LED点阵数字钟与温度计.doc

LED点阵数字钟与温度计一、 系统设计方案本LED点阵数字钟基于STC89C52RC单片机设计，使用5片6*7的LED点阵作为显示屏。通过设计系统可以完成显示时间，日期，并增加了用DS18B20温度传感器显示温度的功能。同时，通过程序的改变可以为点阵数字钟扩充例如闹钟，字幕滚屏等功能。 LED点阵数字钟通过单片机来完成计时，设定，温度测量等功能。显示部分通过74HC595通用移位寄存器,完成点阵屏幕与单片机连接从而完成显示部分的功能。其系统组成框图如下：按键1按键2按键3STC89C52RCDS1302274HC595LED点阵图1二、 单元电路设计1.MCU控制部分单片机的时钟周期由外部12M晶振，时间信息则通过DS1302产生。DS1302通过串行方式与单片机进行数据传送,能够向单片机提供包括秒、分、时、日、月、年等在内的实时时间信息,并可对月末日期、闰年天数自动进行调整;它还拥有用于主电源和备份电源的双电源引脚,在主电源关闭的情况下,也能保持时钟的连续运行。从而完成断电计时的功能。其中DS1302采用32.768KHz的晶振提供时钟周期（原理图见附录1）2.LED点阵显示部分 74HC595通用移位寄存器并行输出端具有输出锁存功能。与单片机连接简单方便，只须三个I/O口即可。而且通过芯片的Q7引脚和SER引脚，可以级联。点阵屏幕由5片6*7的LED点阵组成。采用74HC595来实现时钟的动态显示。点阵屏幕段选码由4片74HC595控制，段选数据由74HC595的SER引脚串行输入，由于输出使能时钟RCLK并接在一起，因此，4片74HC595并行输出端同时输出。而5个点阵位选信号也并接在一起，因此，一次可以同时点亮4列此过程类似于静态显示。每片74HC595并行输出端并接到点阵的每一位的引脚，用于扫描输出，此过程类似于动态扫描过程。此方法运用4片74HC595，7条位选信号，从而实现LED点阵的显示.其中位选控制端为通过经三极管放大后的P2口输出信号控制。（原理图见附录2）3.电源部分采用普通电源接口和USB接口，可以使用5V，400mA电源供电，亦可使用电脑USB供电。预设备用电源纽扣电池接口，保证时钟断电后继续走时。三、 程序设计1. 定义字符#include reg52.h#define uchar unsigned char #define uint unsigned int/74HC595管脚定义sbit S_DIO = P30; sbit S_CLK = P31; sbit R_CLK = P32;/按键管脚定义sbit KEY_1 = P11; sbit KEY_2 = P12; sbit KEY_3 = P10;/蜂鸣器管脚定义sbit BEEP = P27;/DS18B20管脚定义sbit DQ = P34;uchar temp_value; unsigned char tempL=0; /设全局变量unsigned char tempH=0; unsigned int sdata;/测量到的温度的整数部分unsigned char xiaoshu1;/小数第一位unsigned char xiaoshu2;/小数第二位unsigned char xiaoshu;/两位小数bit fg=1; /温度正负标志，等于0时为负数/DS1302管脚定义sbit T_CLK = P35; sbit T_IO = P36; sbit T_RST = P37; sbit ACC0 = ACC0;sbit ACC1 = ACC1;sbit ACC2 = ACC2;sbit ACC3 = ACC3;sbit ACC4 = ACC4;sbit ACC5 = ACC5;sbit ACC6 = ACC6;sbit ACC7 = ACC7;bit distime,disdate,disyear,distweek,diswendu,setyear,setdate,settime,setalarm,setweek;unsigned char code Bmp74= 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, 0xff,0xff,0xff,0xff, ;unsigned char code font7= 0x38,0x44,0x64,0x54,0x4C,0x44,0x38,/0xF8,0x88,0x88,0x88,0x88,0x88,0xF8, /-0 0x10,0x18,0x10,0x10,0x10,0x10,0x38,/0x20,0x30,0x28,0x20,0x20,0x20,0xF8, /-1 0x38,0x44,0x40,0x20,0x10,0x08,0x7C,/0xF8,0x80,0x80,0xF8,0x08,0x08,0xF8, /-2 0x7C,0x20,0x10,0x20,0x40,0x44,0x38,/0xF8,0x80,0x80,0xF8,0x80,0x80,0xF8, /-3 0x20,0x30,0x28,0x24,0x7C,0x20,0x20,/0x48,0x48,0x48,0x48,0xF8,0x40,0x40, /-4 0x7C,0x04,0x3C,0x40,0x40,0x44,0x38,/0xF8,0x08,0x08,0xF8,0x80,0x80,0xF8, /-5 0x70,0x08,0x04,0x3C,0x44,0x44,0x38,/0xF8,0x08,0x08,0xF8,0x88,0x88,0xF8, /-6 