12864min LCD

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12864g

12864MIN can display 128 * 64 dot matrix monochrome images, or 16 * 16 dot matrix display Chinese characters 8 * 4-line, or 8 * 16 dot matrix display in English, numbers, symbols 16 * 4 lines. Or 5 * 8 dot matrix display in English, numbers, symbols 21 * 8 lines.

  • Control IC UC 1701x

Specification of LCD

  • Rom is the Chinese words internal library, which is not used in this LCD, leave it NC

Speicification 12864MIN.jpg

IC Documents

Arduino demo code

 
#include "U8glib.h"
 
U8GLIB_NHD_C12864 u8g(13, 11, 10, 9, 8);    // SPI Com: SCK = 13, MOSI = 11, CS = 10, CD = 9, RST = 8 
 
void draw(void) {
  // graphic commands to redraw the complete screen should be placed here  
  u8g.setFont(u8g_font_unifont);
  //u8g.setFont(u8g_font_osb21);
  u8g.drawStr( 0, 20, "Electrodragon");
}
 
void setup(void) {
  u8g.setContrast(0); // Config the contrast to the best effect
  u8g.setRot180();// rotate screen, if required
  // set SPI backup if required
  //u8g.setHardwareBackup(u8g_backup_avr_spi);
 
  // assign default color value
  if ( u8g.getMode() == U8G_MODE_R3G3B2 ) {
    u8g.setColorIndex(255);     // white
  }
  else if ( u8g.getMode() == U8G_MODE_GRAY2BIT ) {
    u8g.setColorIndex(3);         // max intensity
  }
  else if ( u8g.getMode() == U8G_MODE_BW ) {
    u8g.setColorIndex(1);         // pixel on
  }
  else if ( u8g.getMode() == U8G_MODE_HICOLOR ) {
    u8g.setHiColorByRGB(255,255,255);
  }
}
 
void loop(void) {
  // picture loop
  u8g.firstPage();  
  do {
    draw();
  } 
  while( u8g.nextPage() );
 
  // rebuild the picture after some delay
  delay(500);
}
  • Please config the driving pin using this U8GLIB_NHD_C12864 u8g(13, 11, 10, 9, 8); command.. And notice to enable this command when using the u8glib example codes also.
  • Use "setContrast" to config the contrast as you want. We highly recommend you to setContrast to 0 to get the best display effect.
  • "setRot90/setRot180/setRot270" functions will be helpful to rotate the display direction as you want.Recommend to use setRot180.

Wiring

  • as defined in the demo code below:
  • U8GLIB_NHD_C12864 u8g(13, 11, 10, 9, 8); // SPI Com: SCK = 13, MOSI = 11, CS = 10, CD = 9, RST = 8
Arduino LCD12864
D13 SCK
D11 SDA
3V3 VDD, LEDA
GND VSS
D10 CS
D8 RST
D9 RS

12864g LCD arduino shield

Demo Code

  • remember to add contrast setting to set up the contrast of LCD
  • use example sketch analog read (but remove the equation and only read value straight) to read each button value and fit for: 4-up, 0-left, 2-down, 1-select, 3-right
 
 
#include "U8glib.h"
 
// setup u8g object, please remove comment from one of the following constructor calls
// IMPORTANT NOTE: The complete list of supported devices is here: http://code.google.com/p/u8glib/wiki/device
 
U8GLIB_NHD_C12864 u8g(13, 11, 10, 9, 8);	// SPI Com: SCK = 13, MOSI = 11, CS = 10, A0 = 9, RST = 8
 
#define KEY_NONE 0
#define KEY_PREV 1
#define KEY_NEXT 2
#define KEY_SELECT 3
#define KEY_BACK 4
 
 
uint8_t uiKeyCodeFirst = KEY_NONE;
uint8_t uiKeyCodeSecond = KEY_NONE;
uint8_t uiKeyCode = KEY_NONE;
 
int adc_key_in;
int key=-1;
int oldkey=-1;
 
 
// Convert ADC value to key number
//         4
//         |
//   0 --  1 -- 3
//         |
//         2
int get_key(unsigned int input)
{   
    if (input < 10) return 4;
    else  if (input < 200) return 0;
    else  if (input < 400) return 2;
    else  if (input < 600) return 1;
    else  if (input < 800) return 3;    
    else  return -1;
}
 
void uiStep(void) {
 
  adc_key_in = analogRead(0);    // read the value from the sensor  
  key = get_key(adc_key_in);	 // convert into key press	
  if (key != oldkey)	  // if keypress is detected
   {
    delay(50);		// wait for debounce time
    adc_key_in = analogRead(0);    // read the value from the sensor  
    key = get_key(adc_key_in);	   // convert into key press
    if (key != oldkey)				
    {			
      oldkey = key;
      if (key >=0){
             //Serial.println(key);
             if ( key == 0 )
               uiKeyCodeFirst = KEY_BACK;
             else if ( key == 1 )
               uiKeyCodeFirst = KEY_SELECT;
             else if ( key == 2 )
               uiKeyCodeFirst = KEY_NEXT;
             else if ( key == 4 )
               uiKeyCodeFirst = KEY_PREV;
             else 
               uiKeyCodeFirst = KEY_NONE;
 
             uiKeyCode = uiKeyCodeFirst;           
      }
    }
  }
 delay(100);
}
 
 
#define MENU_ITEMS 6
char *menu_strings[MENU_ITEMS] = { "LCD12864 Shield", "www.ElectroDragon.com", "Temperature", "Humidity" ,"About","OK"};
 
uint8_t menu_current = 0;
uint8_t menu_redraw_required = 0;
uint8_t last_key_code = KEY_NONE;
 
 
void drawMenu(void) {
  uint8_t i, h;
  u8g_uint_t w, d;
 
  u8g.setFont(u8g_font_6x12);//4x6 5x7 5x8 6x10 6x12 6x13
  u8g.setFontRefHeightText();
  u8g.setFontPosTop();
 
  h = u8g.getFontAscent()-u8g.getFontDescent();
  w = u8g.getWidth();
  for( i = 0; i < MENU_ITEMS; i++ ) {
    d = (w-u8g.getStrWidth(menu_strings[i]))/2;
    u8g.setDefaultForegroundColor();
    if ( i == menu_current ) {  
      u8g.drawBox(0, i*h+1, w, h);
      u8g.setDefaultBackgroundColor();
    }
    u8g.drawStr(d, i*h+1, menu_strings[i]);
  }
}
 
void updateMenu(void) 
{
  switch ( uiKeyCode ) {
    case KEY_NEXT:
      menu_current++;
      if ( menu_current >= MENU_ITEMS )menu_current = 0;
      menu_redraw_required = 1;
      break;
    case KEY_PREV:
      if ( menu_current == 0 )menu_current = MENU_ITEMS;
      menu_current--;
      menu_redraw_required = 1;
      break;
  }
  uiKeyCode = KEY_NONE;
}
 
 
void setup() {
   u8g.setContrast(0);
  u8g.setRot180();// rotate screen, if required
  menu_redraw_required = 1;     // force initial redraw
  //Serial.begin(9600);
}
 
void loop() {  
 
  uiStep();                                // check for key press
  updateMenu();                            // update menu bar    
 
  if (  menu_redraw_required != 0 ) {
    u8g.firstPage();
    do  {
      drawMenu();
    } while( u8g.nextPage() );
    menu_redraw_required = 0;
  }
 
}

Schematic

12864LCD.png