LCD4884_Shield_兼容Arduino_SKU_DFR0092

概述

LCD4884 shield的一款84x48点阵液晶显示器,Arduino叠层设计,可直接插接到大部分Arduino控制器上使用,可显示中文、英文、图片等。模块具有5个模拟扩展端口和6个数字扩展端口,可连接DFRobot大部分的模拟或数字传感器,还具有一个小型的手机摇杆,可实现5个按键操作。LCD4884 shield是项目开发和制作互动作品不可多得的显示器。

技术规格

LCD4884 Shield工作电压：5v
液晶点阵：84x48
使用SPI通讯接口（占用数字口PIN2、3、4、5、6）
1个复位按键
1个手机摇杆,实现5个按键操作（占用模拟口PIN0）
具有背光控制（占用数字口PIN7）
调用库文件可直接使用Arduino控制器驱动
尺寸：60x55x20mm

示例代码

代码库文件下载

#include "LCD4884.h"
#include "DFrobot_bmp.h"
#include "DFrobot_chinese.h"

//keypad debounce parameter
#define DEBOUNCE_MAX 15
#define DEBOUNCE_ON  10
#define DEBOUNCE_OFF 3

#define NUM_KEYS 5

#define NUM_MENU_ITEM   4

// joystick number
#define LEFT_KEY 0
#define CENTER_KEY 1
#define DOWN_KEY 2
#define RIGHT_KEY 3
#define UP_KEY 4

// menu starting points

#define MENU_X  10      // 0-83
#define MENU_Y  1       // 0-5


int  adc_key_val[5] ={50, 200, 400, 600, 800 };

// debounce counters
byte button_count[NUM_KEYS];
// button status - pressed/released
byte button_status[NUM_KEYS];
// button on flags for user program
byte button_flag[NUM_KEYS];

// menu definition
char menu_items[NUM_MENU_ITEM][12]={
    "TEMPERATURE",
    "CHAR MAP",
    "BITMAP",
    "ABOUT"
};

void (*menu_funcs[NUM_MENU_ITEM])(void) = {
    temperature,
    charmap,
    bitmap,
    about
};

char current_menu_item;


void setup()
{

   // setup interrupt-driven keypad arrays
   // reset button arrays
   for(byte i=0; i<NUM_KEYS; i++){
     button_count[i]=0;
     button_status[i]=0;
     button_flag[i]=0;
   }

  // Setup timer2 -- Prescaler/256
  TCCR2A &= ~((1<<WGM21) | (1<<WGM20));
  TCCR2B &= ~(1<<WGM22);
  TCCR2B = (1<<CS22)|(1<<CS21);

  ASSR |=(0<<AS2);

   // Use normal mode
   TCCR2A =0;
   //Timer2 Overflow Interrupt Enable
   TIMSK2 |= (0<<OCIE2A);
   TCNT2=0x6;  // counting starts from 6;
   TIMSK2 = (1<<TOIE2);



  SREG|=1<<SREG_I;

  lcd.LCD_init();
  lcd.LCD_clear();

   //menu initialization
   init_MENU();
   current_menu_item = 0;
}


/* loop */

void loop()
{
    byte i;
    for(i=0; i<NUM_KEYS; i++){
       if(button_flag[i] !=0){

            button_flag[i]=0;  // reset button flag
            switch(i){

                case UP_KEY:
                    // current item to normal display
                    lcd.LCD_write_string(MENU_X, MENU_Y + current_menu_item, menu_items[current_menu_item], MENU_NORMAL );
                    current_menu_item -=1;
                    if(current_menu_item <0)  current_menu_item = NUM_MENU_ITEM -1;
                    // next item to highlight display
                    lcd.LCD_write_string(MENU_X, MENU_Y + current_menu_item, menu_items[current_menu_item], MENU_HIGHLIGHT );
                    break;
                case DOWN_KEY:
                // current item to normal display
                    lcd.LCD_write_string(MENU_X, MENU_Y + current_menu_item, menu_items[current_menu_item], MENU_NORMAL );
                    current_menu_item +=1;
                    if(current_menu_item >(NUM_MENU_ITEM-1))  current_menu_item = 0;
                    // next item to highlight display
                    lcd.LCD_write_string(MENU_X, MENU_Y + current_menu_item, menu_items[current_menu_item], MENU_HIGHLIGHT );
                    break;
                case LEFT_KEY:
                                  init_MENU();
                    current_menu_item = 0;
                    break;
                case CENTER_KEY:
                                lcd.LCD_clear();
                    (*menu_funcs[current_menu_item])();
                                  lcd.LCD_clear();
                    init_MENU();
                    current_menu_item = 0;
                    break;
            }

        }
    }
}

/* menu functions */

void init_MENU(void){

  byte i;

  lcd.LCD_clear();

    lcd.LCD_write_string(MENU_X, MENU_Y, menu_items[0], MENU_HIGHLIGHT );

  for (i=1; i<NUM_MENU_ITEM; i++){
    lcd.LCD_write_string(MENU_X, MENU_Y+i, menu_items[i], MENU_NORMAL);
  }


