#include <SPI.h>

#include <Wire.h>

#include <LiquidCrystal_I2C_8574.h>

#include <SeeedOLED.h>

#include <avr/pgmspace.h>

LiquidCrystal_I2C_8574 lcd(0x20, 20, 4); // set the LCD address to 0x20 for a 16 chars and 2 line display

//const byte SS = 10;  // omit this line for Arduino 1.0 onwards

const byte MAX7219_REG_NOOP        = 0x0;

// codes 1 to 8 are digit positions 1 to 8

const byte MAX7219_REG_DECODEMODE  = 0x9;

const byte MAX7219_REG_INTENSITY   = 0xA;

const byte MAX7219_REG_SCANLIMIT   = 0xB;

const byte MAX7219_REG_SHUTDOWN    = 0xC;

const byte MAX7219_REG_DISPLAYTEST = 0xF;

const int AnalogPin = 9;

void sendByte (const byte reg, const byte data)

{

digitalWrite (SS, LOW);

SPI.transfer (reg);

SPI.transfer (data);

digitalWrite (SS, HIGH);

}  // end of sendByte

void setup ()

{

SPI.begin ();

sendByte (MAX7219_REG_SCANLIMIT, 7);      // show 4 digits

sendByte (MAX7219_REG_DECODEMODE, 0xFF);  // use digits (not bit patterns)

sendByte (MAX7219_REG_DISPLAYTEST, 0);    // no display test

sendByte (MAX7219_REG_INTENSITY, 3);      // character intensity: range: 0 to 15

sendByte (MAX7219_REG_SHUTDOWN, 1);       // not in shutdown mode (ie. start it up)

// init 16x2 LCD display on I2C 0x20

lcd.init();                      // initialize the lcd

// Print a message to the LCD.

lcd.backlight();

lcd.setCursor(0, 0);

lcd.print("Hello from!");

lcd.setCursor(0, 1);

lcd.print("The Breadboard");

delay(2000);

lcd.clear();

lcd.setCursor(0, 0);

lcd.print("Counter:-");

// init OLED 128x64 display

SeeedOled.init();                   //initialze SEEED OLED display

SeeedOled.clearDisplay();          //clear the screen and set start position to top left corner

SeeedOled.setNormalDisplay();      //Set display to normal mode (i.e non-inverse mode)

SeeedOled.setPageMode();           //Set addressing mode to Page Mode

SeeedOled.setTextXY(0,0);          //Set the cursor to Xth Page, Yth Column

SeeedOled.putString("Hello viewers"); //Print the String

SeeedOled.setTextXY(3,0);          //Set the cursor to Xth Page, Yth Column

SeeedOled.putString("youtube");

SeeedOled.setTextXY(4,0);          //Set the cursor to Xth Page, Yth Column

SeeedOled.putString("thebreadboardca"); //Print the String

pinMode(AnalogPin, OUTPUT);

}   // end of setup

void number (const int num)

{

char buf [8];

sprintf (buf, "%8i", min (max (num, 0), 99999999));

lcd.setCursor(0, 1);

lcd.print(buf);

SeeedOled.setTextXY(6,0);          //Set the cursor to Xth Page, Yth Column

SeeedOled.putString(buf); //Print the String

analogWrite(AnalogPin, num & 0XFF);

// send all 8 digits

for (byte digit = 8; digit > 0; digit--)

{

byte c = buf [8 - digit];

if (c == ' ' )

c = 0xF;  // code for a blank

else

c -= '0';

sendByte (digit , c);

}

}  // end of number

unsigned int i=99990000;

void loop ()

{

number (i++);

if (i > 99999999) i = 0;

delay (1);

}  // end of loop