void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

int T=10; // ms
int n=0;
float f=0;
float y_=0;
float A=0;

void loop() {
  // put your main code here, to run repeatedly:

  float v=1000*sin(2*PI*1*n*T/1000);
  float y=v+f;
  float x=(y-y_)*1.5;
  f=f*0.99+x*0.01*2;

  y_=y_*0.99+x*0.01*A;

  float e=y-y_;
  A+=0.00000000001*e*x;

  Serial.print(v); Serial.print(' ');
  Serial.print(f); Serial.print(' ');
  Serial.print(y); Serial.print(' ');
  Serial.print(x); Serial.print(' ');
  Serial.print(A*1000); Serial.print(' ');
  Serial.println();

  n++;  
  delay(T); // this speeds up the simulation
}