Touchless Hand Sanitizer Dispenser

//www.elegoo.com
//2016.12.08
#include "SR04.h"
#include <Servo.h>


#define TRIG_PIN 12
#define ECHO_PIN 11
SR04 sr04 = SR04(ECHO_PIN,TRIG_PIN);
long a=0;


Servo myservo1;
Servo myservo2;
Servo myservo3;
Servo myservo4;




void setup() {
  Serial.begin(9600);
  myservo1.attach(2);
  myservo2.attach(3);
  myservo3.attach(4);
  myservo4.attach(5);
  delay(2000);
}


void loop() {
  a=sr04.Distance();
  Serial.print(a);
  Serial.println("cm");
//  delay(300);
if(a<=8&&a>=1)
{
  myservo1.write(120);
  myservo2.write(120);
  myservo3.write(120);
  myservo4.write(120);
  delay(1000);   //
 
 
}
else
{
  myservo1.write(0);
  myservo2.write(0);
  myservo3.write(0);
  myservo4.write(0);
}
 
}