单片机控制二氧化碳传感器程序

1、精选优质文档-倾情为你奉上#include <reg52.h> /头文件#include <intrins.h>#define uchar unsigned char /宏定义无符号字符型#define uint unsigned int /宏定义无符号整型typedef unsigned char BYTE;typedef bit BOOL; sbit ST=P30; /A/D启动转换信号sbit OE=P31; /数据输出允许信号sbit EOC=P32; /A/D转换结束信号sbit CLK=P33; /时钟脉冲 sbit LCD_RS = P20; sbit L

2、CD_RW = P21;sbit LCD_EN = P22;uchar m;uint AD0809,i,cdisplay,ppm;uint ppmdou;/定义数据类型void delay(int ms) / 延时子程序while(ms-) for(i = 0; i< 250; i+) _nop_(); _nop_(); _nop_(); _nop_(); BOOL lcd_bz() / 测试LCD忙碌状态BOOL result;LCD_RS = 0;LCD_RW = 1;LCD_EN = 1;_nop_();_nop_();_nop_();_nop_();result = (BOOL)

3、(P0 & 0x80);LCD_EN = 0;return result; void lcd_wcmd(BYTE cmd) / 写入指令数据到LCDwhile(lcd_bz();LCD_RS = 0;LCD_RW = 0;LCD_EN = 0;_nop_();_nop_(); P0 = cmd;_nop_();_nop_();_nop_();_nop_();LCD_EN = 1;_nop_();_nop_();_nop_();_nop_();LCD_EN = 0; void lcd_pos(BYTE pos) /设定显示位置lcd_wcmd(pos | 0x80);void lcd_w

4、dat(BYTE dat) /写入字符显示数据到LCDwhile(lcd_bz();LCD_RS = 1;LCD_RW = 0;LCD_EN = 0;P0 = dat;_nop_();_nop_();_nop_();_nop_();LCD_EN = 1;_nop_();_nop_();_nop_();_nop_();LCD_EN = 0; void lcd_init() /LCD初始化设定lcd_wcmd(0x38); /16*2显示，5*7点阵，8位数据delay(1);lcd_wcmd(0x0c); /显示开，关光标delay(1);lcd_wcmd(0x06); /移动光标delay(1

5、);lcd_wcmd(0x01); /清除LCD的显示内容delay(1);void timer0( ) interrupt 1 /定时器0工作方式1TH0=(65536-2)/256; /重装计数初值TL0=(65536-2)%256; /重装计数初值CLK=!CLK; /取反 /* 主函数*/ void main() lcd_init(); / 初始化LCD delay(10);TMOD=0X01; /定时器中断0CLK=0; /脉冲信号初始值为0TH0=(65536-2)/256; /定时时间高八位初值TL0=(65536-2)%256; /定时时间低八位初值EA=1; /开CPU中断E

6、T0=1; /开T/C0中断TR0=1;ST=0;OE=0; while(1) /无限循环ST=0;/使采集信号为低ST=1;/开始数据转换ST=0;/停止数据转换while(!EOC);/等待数据转换完毕OE=1;/允许数据输出信号m=P1; /读取数据OE=0; /关闭数据输出允许信号 AD0809=(uint)m; cdisplay = (uint)(AD0809*(5.00/255)*1000); if(cdisplay>1072) ppm=400; else if(1049<cdisplay)&&(cdisplay<=1072) ppmdou = (

7、500-(cdisplay-1049)*(100/(1072-1049);ppm = (uint)ppmdou; else if(1036<cdisplay)&&(cdisplay<=1049) ppmdou = (600-(cdisplay-1036)*(100/(1049-1036); /ppmdou = (500-(ppmd-1049)*(100/(1072-1049);ppm = (uint)ppmdou; else if(1023<cdisplay)&&(cdisplay<=1036) ppmdou = (700-(cdispl

8、ay-1023)*(100/(1036-1023); ppm = (uint)ppmdou; else if(1016<cdisplay)&&(cdisplay<=1023) ppmdou = (800-(cdisplay-1016)*(100/(1023-1016); ppm = (uint)ppmdou; else if(1006<cdisplay)&&(cdisplay<=1016) ppmdou = (900-(cdisplay-1006)*(100/(1016-1006); ppm = (uint)ppmdou; elseif(

9、1000<cdisplay)&&(cdisplay<=1006) ppmdou = (1000-(cdisplay-1000)*(100/(1016-1000); ppm = (uint)ppmdou; else if(966<cdisplay)&&(cdisplay<=1000) ppmdou = (2000-(cdisplay-966)*(1000/(1000-966); ppm = (uint)ppmdou; else if(947<cdisplay)&&(cdisplay<=966) /2000-300

10、0 ppmdou = (3000-(cdisplay-947)*(1000/(966-947); ppm = (uint)ppmdou; else if(924<cdisplay)&&(cdisplay<=947)/3000-4000 ppmdou = (4000-(cdisplay-924)*(1000/(947-924); ppm = (uint)ppmdou; else if(907<cdisplay)&&(cdisplay<=924)/4000-6000 ppmdou = (6000-(cdisplay-907)*(2000/(9

11、24-907); ppm = (uint)ppmdou; else if(891<cdisplay)&&(cdisplay<=907)/6000-8000 ppmdou = (8000-(cdisplay-891)*(2000/(907-891); ppm = (uint)ppmdou; else if(874<cdisplay)&&(cdisplay<=891)/8000-10000 ppmdou = (10000-(cdisplay-874)*(2000/(891-874); ppm = (uint)ppmdou; else if(0<cdisplay)&&(cdisplay<=874)/8000-10000 ppm = 10000; lcd_pos(0x81); lcd_wdat(ppm/10000+0x30); lcd_pos(0x82); lcd_wdat(ppm%10000)/1000+0x30); lcd_pos(0x83); lcd_wdat(ppm%1000)/100+0x30); lcd_pos(0x84); lcd