#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeSansBoldOblique18pt7b.h>
#include <Fonts/FreeSans18pt7b.h> 
#include <Keypad.h>

char num[5];
int digits = 0;

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

byte rowPins[ROWS]={5,4,3,2};  //connect to the row pinouts of the keypad
byte colPins[COLS]={9,8,7,6};  //connect to the column pinouts of the keypad

int i;

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

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

void setup() {
  
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println("SSD1306 allocation failed");
    for(;;); 
  }
  
 display.setFont(&FreeSansBoldOblique18pt7b);
    display.setTextColor(WHITE);        
    display.setTextSize(1);
    display.setCursor(8,45);
    display.println("Chibai");
    display.display();
   delay(3000);
    display.clearDisplay();  
    display.display();

   Serial.begin(9600); 
}

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


if ( (key) && digits<5)
   {
    display.clearDisplay();  
    display.display();
    
    display.setCursor(0,25);
    display.println("Length:");
    delay (1000);

    Serial.print("Key ");
    Serial.print(key);
    Serial.println(" is pressed");
     Serial.print("\n");
    num[digits] = key;
        
    if (digits==0)
    {i=100;}
    
    if (digits==1)
    {i=80;}

    if (digits==2)
    {i=60;}

    if (digits==3)
    {i=40;}

    if (digits==4)
    {i=20;}

    for(int j=0; j<=digits; j++)
    {
    display.setCursor(i,60);             
    display.println(num[j]);
    i=i+24;
    Serial.print(i);
       Serial.print("\n");
      Serial.print(num[j]);
       Serial.print("\n");
      display.display();
    
       
    }
    
    digits++;
   }
  
  if ((key =='*') || (key =='#'))
  {
    
       
    display.clearDisplay();  
    display.display();
     
   digits=0;
  //  radio.write(&key, sizeof(key));
  }

}