#define PIN_TRIG 26
#define PIN_ECHO 25
#define LOWLED   18
#define MIDLED   19
#define HIGHLED  21
#define MOTOR    27

unsigned int level=0;

void setup(){

  pinMode(LOWLED,OUTPUT);
  pinMode(MIDLED,OUTPUT);
  pinMode(HIGHLED,OUTPUT);
  pinMode(MOTOR,OUTPUT);
  digitalWrite(LOWLED,HIGH);
  digitalWrite(MIDLED,HIGH);
  digitalWrite(HIGHLED,HIGH);
  digitalWrite(MOTOR,LOW);

  Serial.begin(115200);
  pinMode(PIN_TRIG,OUTPUT);
  pinMode(PIN_ECHO,INPUT);
}

void loop(){
  //start a new mesurement:
  digitalWrite(PIN_TRIG,HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG,LOW);

  //Read the result:
  int duration=pulseIn(PIN_ECHO,HIGH);
  Serial.print("Distance in cm:");
  Serial.println(duration/58);
  Serial.print("Distance in inches:");
  Serial.println(duration/148);

level = duration/58;

if (level<=100)
{
digitalWrite(18, HIGH);
  

}
else if (level>=150);
{
  digitalWrite(18, LOW);
digitalWrite(19, HIGH);
  
}
else if (level>350);
{
  digitalWrite(19, LOW);
  
  digitalWrite(21,HIGH);
  

}
delay(1000);
}