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

char num[3];
int digits = 0;
/*#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>


RF24 radio(9, 10); // CE, CSN

const byte address[6] = "00001"; */



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


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

int i;

#define SSD1306_NO_SPLASH
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#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()
{
   
   /*
  radio.begin();
  radio.openWritingPipe(address);
  radio.setPALevel(RF24_PA_MIN);
  radio.stopListening();
*/

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




    display.setFont(&FreeSans18pt7b);
            
    display.setTextColor(WHITE);        
    display.setTextSize(2);
   
   
   display.clearDisplay();  
   display.display();
   Serial.begin(9600);
}
  
void loop()
{
  
  
  
  
  
  char key = keypad.getKey();
  // just print the pressed key
   if ( (key) && digits<3)
   {
    


    display.clearDisplay();  
    display.display();
    
    Serial.print("Key ");
    Serial.print(key);
    Serial.println(" is pressed");
     Serial.print("\n");
    num[digits] = key;
        
    if (digits==0)
    {i=90;}
    
    if (digits==1)
    {i=45;}

    if (digits==2)
    {i=0;}

    for(int j=0; j<=digits; j++)
    {
    display.setCursor(i,55);             
    display.println(num[j]);
    i=i+45;
    Serial.print(i);
       Serial.print("\n");
      Serial.print(num[j]);
       Serial.print("\n");
      display.display();
    
       
    }
    
    digits++;
      
  
 
  //  radio.write(&key, sizeof(key));
 
 
  } 
  
  
  if ((key =='*') || (key =='#'))
  {
    
       
    display.clearDisplay();  
    display.display();
     
   digits=0;
  //  radio.write(&key, sizeof(key));
  }
}