51与光敏电阻经典程序

1、.本程序是利用光敏电阻和51单片机来控制led灯亮灭#include /包含头文件，一般情况不需要改动，头文件包含特殊功能寄存定义#include /包含NOP空指令函数_nop_();#include#define AddWr 0x90 /写数据地址 #define AddRd 0x91 /读数据地址sbit RST=P24; /时钟 加上后可以关掉DS1302芯片输出sbit Sda=P20; /定义总线连接端口sbit Scl=P21;sbit dula=P26;sbit wela=P27;bit ADFlag; /定义AD采样标志位unsigned char code Datatab=

2、0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f;data unsigned char Display8;/定义临时存放数码管数值/*-延时程序-*/void mDelay(unsigned char j) unsigned int i; for(;j0;j-) for(i=0;i125;i+) ; /*-初始化定时器1-*/void Init_Timer1(void) TMOD |= 0x10; TH1=0xff; /* Init value */ TL1=0x00; /PT1=1; /* 优先级 */ EA=1; /* interupt e

3、nable */ ET1=1; /* enable timer1 interrupt */ TR1=1; /*-启动IIC总线-*/ void Start(void) Sda=1; _nop_(); Scl=1; _nop_(); Sda=0; _nop_(); Scl=0; /*-停止IIC总线-*/ void Stop(void) Sda=0; _nop_(); Scl=1; _nop_(); Sda=1; _nop_(); Scl=0; /*-应答IIC总线-*/ void Ack(void) Sda=0;_nop_();Scl=1;_nop_();Scl=0;_nop_();/*-非应

4、答IIC总线-*/void NoAck(void) Sda=1; _nop_(); Scl=1; _nop_(); Scl=0; _nop_(); /*-发送一个字节-*/ void Send(unsigned char Data) unsigned char BitCounter=8; unsigned char temp;do temp=Data; Scl=0; _nop_(); if(temp&0x80)=0x80) Sda=1; else Sda=0;Scl=1;temp=Data1;Data=temp;BitCounter-; while(BitCounter); Scl=0; /*

5、-读入一个字节并返-*/ unsigned char Read(void) unsigned char temp=0; unsigned char temp1=0; unsigned char BitCounter=8;Sda=1; do Scl=0; _nop_(); Scl=1; _nop_(); if(Sda) temp=temp|0x01; else temp=temp&0xfe;if(BitCounter-1) temp1=temp=250)P1 = 0X00;else if(ADtemp = 210)P1 = 0X80;else if(ADtemp = 180)P1 = 0Xc0;

6、else if(ADtemp = 150)P1 = 0Xe0;else if(ADtemp = 120)P1 = 0Xf0;else if(ADtemp = 90)P1 = 0Xf8;else if(ADtemp = 60)P1 = 0Xfc;else if(ADtemp = 30)P1 = 0Xfe; /*-定时器中断程序-*/void Timer1_isr(void) interrupt 3 using 1/定时器1执行数码管动态扫描 static unsigned int j; TH1=0xfb;/重新赋值 TL1=0x00; j+; if(j=200) j=0;ADFlag=1; /定

7、时置位AD采样标志位#include#include#includesbit RS = P35;/Pin4sbit RW = P36; /Pin5sbit E = P34;/Pin6#define Data P0 /数据端口unsigned char TempData8;unsigned char SecondLine= ;unsigned char FirstLine = ;void DelayUs(unsigned char us)/delay us unsigned char uscnt; uscnt=us1;/* Crystal frequency in 12MHz*/ while(-

8、uscnt);void DelayMs(unsigned char ms)/delay Ms while(-ms) DelayUs(250); DelayUs(250); DelayUs(250); DelayUs(250); void WriteCommand(unsigned char c) DelayMs(5);/short delay before operation E=0; RS=0; RW=0; _nop_(); E=1; Data=c; E=0;void WriteData(unsigned char c) DelayMs(5); /short delay before ope

9、ration E=0; RS=1; RW=0; _nop_(); E=1; Data=c; E=0; RS=0;void ShowChar(unsigned char pos,unsigned char c) unsigned char p; if (pos=0x10) p=pos+0xb0; /是第二行则命令代码高4位为0xc else p=pos+0x80; /是第二行则命令代码高4位为0x8 WriteCommand (p);/write command WriteData (c); /write datavoid ShowString (unsigned char line,char

10、*ptr) unsigned char l,i; l=line4; for (i=0;i16;i+) ShowChar (l+,*(ptr+i);/循环显示16个字符void InitLcd() DelayMs(15); WriteCommand(0x38); /display mode WriteCommand(0x38); /display mode WriteCommand(0x38); /display mode WriteCommand(0x06); /显示光标移动位置 WriteCommand(0x0c); /显示开及光标设置 WriteCommand(0x01); /显示清屏void disp(void) FirstLine2=0+TempData0; FirstLine4=0+TempData1; FirstLine3=.; FirstLine6=V;FirstLine9=0+TempData2; FirstLine11=0+TempData3; FirstLine10=.; FirstLine13=V;SecondLine2=0+TempData4; SecondLine4=0+Temp