//SSD ANODE;Ultrasonic
int seg[] = {15, 2, 4, 16, 17, 5, 18};
int data[10][7] = {
  {0, 0, 0, 0, 0, 0, 1},  // 0
  {1, 1, 1, 1, 0, 0, 1},  // 1
  {0, 0, 1, 0, 0, 1, 0},  // 2
  {0, 0, 0, 0, 1, 1, 0},  // 3
  {1, 0, 0, 1, 1, 0, 0},  // 4
  {0, 1, 0, 0, 1, 0, 0},  // 5
  {0, 1, 0, 0, 0, 0, 0},  // 6
  {0, 0, 0, 1, 1, 1, 1},  // 7
  {0, 0, 0, 0, 0, 0, 0},  // 8
  {0, 0, 0, 0, 1, 0, 0}   // 9
};
const int trig=13;
const int echo=14;
const int LED=22;
long duration;
int distance;
void setup() {
  pinMode(trig,OUTPUT);
  pinMode(echo,INPUT);
  pinMode(LED,OUTPUT);
   for (int i = 0; i < 7; i++) {
    pinMode(seg[i], OUTPUT);
  }
  Serial.begin(9600);

}

void loop(){
  digitalWrite(trig,LOW);
 delayMicroseconds(2);
 digitalWrite(trig,HIGH);
 delayMicroseconds(10);
 digitalWrite(trig,LOW);
    duration=pulseIn(echo,HIGH);
    distance=duration*0.034/2;
  if(distance<=9){
    Serial.print("Distance to Obstacle is ");
    Serial.print(distance);
    Serial.println(" cm.");
    for(int i=0;i<7;i++){
      digitalWrite(seg[i],data[distance][i]);
    }
    digitalWrite(LED, HIGH);
  }   
 else{
    for(int i=0;i<7;i++){
      digitalWrite(seg[i],HIGH);
    }
  Serial.println("No Obstacle detected.");
  digitalWrite(LED,LOW);
 }
}