#define trigPin 3
#define echoPin 2
#define led1 4
#define led2 5
#define led3 6
#define led4 7
#define led5 8
#define led6 9
#define led7 10
#define led8 11
#define led9 12
#define led10 13

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(led6, OUTPUT);
  pinMode(led7, OUTPUT);
  pinMode(led8, OUTPUT);
  pinMode(led9, OUTPUT);
  pinMode(led10, OUTPUT);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  long duration = pulseIn(echoPin, HIGH);
  int distance = duration / 58;
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" inches");
  if (distance == 10) {
    blinkLed();
  } else if (distance == 8) {
    collideLed();
  } else if (distance == 6) {
    leftToRightLed();
  } else if (distance == 4) {
    rightToLeftLed();
  } else if (distance == 2) {
  fadingLed();
  } else {
    clearLeds();
  }
}

void blinkLed() {
  digitalWrite(led1, HIGH);
  digitalWrite(led2, HIGH);
  digitalWrite(led3, HIGH);
  digitalWrite(led4, HIGH);
  digitalWrite(led5, HIGH);
  digitalWrite(led6, HIGH);
  digitalWrite(led7, HIGH);
  digitalWrite(led8, HIGH);
  digitalWrite(led9, HIGH);
  digitalWrite(led10, HIGH);
  delay(500);
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
  digitalWrite(led4, LOW);
  digitalWrite(led5, LOW);
  digitalWrite(led6, LOW);
  digitalWrite(led7, LOW);
  digitalWrite(led8, LOW);
  digitalWrite(led9, LOW);
  digitalWrite(led10, LOW);
  delay(500);
}

void collideLed() {
  digitalWrite(led1, HIGH);
  digitalWrite(led10, HIGH);
  delay(1000);
  digitalWrite(led1, LOW);
  digitalWrite(led10, LOW);
  delay(1000);
}

void leftToRightLed() {
  digitalWrite(led1,HIGH);
    delay(100);
    digitalWrite(led2,HIGH);
    delay(100);
    digitalWrite(led3,HIGH);
    delay(100);
    digitalWrite(led4,HIGH);
    delay(100);
    digitalWrite(led5,HIGH);
    delay(100);
    digitalWrite(led6,HIGH);
    delay(100);
    digitalWrite(led7,HIGH);
    delay(100);
    digitalWrite(led8,HIGH);
    delay(100);
    digitalWrite(led9,HIGH);
    delay(100);
    digitalWrite(led10,HIGH);
  }
void rightToLeftLed() {
   digitalWrite(led10,HIGH);
    delay(100);
    digitalWrite(led9,HIGH);
    delay(100);
    digitalWrite(led8,HIGH);
    delay(100);
    digitalWrite(led7,HIGH);
    delay(100);
    digitalWrite(led6,HIGH);
    delay(100);
    digitalWrite(led5,HIGH);
    delay(100);
    digitalWrite(led4,HIGH);
    delay(100);
    digitalWrite(led3,HIGH);
    delay(100);
    digitalWrite(led2,HIGH);
    delay(100);
    digitalWrite(led1,HIGH);
  }
void fadingLed() {
  for(int a = 0; a<3 ; a++){
  for(int fadeValue = 0; fadeValue <= 255; fadeValue += 5){

digitalWrite(A0, fadeValue);
digitalWrite(A1, fadeValue);
analogWrite(11, fadeValue);
analogWrite(10, fadeValue);
analogWrite(9, fadeValue);
digitalWrite(A2, fadeValue);
digitalWrite(A3, fadeValue);
analogWrite(6, fadeValue);
analogWrite(5, fadeValue);
analogWrite(3, fadeValue);
  delay(30);
  }
  }
  for(int fadeValue = 255; fadeValue >= 0; fadeValue -= 5){

digitalWrite(A0, fadeValue);
digitalWrite(A1, fadeValue);
analogWrite(11, fadeValue);
analogWrite(10, fadeValue);
analogWrite(9, fadeValue);
digitalWrite(A2, fadeValue);
digitalWrite(A3, fadeValue);
analogWrite(6, fadeValue);
analogWrite(5, fadeValue);
analogWrite(3, fadeValue);
  delay(30);
}
  }
 void clearLeds() {
    digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
  digitalWrite(led4, LOW);
  digitalWrite(led5, LOW);
  digitalWrite(led6, LOW);
  digitalWrite(led7, LOW);
  digitalWrite(led8, LOW);
  digitalWrite(led9, LOW);
  digitalWrite(led10, LOW);
  delay(500);
}