毕业设计后记
G-one
posted @ 2010年6月19日 18:14
in program
, 8150 阅读
由于时间加之蛮多烦人的事，好久没上来了，懒了不少呢。毕业设计的网络设计没做成，时间太紧急了，而且这个做起来还是蛮复杂的，最后不得不在这个模型基础上做修改，改成了无线温度收集的小系统
电池供电的那个小模块 中间黑色的小东西就是温度传感器 DS18B20 ，单总线数据输出模式
Init_DS18B20(void)//初始化ds1820
{
DQ = 1; //DQ复位
delayus(8); //稍做延时
DQ = 0; //单片机将DQ拉低
delayus(90); //精确延时 大于 480us
DQ = 1; //拉高总线
delayus(8);
presence = DQ; //如果=0则初始化成功 =1则初始化失败
delayus(100);
DQ = 1;
return(presence); //返回信号，0=presence,1= no presence
}
ReadOneChar(void)//读一个字节
{
unsigned char i = 0;
unsigned char dat = 0;
for (i = 8; i > 0; i--)
{
DQ = 0; // 给脉冲信号
dat >>= 1;
DQ = 1; // 给脉冲信号
if(DQ)
dat |= 0x80;
delayus(4);
}
return (dat);
}
WriteOneChar(unsigned char dat)//写一个字节
{
unsigned char i = 0;
for (i = 8; i > 0; i--)
{
DQ = 0;
DQ = dat&0x01;
delayus(5);
DQ = 1;
dat>>=1;
}
}
Read_Temperature(void)//读取温度
{
Init_DS18B20();
if(presence!=1)
{
WriteOneChar(0xCC); // 跳过读序号列号的操作
WriteOneChar(0x44); // 启动温度转换
Init_DS18B20();
WriteOneChar(0xCC); //跳过读序号列号的操作
WriteOneChar(0xBE); //读取温度寄存器
NUM[0]= ReadOneChar(); //温度低8位
NUM[1] = ReadOneChar(); //温度高8位
}
}
给出 DS18B20的 读写代码，若是单总线上有多个传感器那么读取温度里的 就不能跳过读取序列号操作了，毕竟要区分开数据是那个传感器的嘛，这里要说明一下的是DS18B20 每一个出场的ID号都不会一样的
毕业设计也不多说了，只讲到这里。下一篇讲一讲我最近做的一个小项目
2011年3月11日 13:46
跟我当年的毕设有些类似,不过我那个没整网络,而是多加了语音报警模块,
传感器你这个有点忒老了,我当时用的sht的,温湿度一体的...
顺带还用洞洞板纯手工打造了开发版和仿真器.....
2011年4月08日 21:46
我这都得自己出资啊~~~ 尽量容易找到，尽量便宜，我们都没仿真器......
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