling_period_us)){
      }
  }

  FFT.Windowing(vReal, SAMPLES, FFT_WIN_TYP_HAMMING, FFT_FORWARD);
  FFT.Compute(vReal, vImag, SAMPLES, FFT_FORWARD);
  FFT.ComplexToMagnitude(vReal, vImag, SAMPLES);
  double peak = FFT.MajorPeak(vReal, SAMPLES, SAMPLING_FREQUENCY);

  Serial.println(peak);

  for(int i=0; i<(SAMPLES/2); i++)
  {
      /*View all these three lines in serial terminal to see which frequencies has which amplitudes*/
       
       Serial.print((i * 1.0 * SAMPLING_FREQUENCY) / SAMPLES, 1);
       Serial.print(" ");
       Serial.println(vReal[i], 1);    //View only this line in serial plotter to visualize the bins
  }

  delay(500);  
     

/* "LA = 440Hz" */

if ((cpt == 0) && (440 <= peak) && (peak <= 450)) {

  cpt = 1;
}

/* "RE = 292.7Hz" */

if (cpt == 1) {

  if ((288.0 <= peak) && (peak <= 299.0)) {
    cpt = 2;
  
}

else
{
  resetCpt ++;
    if (resetCpt > resetCptMax) {
      cpt = 0;
      }
  
  }

}

/* "SOL = 392.0Hz" */

if (cpt == 2) {

  if ((392.0 <= peak) && (peak <= 402.0)) {
    cpt = 3;
}

  else {
    resetCpt ++;

    if (resetCpt > resetCptMax) {
      cpt = 0;
    }
 
  }

}

if (cpt == 3){

myServo.write(180);
Serial.println("porte ouvert");

}
Serial.println(cpt);

if (cpt == 0) {

resetCpt = 0;
}
}