NHD-0420DZW-AB5

nathanbabu

• December 27, 2016 05:11

Hi Sir,
         I want to use the OLED using I2C Concept Please provide sample code and Connection diagram for hardware connection between arduino and our OLED Display.

Thanks & Regards,
Padmanathan.P

0

• 

  Saurabh_B

  • December 27, 2016 11:25

  Hello Padmanthan,
  
  This display does not support an I2C interface, you would need to use SPI or Parallel.
  If you are looking to use I2C i would recommend our Slim OLED displays.

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• 

  nathanbabu

  • December 29, 2016 06:01

  Thanks for your reply..
  
  Kindly provide sample code for SPI Interface. And i am modified Jumper settings as per the Specification sheet in your website.
  
  And  I am using arduino for this interface programming.
  
  Regards,
  Padmanathan.P

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• 

  Saurabh_B

  • December 29, 2016 08:02

  Here is an example SPI code for the serial OLED displays:

  sbit SCL = P3^4;   //Serial Clock Pin
  sbit SDOUT = P1^0;   // Serial Data Out
  sbit SDIN = P1^1;   // Serial Data In
  sbit C_S = P3^3;   // Chip Select
  
  /*************************************************
  ******** CHARACTER STRINGS ***********************  You can also use these to send a line of text you would like to display
  ************************************************** 
  *************************************************/
  char const text1[] = ("Testing OLED Display")
  char const text2[] = ("NewHaven Display L 2")
  char const text3[] = ("    Line  3 Test    ")
  char const text4[] = ("       Line 4       ")
  
  void delay(unsigned int n)    //Delay subroutine n* 250 cycles
  {
  unsigned int i,j;
  for (i=0;i<n;i++)
      for (j=0;j<250;j++)
       {;}
  }
   
  
  void WriteCommand(unsigned char ins)
  {
  unsigned char i;
  C_S=0;
  SCL = 0;
  SDOUT = 0;  //RS = 0 (Command)
  SCL = 1; //RS registered
  SCL = 0; 
  SDOUT = 0;  //RW = 0
  SCL = 1; //RW registered
  SCL = 0;
  
  for (i=0x80;i;i>>=1)
  {
  if((ins&0x80)==0x80)
  SDOUT = 1;
  else
  SDOUT = 0;
  ins=(ins<<1);
  SCL = 0;
  SCL = 1;
  SCL = 0;
  }
  
      C_S=1; 
  }
  
  void WriteDataInit()  // first write data command while setting Register Select
  {
  
  C_S=0;
  SCL = 0;
  SDOUT = 1; //RS = 1 (Data)
  SCL = 0; //RS registered
  SCL = 1;
  SCL = 0;
  SDOUT = 0;  //RW = 0
  SCL = 1; //RS registered
  SCL = 0;
  
  }
  void WriteData(unsigned char dat)  //continuous data stream
  {
  unsigned char i;
  for (i=0x80;i;i>>=1)
  {
  if((dat&0x80)==0x80)
  SDOUT = 1;
  else
  SDOUT = 0;
  dat=(dat<<1);
  SCL = 0;
  SCL = 1;
  SCL = 0;
  }
  
  }
  
  void Show_String(){
  WriteCommand(0x01);   // Clear Display
  WriteCommand(0x02);   // Return Home
  WriteDataInit();
  for( int i = 0; i< 20; i++){
  WriteData(text1[i]);
    }
    WriteCommand(0xC0); // Second Line
    WriteDataInit();
    for(int i = 0; i < 20; i++){
  WriteData(text2[i]);
    }
    WriteCommand(0x94); // Third Line
    WriteDataInit();
    for (int i = 0; i<20; i++){
  WriteData(text3[i]);
    }
  
    WriteCommand(0xD4); // Fourth Line
    WriteDataInit();
    for(int i = 0; i < 20; i++){
  WriteData(text4[i]);
      }
  }
  
  void init()
  {
  WriteCommand(0x38);//function set
  delay(30);
  WriteCommand(0x06);//entry mode set
  delay(30);
  WriteCommand(0x02);//return home
  delay(30);
  WriteCommand(0x01);//clear display
  delay(30);
  WriteCommand(0x0c);//display on
  delay(30);
  WriteCommand(0x80);//line 1 character 1
  delay(30);
  }
  
  
  void main()
  {
  char i=0x21, j;
  
  
  
  init();
  
  //Show_String();
  //delay(1000):
  while(1)
  { 
  C_S = 1;
  WriteCommand(0x80);  //Line 1 
  
  WriteDataInit();
  //WriteDataInit() must only be executed once before starting to write data
  //if WriteDataInit() is executed between writes, the display will recognize the two bits as data bits and not RS/RW bits. 
  for(j=0; j<20; j++)
  {
  WriteData(i++);
  delay(10);
  }
  
  C_S = 1;   
  //Pulling C_S High means write data is completed
  //if next instruction to the display is data, must use WriteDataInit() first
  //if write command is executed without pulling C_S high, it will recognize the following instruction on the bus as data regardless
  WriteCommand(0xC0);  //Line 2
  
  WriteDataInit();
  for(j=0; j<20; j++)
  {
  WriteData(i++);
  delay(10);
  }
  
  C_S = 1;
  WriteCommand(0x94);  //Line 3
  
  WriteDataInit();
  for(j=0; j<20; j++)
  {
  WriteData(i++);
  delay(10);
  }
  
  
  C_S = 1;
  WriteCommand(0xD4);  //Line 4
  
  WriteDataInit();
  for(j=0; j<20; j++)
  {
  WriteData(i++);
  delay(10);
  }
  
  }
  }

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• 

  nathanbabu

  • December 29, 2016 21:08

  Hi Sir,

  Thanks for your reply.
  
  Did you have any reference code for arduino?
  
  Regards,
  Padmanathan.P

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• 

  Engineering Support

  Community moderator

  • December 14, 2022 20:32

  Update: 

  Take a look at our Arduino code example for NHD-0420DZW displays for serial communication: 

  https://support.newhavendisplay.com/hc/en-us/articles/4413877064855-NHD-0420DZW-Serial-with-Arduino 

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