警報裝置，溫度在1602上顯s示

ID:236125 · 發(fā)表于 2017-11-13 21:31

#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit rw = P3^6;
sbit RS = P3^5;
sbit ds = P2^2;
sbit LCDEN = P3^4;
beep=P2^3;
uchar code table[] = " test temp:";
int value;
void delayMs(uint a)  //延時
{
uint i, j;
for(i = a; i > 0; i--)
      for(j = 100; j > 0; j--);
}

void writeComm(uchar comm)
{
RS = 0;
P0 = comm;
delayMs(5);
LCDEN = 1;
delayMs(5);
LCDEN = 0;
}

void writeData(uchar dat)
{
   RS = 1;
   P0 = dat;
   delayMs(1);
   LCDEN = 1;
   delayMs(1);
   LCDEN = 0;

}

void init()
{
   rw = 0;
   writeComm(0x38);
   writeComm(0x0c);
   writeComm(0x06);
   writeComm(0x01);
}

void writeString(uchar * str, uchar length)
{
   uchar i;
   for(i = 0; i < length; i++)
   {
      writeData(str[i]);
   }
}

/**//*****************************DS18B20*******************************/

void dsInit()
{

   unsigned int i;
   ds = 0;
   i = 100;
   while(i>0)
   i--;
   ds = 1;
   i = 4;
   while(i>0)
   i--;
}

bit readBit()
{
unsigned int i;
bit b;
ds = 0;
i++;
ds = 1;
i++;
i++;
b = ds;
i = 8;
while(i>0)
i--;
return b;
}

unsigned char readByte()
{
   unsigned int i;
   unsigned char j, dat;
   dat = 0;
   for(i=0; i<8; i++)
   {
      j = readBit();

      dat = (j << 7) | (dat >> 1);
   }
return dat;
}

void writeByte(unsigned char dat)
{
int i,j;
for(j=0;j<8;j++)
{
   ds=0;
   i++;
   ds=dat&0x01;
   i=6;
   while(i--);
   ds=1;
   dat>>=1;
   }
}

void sendChangeCmd()//溫度轉(zhuǎn)化命令
{
dsInit();
delayMs(1);
writeByte(0xcc);
writeByte(0x44);
}

void sendReadCmd() //讀取溫度
{
dsInit();
delayMs(1);
writeByte(0xcc);
writeByte(0xbe);
}

int getTmpValue()
{

unsigned int tmpvalue;
float t;
unsigned char low, high;
sendReadCmd();
low = readByte();
high = readByte();
tmpvalue = high;
tmpvalue <<= 8;
tmpvalue |= low;
value = tmpvalue;

t = value * 0.0625;

value = t * 100 + (value > 0 ? 0.5 : -0.5); //大于0加0.5, 小于0減0.5
return value;
}

void display()
{
unsigned char count;
unsigned char datas[] = {0, 0, 0, 0, 0};
unsigned int tmp =getTmpValue();
datas[0] = tmp / 10000;
datas[1] = tmp % 10000 / 1000;
datas[2] = tmp % 1000 / 100;
datas[3] = tmp % 100 / 10;
datas[4] = tmp % 10;

writeComm(0xc0+3);
if(tmp< 0)
{
      writeString("- ", 1);
}
else
{
   writeString("+ ", 1);
}
for(count = 1; count < 5; count++)
{
      writeData('0'+datas[count]);
      if(count == 2)
      {
         writeData('.');
      }
}

}
/**//*****************************DS18B20*******************************/

void main()
{

init();
writeComm(0x80);
writeString(table,11);
while(1)
{
      sendChangeCmd();//發(fā)送溫度轉(zhuǎn)化命令
      delayMs(750); //溫度轉(zhuǎn)換時間需要750ms以上
      writeComm(0xc0);
      display();
   if（value>2000)
   {
   beep=0;
      P1=0x00;
   }
   else
   {
      beep=1;
         P1=0xff;
}
}

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警報裝置，溫度在1602上顯s示

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