#include <Servo.h>

int TRIGGER_PIN = 8;
int ECHO_PIN = 7;
Servo servo;

void setup() {
 servo.attach(22);
 Serial.begin(9600);
 pinMode(TRIGGER_PIN, OUTPUT);
 pinMode(ECHO_PIN, INPUT);
}

void loop() {
 digitalWrite(TRIGGER_PIN, HIGH);
 delayMicroseconds(10);
 digitalWrite(TRIGGER_PIN, LOW);

 int duration = pulseIn(ECHO_PIN, HIGH);
 int cm = duration * 0.034 / 2;

 int angle = map(cm, 0, 200, 0, 180); 

 servo.write(angle);

 delay(100); 
}