#include <LedControl.h>

int DIN = 12;
int CS = 11;
int CLK = 10;

int distancia = 0;
int aleatorio = 0;
int aleatorioant = 0;

//sensor de ultrasonido
long u_tiempo(int trigger_pin, int echo_pin) {
  digitalWrite(trigger_pin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigger_pin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigger_pin, LOW);
  long microseconds = pulseIn(echo_pin , HIGH);
  return microseconds;
}

long u_distancia(int trigger_pin, int echo_pin) {
  long microseconds = u_tiempo(trigger_pin, echo_pin);
  long u_distancia;
  u_distancia = microseconds / 29 / 2;
  if (u_distancia == 0) {
    u_distancia = 999;
  }
  return u_distancia;
}

//Expresiones
byte smile[8] =  {0x3C, 0x42, 0xA5, 0x81, 0xA5, 0x99, 0x42, 0x3C};
byte neutral[8] = {0x3C, 0x42, 0xA5, 0x81, 0xBD, 0x81, 0x42, 0x3C};
byte heart_shape_1[8] = {  B01100110,  B11111111,  B11111111,  B11111111,  B01111110,  B00111100,  B00011000,  B00000000};
byte cat[8] = {B10001000, B11111000, B10101000, B01110001, B00100001, B01111001, B01111101, B10111110  };
byte apple [8] = {B00011000, B00001000, B01110110, B11111111, B11111111, B11111111, B01111010, B00110100};

LedControl lc = LedControl(DIN, CLK, CS, 0);

void setup() {

  lc.shutdown(0, false);
  lc.setIntensity(0, 10);
  lc.clearDisplay(0);

  pinMode(3 , INPUT);
  pinMode(2 , OUTPUT);

  randomSeed(analogRead(0));

  printByte(neutral);

}
void loop() {

  aleatorio = 0;

  distancia = u_distancia(2, 3);

  if (distancia <= 10) {
    aleatorio = random(1, 5);
  }

  if (aleatorio != aleatorioant) {

    if (aleatorio == 0) {
      printByte(neutral);
    }

    if (aleatorio == 1) {
      printByte(smile);
    }

    if (aleatorio == 2) {
      printByte(heart_shape_1);
    }


    if (aleatorio == 3) {
      printByte(cat);
    }

    if (aleatorio == 4) {
      printByte(apple);
    }

  }

  aleatorioant = aleatorio;

  delay(100);

}

void printByte(byte character []) {

  int i = 0;

  for (i = 0; i < 8; i++) {

    lc.setRow(0, i, character[i]);

  }

  delay(2000);

}