}

// waiting for center key press
void waitfor_OKkey(){
  byte i;
  byte key = 0xFF;
    while (key!= CENTER_KEY){
    for(i=0; i<NUM_KEYS; i++){
       if(button_flag[i] !=0){
           button_flag[i]=0;  // reset button flag
           if(i== CENTER_KEY) key=CENTER_KEY;
        }
     }
   }

}

void temperature()
{
        lcd.LCD_write_string_big(10, 1, "+12.30", MENU_NORMAL);
        lcd.LCD_write_string(78, 2, "C", MENU_NORMAL);
        lcd.LCD_write_string(38, 5, "OK", MENU_HIGHLIGHT );
    waitfor_OKkey();
}

void charmap(){
  char i,j;
   for(i=0; i<5; i++){
    for(j=0; j<14; j++){
      lcd.LCD_set_XY(j*6,i);
      lcd.LCD_write_char(i*14+j+32, MENU_NORMAL);
      }
    }


  lcd.LCD_write_string(38, 5, "OK", MENU_HIGHLIGHT );
    waitfor_OKkey();
}

void bitmap(){
  lcd.LCD_draw_bmp_pixel(0,0, DFrobot_bmp, 84,24);
  lcd.LCD_write_chinese(6,3, DFrobot_chinese,12,6,0,0);
  lcd.LCD_write_string(38, 5, "OK", MENU_HIGHLIGHT );
  waitfor_OKkey();
}


void about(){

  lcd.LCD_write_string( 0, 1, "LCD4884 Shield", MENU_NORMAL);
  lcd.LCD_write_string( 0, 3, "www.DFrobot.cn", MENU_NORMAL);
  lcd.LCD_write_string(38, 5, "OK", MENU_HIGHLIGHT );
  waitfor_OKkey();


}



// The followinging are interrupt-driven keypad reading functions
// which includes DEBOUNCE ON/OFF mechanism, and continuous pressing detection


// Convert ADC value to key number
char get_key(unsigned int input)
{
    char k;

    for (k = 0; k < NUM_KEYS; k++)
    {
        if (input < adc_key_val[k])
        {

    return k;
        }
    }

    if (k >= NUM_KEYS)
        k = -1;     // No valid key pressed

    return k;
}

void update_adc_key(){
  int adc_key_in;
  char key_in;
  byte i;

  adc_key_in = analogRead(0);
  key_in = get_key(adc_key_in);
  for(i=0; i<NUM_KEYS; i++)
  {
    if(key_in==i)  //one key is pressed
    {
      if(button_count[i]<DEBOUNCE_MAX)
      {
        button_count[i]++;
        if(button_count[i]>DEBOUNCE_ON)
        {
          if(button_status[i] == 0)
          {
            button_flag[i] = 1;
            button_status[i] = 1; //button debounced to 'pressed' status
          }

        }
      }

    }
    else // no button pressed
    {
      if (button_count[i] >0)
      {
        button_flag[i] = 0;
        button_count[i]--;
        if(button_count[i]<DEBOUNCE_OFF){
          button_status[i]=0;   //button debounced to 'released' status
        }
      }
    }

  }
}

// Timer2 interrupt routine -
// 1/(160000000/256/(256-6)) = 4ms interval

ISR(TIMER2_OVF_vect) {
  TCNT2  = 6;
  update_adc_key();
}

在屏幕上显示一个变量的值的草图

/*
 Modified by Lauren
 version 0.1

 Any suggestions are welcome.
 E-mail: Lauran.pan@gmail.com

 Editor     : Lauren from DFRobot
 Date       : 26.03.2012

 * This is a sample sketch for displaying a variable value on the LCD4884
 * This library and sample is compatible with the IDE V1.0 and earlier

 Connection:

 Directly stack the LCD4884 shield on your Arduino board

*/

#include "LCD4884.h"

#define MENU_X  10      // 0-83
#define MENU_Y  1       // 0-5

int counter = 0;
char string[10];

void setup()
{

  lcd.LCD_init();
  lcd.LCD_clear();

  //menu initialization
  init_MENU();
}

void init_MENU(void){

  byte i;
  lcd.LCD_clear();
  lcd.LCD_write_string(MENU_X, MENU_Y, "test screen", MENU_HIGHLIGHT );

}

void loop(){

  if(++counter < 1000){
    itoa(counter,string,10);
    lcd.LCD_write_string(MENU_X, MENU_Y + 1, string, MENU_NORMAL);
  }
  else  counter = 0,init_MENU();
  delay(10);

}

版本说明

LCD4884 Shield V1.2

LCD4884 Shield V1.1 LCD4884 Shield V1.2


版本号	更改时间	备注
V1.1	2010年7月22日	新产品投产
V1.2	2012年7月3日	1.修改V1.1存在的bug；2.修改模拟口为数字接口线序。

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category: Product Manual category: DFR Series category: Shields category: LCDs category: source