diff --git a/Central_Control_Board/LCD.c b/Central_Control_Board/LCD.c
new file mode 100644
index 0000000000000000000000000000000000000000..b9f429536978ecb5ccd848c44edf70a963b9fdf6
--- /dev/null
+++ b/Central_Control_Board/LCD.c
@@ -0,0 +1,189 @@
+#include "JaeYukBookkom.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/i2c-dev.h>
+#include "LCD.h"
+
+LCDDevice lcd1, lcd2, lcd_error;
+
+int LCD_init(void){
+ LCDDevice **initlist = malloc(LCD_COUNT * sizeof(LCDDevice *));
+ initlist[0] = &lcd1, initlist[1] = &lcd2, initlist[2] = &lcd_error;
+
+ if (LCD_open(&lcd1, 0x23, BUS_NUMBER) < 0 || LCD_open(&lcd2, 0x26, BUS_NUMBER) < 0 || LCD_open(&lcd_error, 0x27, BUS_NUMBER) < 0)
+ {
+ return -1;
+ }
+ for (int i = 0; i < LCD_COUNT; i++)
+ {
+ LCD_write(initlist[i], 0x03, 0);
+ LCD_write(initlist[i], 0x03, 0);
+ LCD_write(initlist[i], 0x03, 0);
+ LCD_write(initlist[i], 0x02, 0);
+ LCD_write(initlist[i], LCD_FUNCTIONSET | LCD_2LINE | LCD_5x8DOTS | LCD_4BITMODE, 0);
+ LCD_write(initlist[i], LCD_DISPLAYCONTROL | LCD_DISPLAYON, 0);
+ LCD_write(initlist[i], LCD_CLEARDISPLAY, 0);
+ LCD_write(initlist[i], LCD_ENTRYMODESET | LCD_ENTRYLEFT, 0);
+ LCD_clear(initlist[i]);
+ LCD_display_string(initlist[i], "S A T ", 1);
+ LCD_display_string(initlist[i], " T R ", 2);
+ }
+
+ usleep(5000000);
+ for (int i = 0; i < LCD_COUNT; i++)
+ {
+ LCD_clear(initlist[i]);
+ }
+ free(initlist);
+}
+void LCD_weather_prediction(float temp, float hyd, int weatherCode, int dust, int rainPer){
+ LCD_clear(&lcd1);
+ char str[16];
+ snprintf(str, 16, "%.1f C, %.1f %", temp, hyd);
+ LCD_display_string(&lcd1, str, 1);
+/*
+ Sunny = 0,
+ Cloud,
+ Windy,
+ Rain,
+ Snow
+*/
+ if (weatherCode == Sunny)
+ snprintf(str, 16, "Sunny");
+ else if (weatherCode == Cloud)
+ snprintf(str, 16, "Cloud");
+ else if (weatherCode == Windy)
+ snprintf(str, 16, "Windy");
+ else if (weatherCode == Rain)
+ snprintf(str, 16, "Rain");
+ else if (weatherCode == Snow)
+ snprintf(str, 16, "Snow");
+ LCD_display_string(&lcd1, str, 2);
+ LCD_clear(&lcd2);
+ if(dust > 100)
+ snprintf(str, 16, "dust: BAD(%d)",dust);
+ else
+ snprintf(str, 16, "dust: GOOD(%d)",dust);
+ LCD_display_string(&lcd2, str, 1);
+
+ if(rainPer>60)
+ snprintf(str,16,"!!!!!rainPer: %d",rainPer);
+ else
+ snprintf(str,16,"rainPer : %d",rainPer);
+ LCD_display_string(&lcd2, str, 2);
+}
+void LCD_messaging_error(int errorcode){
+ if (errorcode == 0)
+ {
+ LCD_clear(&lcd_error);
+ LCD_display_string(&lcd_error, "Nothing Problem", 1);
+ LCD_display_string(&lcd_error, "Outdoor is GOOD", 2);
+ }
+ else if (errorcode == 1)
+ {
+ LCD_clear(&lcd_error);
+ LCD_display_string(&lcd_error, "Raining", 1);
+ LCD_display_string(&lcd_error, "Outdoor is BAD", 2);
+ }
