LCD4884 Shield 兼容Arduino(SKU:DFR0092)
来自DFRobot Product Wiki
目录 |
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
#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 V1.1 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。 |
