const int trigpin =5;
const int echopin =18;
const int segmentos[4] = {25,26,27,12};

#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701
long duration;
float distanceCm;
float distanceInch;
void setup() 
{
Serial.begin(115200);
pinMode(trigpin, OUTPUT);
pinMode(echopin, INPUT);}
pinMode (ledpin1, OUTPUT)
pinMode (ledpin2, OUTPUT)
pinMode (ledpin3, OUTPUT)
pinMode (ledpin4, OUTPUT)
} 

void loop() 
{
digitalWrite(trigpin,LOW);
delayMicroseconds(2);
digitalWrite(trigpin, HIGH);
delayMicroseconds(10);
digitalWrite(trigpin, LOW);
duration = pulseIn(echopin, HIGH);
distanceCm = duration * SOUND_SPEED/2;
distanceInch = distanceCm * CM_TO_INCH;
Serial.print("Distance (cm):");
Serial.println(distanceCm);
Serial.print("Distance (inch):");
Serial.println(distanceInch);
delay(1000);
}
{
  if(distanceCm<3);
  
}