+ else if (errorcode == 2)
+ {
+ LCD_clear(&lcd_error);
+ LCD_display_string(&lcd_error, "Gas", 1);
+ LCD_display_string(&lcd_error, "Outdoor is BAD", 2);
+ }
+ else if (errorcode == 3)
+ {
+ LCD_clear(&lcd_error);
+ LCD_display_string(&lcd_error, "Raining, Dust", 1);
+ LCD_display_string(&lcd_error, "Outdoor is BAD", 2);
+ }
+ else if (errorcode == 4)
+ {
+ LCD_clear(&lcd_error);
+ LCD_display_string(&lcd_error, "Noisy", 1);
+ LCD_display_string(&lcd_error, "Outdoor is BAD", 2);
+ }
+ else if (errorcode == 5)
+ {
+ LCD_clear(&lcd_error);
+ LCD_display_string(&lcd_error, "Raining, Noisy", 1);
+ LCD_display_string(&lcd_error, "Outdoor is BAD", 2);
+ }
+ else if (errorcode == 6)
+ {
+ LCD_clear(&lcd_error);
+ LCD_display_string(&lcd_error, "Dust, Noisy", 1);
+ LCD_display_string(&lcd_error, "Outdoor is BAD", 2);
+ }
+ else if (errorcode == 7)
+ {
+ LCD_clear(&lcd_error);
+ LCD_display_string(&lcd_error, "Rain,Dust,Noisy", 1);
+ LCD_display_string(&lcd_error, "Outdoor is BAD", 2);
+ }
+ else if (errorcode == 8)
+ {
+ LCD_clear(&lcd_error);
+ LCD_display_string(&lcd_error, "Danger", 1);
+ LCD_display_string(&lcd_error, "Check Window", 2);
+ }
+}
+int LCD_open(LCDDevice *dev, int addr, int bus){
+ char filename[20];
+ snprintf(filename, 19, "/dev/i2c-%d", bus);
+ dev->file = open(filename, O_RDWR);
+ if (dev->file < 0)
+ {
+ perror("Failed to open the i2c bus");
+ return -1;
+ }
+ dev->addr = addr;
+ dev->bus = bus;
+ if (ioctl(dev->file, I2C_SLAVE, dev->addr) < 0)
+ {
+ perror("Failed to acquire bus access and/or talk to slave");
+ return -1;
+ }
+ return 0;
+}
+void LCDdispose(void){
+ close(lcd1.file);
+ close(lcd2.file);
+ close(lcd_error.file);
+}
+void i2c_write_cmd(LCDDevice *dev, uint8_t cmd){
+ if (write(dev->file, &cmd, 1) != 1)
+ perror("Failed to write command to the i2c bus");
+ usleep(100);
+}
+void LCD_strobe_signal(LCDDevice *dev, uint8_t data){ // strobe signal: notify send data
+ i2c_write_cmd(dev, data | En | LCD_BACKLIGHT);
+ usleep(500);
+ i2c_write_cmd(dev, ((data & ~En) | LCD_BACKLIGHT));
+ usleep(100);
+}
+void LCD_write(LCDDevice *dev, uint8_t cmd, uint8_t mode){
+ i2c_write_cmd(dev, mode | (cmd & 0xF0) | LCD_BACKLIGHT);
+ LCD_strobe_signal(dev, mode | (cmd & 0xF0));
+ i2c_write_cmd(dev, mode | ((cmd << 4) & 0xF0) | LCD_BACKLIGHT);
+ LCD_strobe_signal(dev, mode | ((cmd << 4) & 0xF0));
+}
+void LCD_display_string(LCDDevice *dev, const char *string, int line){
+ if(line == 1) LCD_write(dev, 0x80, 0);
+ else if(line == 2) LCD_write(dev, 0xC0, 0);
+
+ while (*string){
+ LCD_write(dev, *string++, Rs);
+ }
+}
+void LCD_clear(LCDDevice *dev) //clear display
+{
+ LCD_write(dev, LCD_CLEARDISPLAY, 0);
+ LCD_write(dev, LCD_RETURNHOME, 0);
+}
+