0x7C,0x40,0x20,0x10,0x08,0x08,0x08,/0xF8,0x80,0x80,0x80,0x80,0x80,0x80, /-7 0x38,0x44,0x44,0x38,0x44,0x44,0x38,/0xF8,0x88,0x88,0xF8,0x88,0x88,0xF8, /-8 0x38,0x44,0x44,0x78,0x40,0x20,0x1C,/0xF8,0x88,0x88,0xF8,0x80,0x80,0x80, /-9 0x00,0x30,0x30,0x00,0x30,0x30,0x00, /-10-: 0x78,0x48,0x78,0x48,0x78,0x48,0x64, /-11-月0x78,0x48,0x48,0x78,0x48,0x48,0x78, /-12-日0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, /-13- 0x00,0x00,0x00,0x00,0x00,0x00,0x00, /-14- 0x3C,0x44,0x44,0x44,0x44,0x44,0x3C, /-15- D0x44,0x44,0x44,0x28,0x10,0x10,0x10, /-16- Y 0x08,0xF8,0x24,0xF8,0x28,0xFC,0x20, /-17-年0x88,0xA8,0xA8,0xA8,0xA8,0xF8,0x70, /-18- W0x88,0x48,0x28,0x18,0x28,0x48,0x88,/-19- K0x00,0x00,0x00,0x38,0x00,0x00,0x00,/-20-0x00,0x00,0x00,0x00,0x00,0x30,0x30, /-21-.0xE8,0x10,0x10,0x10,0x10,0x10,0xE0, /-22- ;unsigned char idata DisTemp57;unsigned char idata Dis5;/时钟数据(7字节BCD码)格式为： 秒 分 时 日 月星期 年unsigned char idata Time7;/=0x30,0x42,0x23,0x18,0x06,0x04,0x09;unsigned char idata alarm2=0x30,0x06;uchar alarm_hh,alarm_ss,alarm_fg,alarm_off,flag;/闹钟unsigned char idata CSRow7=0x01,0x02,0x04,0x08,0x10,0x20,0x40;unsigned char idata second,minute,hour,day,month,week,year,time_revise;unsigned char idata keyvalue;unsigned long int idata Disbuf5;unsigned long int idata Disbuftemp7;unsigned int ss,i,TimeT1;/* * 函数名： Delay * 功能描述：延时（带参数） */ void Delay(unsigned int i) unsigned int j;for(j=0;j0; i-) T_IO = ACC0; T_CLK = 1; T_CLK = 0; ACC = ACC 1; /* * 函数名： ReadByteDS1302 * 功能描述： */ unsigned char ReadByteDS1302(void) unsigned char i; for(i=8; i0; i-) ACC = ACC 1; ACC7 = T_IO; T_CLK = 1; T_CLK = 0; return(ACC); /* * 函数名： WriteDS1302 * 功能描述： */ void WriteDS1302(unsigned char Addr,unsigned char Data) T_RST = 0; T_CLK = 0; T_RST = 1; WriteByteDS1302(Addr); WriteByteDS1302(Data); T_CLK = 1; T_RST = 0;/* * 函数名： ReadDS1302 * 功能描述： */ unsigned char ReadDS1302(unsigned char Addr) unsigned char Data; T_RST = 0; T_CLK = 0; T_RST = 1; WriteByteDS1302(Addr); Data = ReadByteDS1302(); T_CLK = 1; T_RST = 0; return(Data);/* * 函数名： Set * 功能描述：设置 * */ void Set(unsigned char sel,unsigned char selby) unsigned char address,item; unsigned char max,min; if(sel=0) address=0x80; max=59;min=0; /秒 if(sel=1) address=0x82; max=59;min=0; /分钟 if(sel=2) address=0x84; max=23;min=0; /小时 