基于51单片机的温度检测上传电脑（RS232/USB）proteus仿真原理图PCB
#include ""
#define T25 (273.15+25) //T25
#define Bx (4050.0) //B值
#define Ka (273.15) //绝对零度
#define Rp (10000.0) //ntc串联电阻
#define ntcR25 (10000.0) //25度时电阻
/*******************变量定义*********************/
float f_tempVolt = 0; //温度对应电压
float f_temp = 0.0; //温度值
bit dispFlag = 1; //显示刷新标志
bit sendFlag = 1; //串口发送标志
char dis[25];
/********************************************************
函数名称:void mian()
函数作用:主函数
参数说明:
********************************************************/
void main()
{
Timer0_Init(); //初始化定时器0
UART_Init(); //初始化串口
LCD_Init(); //初始化液晶
DelayMs(200); //延时有助于稳定
LCD_DispStr(4, 0, "Welcome!");
DelayS(1);
LCD_Clear(); //清屏
while (1) //死循环
{
if (dispFlag == 1)
{
dispFlag = 0;
DispNormal();
}
if (sendFlag == 1)
{
sendFlag = 0;
SendData();
}
}
}
void DispNormal(void)
{
float current = 0;
float Rt = 0;
LCD_DispStr(0, 0, "The Temperature ");
f_tempVolt = 5 * (float)ReadADC(AIN0_GND) / 255; //读取电压
current = (5 - f_tempVolt) / Rp; //计算电流值
Rt = f_tempVolt / current; //计算电阻值
f_temp = ((Bx * T25) / (T25 * (log(Rt) - log(ntcR25)) + Bx)) - Ka;
sprintf(dis, "%5.1f", f_temp);
LCD_DispStr(4, 1, dis);
LCD_DispOneChar(9, 1, 0xdf);
LCD_DispOneChar(10, 1, 'C');
}
void SendData(void)
{
sprintf(dis, "The Temperature:%5.1f℃\r\n", f_temp);
UART_SendStr(dis, 25);
}
/*------------------------------------------------
定时器初始化子程序
------------------------------------------------*/
void Timer0_Init(void)
{
TMOD |= 0x01; //使用模式1，16位定时器，使用"|"符号可以在使用多个定时器时不受影响
TH0 = (65536 - 9216) / 256; //重新赋值 10ms
TL0 = (65536 - 9216) % 256;
EA = 1; //总中断打开
ET0 = 1; //定时器中断打开
TR0 = 1; //定时器开关打开
}
/*------------------------------------------------
定时器中断子程序
------------------------------------------------*/
void Timer0_Interrupt(void) interrupt 1
{
static unsigned int time10ms = 0;
TH0 = (65536 - 9216) / 256; //重新赋值 10ms
TL0 = (65536 - 9216) % 256;
time10ms++;
if (time10ms % 50 == 0) //500ms刷新一次
{
dispFlag = 1; //显示标志
}
if (time10ms > 500) //5s发送一次
{
sendFlag = 1; //串口发送标志
time10ms = 0;
}
}
/************************* 串口配置 *************************/
void UART_Init(void)
{
SCON = 0x50;
TH2 = 0xFF;
TL2 = 0xFD;
RCAP2H = 0xFF; //(65536-(FOSC/32/BAUD)) BAUD = 115200 FOSC = 11059200
RCAP2L = 0xFD;
/*****************/
TCLK = 1;
RCLK = 1;
C_T2 = 0;
EXEN2 = 0;
/*****************/
TR2 = 1;
ES = 0; //关闭串口中断
EA = 1; //打开总中断
}
/************************* 串口发送字节 *************************/
void UART_SendByte(unsigned char dat) //串口发送单字节数据
{
unsigned char time_out;
time_out = 0;
SBUF = dat; //将数据放入SBUF中
while ((!TI) && (time_out < 100)) //检测是否发送出去
{
time_out++;
DelayUs10x(2);
} //未发送出去 进行短暂延时
TI = 0; //清除ti标志
}
/************************* 串口发送字符串 *************************/
void UART_SendStr(unsigned char *s, unsigned char length)
{
unsigned char num;
num = 0x00;
while (num < length) //发送长度对比
{
UART_SendByte(*s); //放松单字节数据
s++; //指针++
num++; //下一个++
}
}
//void UART_Interrupt(void) interrupt 4 //串行中断服务程序
//{
// if (RI)//判断是接收中断产生
// {
// RI = 0; //标志位清零
// }
//}