DHT90 程序(国外英文资料).docVIP

DHT90 程序(国外英文资料) DHT90 and LCD1602 temperature and humidity display source program /********************************************/ Function Description: DHT90 and LCD1602 temperature and humidity display KeilC program File name: DHT90.c Microprocessor: AT89S52 Compile environment: Keil uVision V2.38a Author: Huang Yanxiang Copyright: (c) Huang Yanxiang Creation date: 2008.08.15 Version: V1.2 Modified date: 2008.08.26 Modify Description: added a LCD_disp_str () function, modified the notes of the delay function. *************************************************************/; /************* definition interface ******************** P0------DB0 to DB7 (LCD1602) P2.0------RS (LCD1602) P2.1------RW (LCD1602) P2.2------E (LCD1602) P2.6------SCK (DHT90) P2.7------DATA (DHT90) *****************************************/ #include AT89x51.h #include intrins.h #include math.h //Keil Library #include stdio.h //Keil Library The first part of //********************* LCD1602 set START**************************************** #define LCD_DB P0 Sbit LCD_RS=P2^0; //P2^0 is the meaning of p2.0; LCD_RS and P2.0 equivalent, read and write to LCD_RS, that is, the advantages of reading and writing to P2.0 is that the meaning of LCD_RS is direct and clear, and when you write more programs, you will know that it is necessary to de Sbit LCD_RW=P2^1; //P2^1 is the meaning of p2.1 Sbit LCD_E=P2^2; //P2^2 is the meaning of p2.2 /****** defined function ****************/ #define uchar unsigned char #define uint unsigned int Void LCD_init (void); / / initialization function Void LCD_write_command (uchar command); / / write instruction function Void LCD_write_data (uchar DAT); / / write data function Void LCD_disp_char (uchar x, uchar y, uchar DAT); / / display a character in a screen position, X (0-15), y (1-2) Void LCD_disp_str (uchar, x, uchar, y, uchar, *str); //LCD1602 displays string functions Void delay_n10us (uint n); / / delay function /*-------------------------------------- Module name: LC