if(month=2)if(flag=1)if(sel=3) address=0x86; max=28;min=1; elseif(sel=3) address=0x86; max=27;min=1;else if(month=1|month=3|month=5|month=7|month=8|month=10|month=12) if(sel=3) address=0x86; max=31;min=1;if(month=4|month=6|month=9|month=11) if(sel=3) address=0x86; max=30;min=1;if(sel=4) address=0x88; max=12;min=1; /月 if(sel=5) address=0x8a; max=7; min=1; /星期 if(sel=6) address=0x8c; max=99;min=0; /年 if(sel=7) address=0xc0; max=59;min=0; /闹钟分钟 if(sel=8) address=0xc2; max=23;min=0; /闹钟小时 item=ReadDS1302(address+1)/16*10+ReadDS1302(address+1)%16; if (selby=0) item+; else item-; if(itemmax) item=min; if(item0; h-) WriteDS1302(Addr,*pClock); pClock+; Addr+=2; WriteDS1302(0x90,0xa5); WriteDS1302(0x8e,0x80); /* * 函数名： ReadTime * 功能描述： */ void ReadTime() Second = BCD2HEX(Time0=ReadDS1302(0x81); minute = BCD2HEX(Time1=ReadDS1302(0x83);hour = BCD2HEX(Time2=ReadDS1302(0x85);day = BCD2HEX(Time3=ReadDS1302(0x87);month = BCD2HEX(Time4=ReadDS1302(0x89);year = BCD2HEX(Time5=ReadDS1302(0x8d); week = BCD2HEX(Time6=ReadDS1302(0x8b);alarm_ss = BCD2HEX(alarm0=ReadDS1302(0xc1);alarm_hh = BCD2HEX(alarm1=ReadDS1302(0xc3); /* * 函数名： WriteTime * 功能描述： */ void WriteTime()WriteDS1302(0x8e,0x00); WriteDS1302(0x80,HEX2BCD(second);WriteDS1302(0x82,HEX2BCD(minute);WriteDS1302(0x84,HEX2BCD(hour);WriteDS1302(0x86,HEX2BCD(day);WriteDS1302(0x88,HEX2BCD(month);WriteDS1302(0x8A,HEX2BCD(week);WriteDS1302(0x8C,HEX2BCD(year);WriteDS1302(0xc0,HEX2BCD(alarm_ss);WriteDS1302(0xc2,HEX2BCD(alarm_hh); WriteDS1302(0x90,0xa5); WriteDS1302(0x8e,0x80);/* * 函数名： StopTime * 功能描述： */ void StopTime() second = BCD2HEX(Time0=ReadDS1302(0x81); WriteDS1302(0x8e,0x00); WriteDS1302(0x80,HEX2BCD(second)|0x80); WriteDS1302(0x90,0xa5); WriteDS1302(0x8e,0x80);/* * 函数名： StartTime * 功能描述： */ void StartTime() WriteDS1302(0x8e,0x00); WriteDS1302(0x80,HEX2BCD(second)&0x7f); WriteDS1302(0x90,0xa5); WriteDS1302(0x8e,0x80);/温度处理程序/*ds18b20延迟子函数（晶振12MHz ）*/ void delay_18B20(unsigned int i)while(i-);/*ds18b20初始化函数*/void Init_DS18B20(void) unsigned char x=0; DQ = 1; /DQ复位 delay_18B20(16); /稍做延时 DQ = 0; /单片机将DQ拉低 delay_18B20(160); /精确延时 大于 480us DQ = 1; /拉高总线 delay_18B20(28); x=DQ; /稍做延时后 如果x=0则初始化成功 x=1则初始化失败 delay_18B20(40);/*ds18b20读一个字节*/ unsigned char ReadOneChar(void)uchar i=0;uchar dat = 0;for (i=8;i0;i-) DQ = 0; / 给脉冲信号 dat=1; DQ = 1; / 给脉冲信号 if(DQ) dat|=0x80; delay_18B20(8); return(dat);/*ds18b20写一个字节*/ void WriteOneChar(uchar dat) unsigned char i=0; for (i=8; i0; i-) DQ = 0; DQ = dat&0x01; delay_18B20(10); DQ = 1; dat=1; /*读取ds18b20当前温度*函数名：ReadTemperature(void)*功能描述：读温度值（低位放tempL;高位放tempH;）*/ void ReadTemp(void) Init_DS18B20(); /初始化 WriteOneChar(0xcc); /跳过读序列号的操作 WriteOneChar(0x44); /启动温度转换 delay_18B20(200); /转换需要一点时间，延时 Init_DS18B20(); /初始化 WriteOneChar(0xcc); /跳过读序列号的操作 WriteOneChar(0xbe); /读温度寄存器（头两个值分别为温度的低位和高位） tempL=ReadOneChar(); /读出温度的低位LSB tempH=ReadOneChar(); /读出温度的高位MSB if(tempH0x7f) /最高位为1时温度是负 tempL=tempL+1; /补码转换，取反加一 tempH=tempH; fg=0; /读取温度为负时fg=0 else fg=1;sdata = tempL/16+tempH*16; /整数部分xiaoshu1 = (tempL&0x0f)*10/16; /小数第一位xiaoshu2 = (tempL&0x0f)*100/16;/小数第二位xiaoshu=xiaoshu1*10+xiaoshu2; /小数两位/温度处理程序结束/* * 函数名： DisPlay * 功能描述： */ void DisPlay() unsigned char i,j; for(i=0;i7;i+) P2=0xFF; for(j=0;j4;j+) OutData(unsigned char *)&Disbuftempi)3-j); R_CLK=1;R_CLK=0;P2=CSRowi; BEEP=1; Delay(250); P2=0xff;/* * 函数名： SetDis * 功能描述：设置显示内容菜单 */ void SetDis() if(distime=1)/时分显示，秒针闪动 if(hour/10)=0) Dis0=14;else Dis0=hour/10; Dis1=hour%10; Dis3=minute/10; Dis4=minute%10; if(second%10)%2) Dis2=14; else Dis2=10; else if(disdate=1)/月、日显示 Dis0=month/10; Dis1=month%10; Dis3=day/10; Dis4=day%10; Dis2=20; else if(disyear=1)/年显示 Dis0=2; Dis1=0; Dis2=year/10; Dis3=year%10; Dis4=17; else if(distweek=1)/星期显示 Dis0=18; Dis1=19; Dis2=14; Dis3=14; Dis4=week%10; else if(diswendu=1)/显示温度 if(fg=0) Dis0=20;elseDis0=sdata/10; Dis1=sdata%10; Dis2=21; Dis3=xiaoshu1; Dis4=22; else if(settime=1)/设定时间显示、秒不闪动 if(hour/10)=0) Dis0=14;else Dis0=hour/10; Dis1=hour%10; Dis3=minute/10; Dis4=minute%10; Dis2=10; else if(setalarm=1)/设定闹钟时分 if(alarm_hh/10)=0) Dis0=14;else Dis0=alarm_hh/10; Dis1=alarm_hh%10; Dis3=alarm_ss/10; Dis4=alarm_ss%10; Dis2=10; else if(setdate=1)/月、日显示 Dis0=month/10; Dis1=month%10; Dis3=day/10; Dis4=day%10; Dis2=20; else if(setyear=1)/年显示 Dis0=2; Dis1=0; Dis2=year/10; Dis3=year%10; Dis4=17; else if(setweek=1)/星期显示 Dis0=18; Dis1=19; Dis2=14; Dis3=14; Dis4=week%10; /* * 函数名： DisProcess * 功能描述：装载显示数据 */ void DisProcess() unsigned char i,j; for(i=0;i5;i+) for(j=0;j7;j+) DisTempij=fontDisij; for(i=0;i7;i+) Disbuf0=DisTemp4i; Disbuf1=DisTemp3i; Disbuf2=DisTemp2i; Disbuf3=DisTemp1i; Disbuf4=DisTemp0i; Disbuftempi=Disbuf024|Disbuf118|Disbuf212|Disbuf36|Disbuf4; /* * 函数名： KeyCheck * 功能描述：