#include <LedControl.h>

const int DIN_PIN = 11;
const int CS_PIN = 6;
const int CLK_PIN = 13;

// Ultrasonic Sensor Pins
const int ECHO_PIN = 3;
const int TRIG_PIN = 4;

// Max distance to measure
const int MAX_DISTANCE = 120;

// Image definitions (emojis) for different ranges
const uint64_t IMAGES[] = {
  0x00427e7e18666600, // Image 1
  0x24187e3c18181800, // Image 2
  0x003c420000666600, // Image 3
  0xcce673399cce6733, // Image 4
  0x00002472994e2400, // Image 5
  0x1818001830647e3c, // Image 6
  0x3232323232323232, // Image 7
  0x38380038387c7c7c, // Image 8
  0x00c3ffdb3c7e7e18, // Image 9
  0x003c0066ffff0000, // Image 10
  0x2466ff3c1818183c, // Image 11
  0x0408183e0c183000, // Image 12
  0x0024187e5ae70000  // Image 13
};
const int IMAGES_LEN = sizeof(IMAGES) / 8;

LedControl display = LedControl(DIN_PIN, CLK_PIN, CS_PIN);

void setup() {
  // Initialize the LED display
  display.clearDisplay(0);
  display.shutdown(0, false);
  display.setIntensity(0, 10);

  // Initialize the ultrasonic sensor
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void displayImage(uint64_t image) {
  // Display the image with correct orientation
  for (int i = 0; i < 8; i++) {
    byte row = (image >> (i * 8)) & 0xFF;
    for (int j = 0; j < 8; j++) {
      display.setLed(0, i, 7 - j, bitRead(row, j)); // Mirroring adjustment
    }
  }
}

int getDistance() {
  // Send a pulse to the ultrasonic sensor
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Measure the time it takes for the echo to return
  long duration = pulseIn(ECHO_PIN, HIGH);
  // Convert duration to distance in cm
  int distance = duration * 0.034 / 2;

  // Ensure the distance is within bounds
  if (distance > MAX_DISTANCE) {
    distance = MAX_DISTANCE;
  }
  return distance;
}

void loop() {
  int distance = getDistance();
  
  // Choose the emoji based on distance ranges
  int imageIndex = map(distance, 0, MAX_DISTANCE, 0, IMAGES_LEN - 1);
  displayImage(IMAGES[imageIndex]);

  delay(200);
}