Activating a continuous servo with a HC SR04 sensor

Hi, I´m trying to activate a continuous servo with a HC SR04 ultrasonic sensor, I did this before but with a regular 180º servo using a code that worked perfectly, I would like to know what are the changes that i have to do in order to activate the sevo and make it turns at a slow speed and then when there is no signal from the sensor it should stop.
for the regular 180º servo i used a code from

What changes i should do to make it work with continuous rotation servo Thanks

// Turning NeoPixels on and off using a HC-SRO4 Ping Sensor
/*
   This sketch reads a HC-SR04 ultrasonic rangefinder and returns the
   distance to the closest object in range. To do this, it sends a pulse
   to the sensor to initiate a reading, then listens for a pulse 
   to return.  The length of the returning pulse is proportional to 
   the distance of the object from the sensor.
   The Arduino then takes this information and initiates a series of
   sweeps. A sweep is defined as the servo moving its horn from the
   0 position to 180 and back to 0 then to -180 and back to 0.  
   This code was developed partially from Ping))) code found in the public domain
   written by David A. Mellis, and adapted to the HC-SRO4 by Tautvidas Sipavicius, 
   while other portions were written by Charles Gantt and Curtis Gauger from
   http://www.themakersworkbench.com. 
   
   This code was written for a tutorial on http://www.themakersworkbench.com, 
   and was designed for use in a project built by The Young Makers of Greater Augusta. 
   */

//Tell the Arduino Ide to include the Servo.h library.
#include <Servo.h> 
 
 //Setup the variables for the HC-SR04
 const int trigPin = 6;
 const int echoPin = 7;

 // create servo object to control a servo
 // a maximum of eight servo objects can be created
Servo myservo; 
                 
// variable to store the servo position 
int pos = 0;    

void setup() {
  // initialize serial communication:
  Serial.begin(9600);
  
// attaches the servo on pin 9 to the servo object
  myservo.attach(9);  
  
}

void loop()
{
  // establish variables for duration of the ping, 
  // and the distance result in inches and centimeters:
  long duration, inches, cm;
  
  // The sensor is triggered by a HIGH pulse of 10 or more microseconds.
  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
  pinMode(trigPin, OUTPUT);
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Read the signal from the sensor: a HIGH pulse whose
  // duration is the time (in microseconds) from the sending
  // of the ping to the reception of its echo off of an object.
  pinMode(echoPin, INPUT);
  duration = pulseIn(echoPin, HIGH);
  
  // convert the time into a distance
  inches = microsecondsToInches(duration);
  cm = microsecondsToCentimeters(duration);
  
  //Tell the Arduino to print the measurement in the serial console
  Serial.print(inches);
  Serial.print("in, ");
  Serial.print(cm);
  Serial.print("cm");
  Serial.println();
  
  // This if-else statement tells the Arduino at what distance 
  // it should trigger the servo, what the servo should do,
  // and what it should do if the distance is too far away.
   if (inches <= 24)  {sweep(3);
   
   }
   else if (inches >= 24) {myservo.write(pos);
   }
   
   // Tell the Arduino to wait 0.10 seconds before pinging the 
   // Ultrasonic Sensor again.
   delay(100);
}
// Converts the microseconds reading to Inches
long microsecondsToInches(long microseconds)
{
  // According to Parallax's datasheet for the PING))), there are
  // 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
  // second).  This gives the distance travelled by the ping, outbound
  // and return, so we divide by 2 to get the distance of the obstacle.
  // See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
  return microseconds / 74 / 2;
}
//Converts the Microseconds Reading to Centimeters
long microsecondsToCentimeters(long microseconds)
{
  // The speed of sound is 340 m/s or 29 microseconds per centimeter.
  // The ping travels out and back, so to find the distance of the
  // object we take half of the distance travelled.
  return microseconds / 29 / 2;
}

//This sub-routein is what dictates the movement of the servo
void sweep(int NUM_OF_CYCLES) 
  
{ 
// Tells the Arduino to start this loop at 0 and incriment it by 1
// each time the loop completes. This is how the Arduino knows to 
// stop the loop when a specific number of the Sweep routein has been ran.
  for (int j=0; j<NUM_OF_CYCLES; j++)
  for(pos = 0; pos < 180; pos += 1)  // goes from 0 degrees to 180 degrees 
  {                                  // in steps of 1 degree 
    myservo.write(pos);              // tell servo to go to position in variable 'pos' 
    delay(10);                       // waits 15ms for the servo to reach the position 
  } 
  for(pos = 180; pos>=1; pos-=1)     // goes from 180 degrees to 0 degrees 
  {                                
    myservo.write(pos);              // tell servo to go to position in variable 'pos' 
    delay(10);                       // waits 15ms for the servo to reach the position 
  } 
}

First, you need to find the "angle" at which the servo stops.
Trial-and-error (mostly the latter) works for me.

Hi thanks for answer, with continuous rotation i understand that the values in degrees correspond to speed and direction, in that case 90 should be the value for it to stop, and 100 to rotate slowly, my issue is how to put dose values in order to make it work, because i see that there are another values that need to be change.

90 may or may not be the correct “stop” point, and the speed control may be not at all linear - you may be stopped at 90, and going full speed at 100 or 80.
It’s much better, for fine control, to use the “writeMicroseconds” method.