// Jorge Javier from different codes 2021 Fab Academy
# define led 13
int trigger = 12; 
int echo = 13; 
float tiempo_de_espera,distancia; // floating distance.
 

void setup() {
  Serial.begin (9600);   // serial communication
  pinMode (trigger, OUTPUT); // pin 12 as exit
  pinMode (echo, INPUT);   // pin 13 as entrance
  pinMode(2,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(5,OUTPUT);
  pinMode(6,OUTPUT);
  pinMode(7,OUTPUT);
  pinMode(8,OUTPUT);
  pinMode(9,OUTPUT);
        
}

void loop() {
digitalWrite (trigger,LOW); // set low pin 13 for 2 microseconds
delayMicroseconds(2);
digitalWrite (trigger, HIGH);// set high pin 13 for 10 microseconds;
delayMicroseconds (10);     // sonar for 13 seconds
digitalWrite (trigger, LOW); // set low again pin 11 

tiempo_de_espera = pulseIn (echo,HIGH); // pulseIn, recoge la señal del sonido que emite el trigger
/*La función pulseIn espera la aparición de un pulso en una entrada y mide su duración, dando como resultado la duración medida                   
 El primer parámetro (ECHO) es el pin sobre el que se realizará la medición.
Y el segundo parámetro (HIGH) indica si el pulso a esperar será un 1 (HIGH) o un 0 (LOW).
 */
distancia =(tiempo_de_espera/2)/29.15; // formula para hallar la distancia

Serial.print (distancia);    // print distance in cm
Serial.println ("cm");
delay (300);
if (distancia>=40 && distancia <=60){
  digitalWrite (2,1);
  digitalWrite (3,1);
  digitalWrite (4,1);
  digitalWrite (5,1);
  digitalWrite (6,1);
  digitalWrite (7,1);
  digitalWrite (8,1);
  digitalWrite (9,1);
}
if (distancia>=36 && distancia <=50){
  digitalWrite (2,1);
  digitalWrite (3,0);
  digitalWrite (4,0);
  digitalWrite (5,0);
  digitalWrite (6,0);
  digitalWrite (7,0);
  digitalWrite (8,0);
  digitalWrite (9,0);
}
if (distancia>=32 && distancia <=45){
  digitalWrite (2,1);
  digitalWrite (3,1);
  digitalWrite (4,0);
  digitalWrite (5,0);
  digitalWrite (6,0);
  digitalWrite (7,0);
  digitalWrite (8,0);
  digitalWrite (9,0);
}
if (distancia>=28 && distancia <=40){
  digitalWrite (2,0);
  digitalWrite (3,1);
  digitalWrite (4,1);
  digitalWrite (5,0);
  digitalWrite (6,0);
  digitalWrite (7,0);
  digitalWrite (8,0);
  digitalWrite (9,0);  
}
if (distancia>=24 && distancia <=35){
  digitalWrite (2,0);
  digitalWrite (3,0);
  digitalWrite (4,1);
  digitalWrite (5,1);
  digitalWrite (6,0);
  digitalWrite (7,0);
  digitalWrite (8,0);
  digitalWrite (9,0);
}
if (distancia>=20 && distancia <=30){
  digitalWrite (2,0);
  digitalWrite (3,0);
  digitalWrite (4,0); 
  digitalWrite (5,1);
  digitalWrite (6,1);
  digitalWrite (7,0);
  digitalWrite (8,0);
  digitalWrite (9,0);
}
if (distancia>=16 && distancia <=25){
  digitalWrite (2,0);
  digitalWrite (3,0);
  digitalWrite (4,0);
  digitalWrite (5,0);
  digitalWrite (6,1);
  digitalWrite (7,1);
  digitalWrite (8,0);
  digitalWrite (9,0);
}
if (distancia>=12 && distancia <=20){
  digitalWrite (2,0);
  digitalWrite (3,0);
  digitalWrite (4,0);
  digitalWrite (5,0);
  digitalWrite (6,0);
  digitalWrite (7,1);
  digitalWrite (8,1);
  digitalWrite (9,0);
}
if (distancia>=8 && distancia <=15){
  digitalWrite (2,0);
  digitalWrite (3,0);
  digitalWrite (4,0);
  digitalWrite (5,0);
  digitalWrite (6,0);
  digitalWrite (7,0);
  digitalWrite (8,1);
  digitalWrite (9,1);
}

}