#include <LedControl.h>
int echoPin = 2;
int trigPin = 3;
int duration;
int distance;
int DIN = 13;
int CS1 =  11;
int CS2 = 10;
int CLK = 12;
LedControl lc1 = LedControl(DIN, CLK, CS1, 1);
LedControl lc2 = LedControl(DIN, CLK, CS2, 2);

void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT
	pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT
  lc1.shutdown(0, false);
  lc2.shutdown(0, false);
  lc1.setIntensity(0, 50);
  lc2.setIntensity(0, 50);
  lc1.clearDisplay(0);
  lc2.clearDisplay(0);
}

void printByte1(byte character []) {
  int i = 0;
  for (i = 0; i < 8; i++) {
    lc1.setRow(0, i, character[i]);
  }
}
void printByte2(byte character [], int panel) {
  int i = 0;
  for (i = 0; i < 8; i++) {
    lc2.setRow(panel, i, character[i]);
  }
}

void loop() {
  int panel; // which panel to use
  byte cero1[8] = {0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
  byte cero2[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
  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)
  //if (distance > 200)
  {
	int scale = map(distance, 0 , 400, 0, 8);  // Mapping 0 to 400CM with 0 to 8 rows
	for (int i=0;i<8;i++){
    if (distance >= 200){
		if (i<= scale){
			cero1[i] = 0xff;
      
		}
		else{
			cero1[i] = 0x00;
      
		}
	}
  }
  }
  int value = analogRead(A0); // to read potentiometer value
  int scale = map(value, 0, 1023, 0, 17);
  if (value > 512) { // if raw potentiometer is above middle, use panel 0, subtract 8 for row 
    panel = 0;
    scale = scale - 8;
  } else { // if raw potentiometer is below middle, use panel 1, subtract row from 8
    panel = 1;
    scale = 8 - scale;
  }
  for (int j = 0; j < scale; j++) {
    cero2[j] = 0xff;
  }
  printByte2(cero2, panel);
  delay(100);
  printByte1(cero1);
  delay(100);
}