tinkercad low pass filter

int d = 1000;

int count = 0;

float count_max = 3;

  

void setup()

{

  DDRD = 0b10000000; //pin 7 as output

  Serial.begin(9600);

}

void loop()

{

  PORTD ^= 0b10000000; //toggle pin 7

  Serial.println(d);

  delay(d);

  

  count++;

  if(count>count_max){

  d = d*0.9;

    count = 0;

    count_max = count_max * 1.11;

    Serial.println(count_max);

  }

  

  if(d<1){d=1000;}

}

reference:

https://www.electronics-tutorials.ws/filter/filter_5.html