#include <Arduino.h>
#include <LedControl.h>
//#include "pitch.h"

const int LED_DIN = 11;
const int LED_CLK = 13;
const int LED_CS = 10;

const int TRIG = 9;
const int ECHO = 8;

LedControl lc = LedControl(LED_DIN, LED_CLK, LED_CS, 1);

int duration = 0;
int distance = 0;
//const int STEP = 30;
//const int THRESHOLD = 30;

byte levels[8][8] = {
  {B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000},
  {B00000000, B00000000, B00000000, B00011000, B00011000, B00000000, B00000000, B00000000},
  {B00000000, B00000000, B00011000, B00111100, B00111100, B00011000, B00000000, B00000000},
  {B00000000, B00011000, B00111100, B01111110, B01111110, B00111100, B00011000, B00000000},
  {B00011000, B00111100, B01111110, B11111111, B11111111, B01111110, B00111100, B00011000},
  {B00111100, B01111110, B11111111, B11111111, B11111111, B11111111, B01111110, B00111100},
  {B01111110, B11111111, B11111111, B11111111, B11111111, B11111111, B11111111, B01111110},
  {B11111111, B11111111, B11111111, B11111111, B11111111, B11111111, B11111111, B11111111}
};

void setup() {
  Serial.begin(9600);

  lc.shutdown(0, false);
  lc.setIntensity(0, 8);
  lc.clearDisplay(0);

  pinMode(TRIG, OUTPUT);
  pinMode(ECHO, INPUT);

  // power on animation
  for (int i=0; i<8; i++) {
    for (int j=0; j<8; j++) {
      lc.setRow(0, j, levels[i][j]);
    }
    delay(100);
  }
}

void display(int scale) {
  // 距離に応じたレベル表示
  int level = min(scale , 7);
  for (int i=0; i<8; i++) {
    lc.setRow(0, i, levels[level][i]);
  }
}

void loop() {
  digitalWrite(TRIG, LOW);
	delayMicroseconds(2);// Sets the trigPin HIGH (ACTIVE) for 10 microseconds
	digitalWrite(TRIG, HIGH);
	delayMicroseconds(10); //Creates a ten microsecond delay
	digitalWrite(TRIG, LOW); // Reads the echoPin, returns the sound wave travel time in microseconds

	duration = pulseIn(ECHO, HIGH);// Calculating the distance
	distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
  Serial.println(distance);
  Serial.print(" cm");
  //if (distance > 200)
  int scale = map(distance, 0 , 400, 0, 8);
  display(scale);
  delay(50);
}