#define pulse_ip 7
int ontime,offtime,duty;
float freq,period;
int outputpin=9; /* Assign symbolic name outputpin to D9 PWM pin of Arduino */

void setup()
{
  Serial.begin(9600); 
  pinMode(outputpin, OUTPUT); /* set as a output put */
  TCCR1A=_BV(COM1A1)|_BV(COM1B1); /* set Fast PWM Mode */
  TCCR1B=_BV(WGM13)|_BV(CS11); /* Activate PWM Phase, frequency correction Mode */
}

void loop()
{
  float frequency=0; /* initially set frequency to zero */
  float count=10000;
  float count2=0;
  float readinput=0;
  
  while(1)
  {
    ontime = pulseIn(pulse_ip,HIGH);
    offtime = pulseIn(pulse_ip,LOW);
    period = ontime+offtime;
    freq = 1000000.0/period;
    duty = (ontime/period)*100; 
    Serial.print(freq);
    Serial.println("Hz");

    ICR1=count;
    count2=2*8*count;
    frequency= int(16000000/count2);
    OCR1A=int(count/2);
    
    count=10000;//10=100,000Hz, 1000=1000Hz, 5000=200Hz, 10000=100Hz, 20000=50Hz
    readinput=analogRead(A0);
    ///readinput=(readinput/0.0113);https://microcontrollerslab.com/arduino-pwm-tutorial-generate-fix-and-variable-frequency-signal/
    readinput=(readinput*22.434);//Scale 0-1023 to 0..22950
    ///count=count+readinput;
    
    if(count>=100000)
      {
        count=10000;
      }
      delay(1000);
    }
}