#include <Arduino_APDS9960.h>


int latchPin = 5;  // Latch pin of 74HC595 is connected to Digital pin 5
int clockPin = 6;  // Clock pin of 74HC595 is connected to Digital pin 6
int dataPin = 4;   // Data pin of 74HC595 is connected to Digital pin 4

byte leds = 0;  // Variable to hold the pattern of which LEDs are currently turned on or off

void setup() {
  // Set all the pins of 74HC595 as OUTPUT
  pinMode(latchPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);

  Serial.begin(9600);
  while (!Serial)
    ;

  if (!APDS.begin()) {
    Serial.println("Error initializing APDS-9960 sensor.");
  }

  Serial.println("READY!");
}

void loop() {

  if (APDS.gestureAvailable()) {
    // A gesture was detected, read and print to Serial Monitor.
    int gesture = APDS.readGesture();

    switch (gesture) {
      case GESTURE_UP:
        Serial.println("Detected UP gesture");
        break;

      case GESTURE_DOWN:
        Serial.println("Detected DOWN gesture");
        break;

      case GESTURE_LEFT:
        Serial.println("Detected LEFT gesture");
        for (int i = 7; i >= 0; i--)  // Turn all the LEDs ON one by one.
        {
          bitSet(leds, i);  // Set the bit that controls that LED in the variable 'leds'
          updateShiftRegister();
          delay(100);
        }

        delay(1000);
        break;

      case GESTURE_RIGHT:
        Serial.println("Detected RIGHT gesture");
        for (int i = 0; i < 8; i++)  // Turn all the LEDs ON one by one.
        {
          bitSet(leds, i);  // Set the bit that controls that LED in the variable 'leds'
          updateShiftRegister();
          delay(100);
        }

        delay(1000);
        break;

      default:
        // Ignore.
        break;
    }
  }  //  end if gesture available


  leds = 0;  // Initially turns all the LEDs off, by giving the variable 'leds' the value 0
  updateShiftRegister();
 // delay(1000);
}


void updateShiftRegister() {
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, LSBFIRST, leds);
  digitalWrite(latchPin, HIGH);
}