#include "LedControl.h"
#include "binary.h"

/* DIN connects to pin 12 CLK connects to pin 11 CS connects to pin 10 */

LedControl lc=LedControl(12,11,10,1);

#define echoPin 2 // attach pin D2 Arduino to pin Echo of HC-SR04

#define trigPin 3 //attach pin D3 Arduino to pin Trig of HC-SR04 // defines variables

int duration; // variable for the duration of sound wave travel

int distance;//variable for the distance measurement

int dm; // variable for what row to light up on the matrix

// Binary for the bar

byte dot[8]= {B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B11111111};

void setup() {

lc.shutdown(0,false); //sets up 8x8 matrix

lc.setIntensity(0,100000); // Set brightness to a medium value

lc.clearDisplay(0); // Clear the display

pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT

pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT

}

void loop(){

digitalWrite(trigPin, LOW);

delayMicroseconds(2);// Sets the trigPin HIGH (ACTIVE) for 10 microseconds

digitalWrite(trigPin, HIGH);

delayMicroseconds(10); //Creates a ten microsecond delay

digitalWrite(trigPin, LOW); // Reads the echoPin, returns the sound wave travel time in microseconds

duration = pulseIn(echoPin, HIGH);// Calculating the distance

distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)

//The following if statements convert the distance from the ultrasonic sensor into a variable for the matrix called "dm"

if(distance<=3 and distance>=0){

dm=7;

}

//This section of code lights up the LEDs on the matrix

lc.setRow(0,dm,dot[7]);

delay(10);

lc.clearDisplay(0);

if(distance<=5 and distance>=4){

dm=6;

}

lc.setRow(0,dm,dot[7]);

delay(10);

lc.clearDisplay(0);

if(distance<=7 and distance>=6){

dm=5;

}

lc.setRow(0,dm,dot[7]);

delay(10);

lc.clearDisplay(0);

if(distance<=9 and distance>=8){

dm=4;

}

lc.setRow(0,dm,dot[7]);

delay(10);

lc.clearDisplay(0);

if(distance<=11 and distance>=10){

dm=3;

}

lc.setRow(0,dm,dot[7]);

delay(10);

lc.clearDisplay(0);

if(distance<=13 and distance>=12){

dm=2;

}

lc.setRow(0,dm,dot[7]);

delay(10);

lc.clearDisplay(0);

if(distance<=15 and distance>=14){

dm=1;

}

lc.setRow(0,dm,dot[7]);

delay(10);

lc.clearDisplay(0);

if(distance<=19 and distance>=16){

dm=0;

}

lc.setRow(0,dm,dot[7]);

delay(10);

lc.clearDisplay(0);

}