Free "COVID" Touch

#define r1 2
#define r2 3
#define r3 4
#define r4 5
#define ea 6 
#define eb 1
#define trig1 7     
#define echo1 8
#define trig2 9
#define echo2 10
#define trig3 11
#define echo3 12
int x1;
int x2;
int x3;
int u1;
int u2;
int u3;
void setup() 
{
 pinMode (trig1 , OUTPUT);
 pinMode (echo1 , INPUT);
 pinMode (trig2 , OUTPUT);
 pinMode (echo2 , INPUT);
 pinMode (trig3 , OUTPUT);
 pinMode (echo3 , INPUT);
 pinMode (r1 , OUTPUT);
 pinMode (r2 , OUTPUT);
 pinMode (r3 , OUTPUT);
 pinMode (r4 , OUTPUT);
 pinMode (ea , OUTPUT);
 pinMode (eb , OUTPUT);
 Serial. begin (9600);
}

void loop() 
{

digitalWrite ( trig1 , LOW);
delayMicroseconds (5);
digitalWrite ( trig1 , HIGH);
delayMicroseconds (10);
digitalWrite ( trig1 , LOW);
x1=pulseIn (echo1 , HIGH);
u1 = x1/57;
Serial.println (u1);
digitalWrite ( trig2 , LOW);
delayMicroseconds (5);
digitalWrite ( trig2 , HIGH);
delayMicroseconds (10);
digitalWrite ( trig2 , LOW);
x2=pulseIn (echo2 , HIGH);
u2 = x2/57;
Serial.println (u2);
digitalWrite ( trig3 , LOW);
delayMicroseconds (5);
digitalWrite ( trig3 , HIGH);
delayMicroseconds (10);
digitalWrite ( trig3 , LOW);
x3=pulseIn (echo3 , HIGH);
u3 = x3/57;
Serial.println (u3);
analogWrite (eb,155);
analogWrite (ea,155);  
if (u1 < 10 )
{
  digitalWrite(r1,HIGH);     
digitalWrite(r2,LOW);
digitalWrite(r3,HIGH);  
digitalWrite(r4,LOW);
delay (1000);
}
if (u2 < 10)
{
    digitalWrite(r1,LOW);     
digitalWrite(r2,HIGH);
digitalWrite(r3,HIGH);  
digitalWrite(r4,LOW);
delay (1000);
}
if (u3 < 10)
{
  digitalWrite(r1,HIGH);     
digitalWrite(r2,LOW);
digitalWrite(r3,LOW);  
digitalWrite(r4,HIGH);
delay (1000);
} else 
{
  digitalWrite(r1,LOW);     
digitalWrite(r2,LOW);
digitalWrite(r3,LOW);  
digitalWrite(r4,LOW);
}
Serial . println ( u1);
Serial . println ( u2);
Serial . println ( u3);
}