#include <Keypad.h>
#include <Adafruit_NeoPixel.h>

#define LED_PIN    10
#define LED_COUNT 16

Adafruit_NeoPixel ring(LED_COUNT, LED_PIN, NEO_RGBW + NEO_KHZ800);

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 4,3,2,1 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 8,7,6,5 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

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

  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);

  ring.begin();           
  ring.show();            
  ring.setBrightness(50); 
}

void loop() {
  char key = keypad.getKey();

  if (key != NO_KEY) {
    Serial.println(key);
  }

  if(key == '1') {
    for(int a=0; a<=3; a++){
      digitalWrite(12, HIGH);
      delay(100);
      digitalWrite(12, LOW);
      delay(100);

    } 
  }

  if(key == '2'){
    tone(11, 1200);
    delay(200);
    tone(11, 0);
    delay(200);
  }

  if(key == '3'){

    for(int i = 0; i < ring.numPixels(); i++){
    ring.setPixelColor(i, random(255), random(255), random(255), 0);
    ring.show();
    delay(50);
  }
  for(int i = ring.numPixels()-1; i >= 0; i--){
    ring.setPixelColor(i, 0, 0, 0, 0);
    ring.show();
    delay(50);
  }

  }

}