#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Keypad.h>
const byte ROW = 4;
const byte COL = 4;
#define LED_PI 23

char keyscode[ROW][COL] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}};

byte rowPin[ROW] = { 19, 18, 5, 17 };
byte colPin[COL] = { 16, 4, 2, 15 };

Keypad customKeypad = Keypad( makeKeymap(keyscode), rowPin, colPin, ROW, COL);

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
void setup() {
  pinMode(LED_PI,OUTPUT);
  digitalWrite(LED_PI,LOW);

  Serial.begin(115200);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();
  display.setTextSize(3);
  display.setTextColor(WHITE);
}

void loop(){
  char customKey = customKeypad.getKey();
  if (customKey) {
    display.setCursor(0, 10);
    display.println(customKey);
    display.display(); 
    Serial.println(customKey);
   if (customKey == '1')
  {
    digitalWrite(LED_PI,HIGH);
    delay(10);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == '2')
  {
    digitalWrite(LED_PI,HIGH);
    delay(20);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == '3')
  {
    digitalWrite(LED_PI,HIGH);
    delay(30);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == '4')
  {
    digitalWrite(LED_PI,HIGH);
    delay(40);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == '5')
  {
    digitalWrite(LED_PI,HIGH);
    delay(50);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == '6')
  {
    digitalWrite(LED_PI,HIGH);
    delay(60);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == '7')
  {
    digitalWrite(LED_PI,HIGH);
    delay(70);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == '8')
  {
    digitalWrite(LED_PI,HIGH);
    delay(80);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == '9')
  {
    digitalWrite(LED_PI,HIGH);
    delay(90);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == '*')
  {
    digitalWrite(LED_PI,HIGH);
    delay(100);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == '0')
  {
    digitalWrite(LED_PI,HIGH);
    delay(110);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == '#')
  {
    digitalWrite(LED_PI,HIGH);
    delay(120);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == 'A')
  {
    digitalWrite(LED_PI,HIGH);
    delay(130);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == 'B')
  {
    digitalWrite(LED_PI,HIGH);
    delay(140);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == 'C')
  {
    digitalWrite(LED_PI,HIGH);
    delay(150);
    digitalWrite(LED_PI,LOW);
  }
  else if (customKey == 'D')
  {
    digitalWrite(LED_PI,HIGH);
    delay(160);
    digitalWrite(LED_PI,LOW);
  }
  else;
  }
  display.clearDisplay();
}