功能介绍：
0.本系统采用STC89C52作为单片机
1.LCD1602液晶实时显示温度/PID参数/设定的温度上下限/PWM输出/通信地址
2.当温度超过上下限阈值时，蜂鸣器报警
3.采用增量式PID算法控制当前温度。
4.定时向串口发送当前温度
5.可通过串口发送命令更改配置参数
6.采用DC002作为电源接口可直接输入5V给整个系统供电
原理图：
PCB ：
主程序：
#include <reg52.h> //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器的定义#include <stdio.h>#include "delay.h"#include "pid.h"#include "tlc0832.h"#include "oled_iic.h"#include "math.h"/************************* 宏定义 *************************/#define ON 0#define OFF 1#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#define FRAME_HEADER 0x1a#define FRAME_FUCTION_TEMP 0x00 //功能位，温度#define FRAME_FUCTION_TARGET 0x01 //功能位，目标温度#define FRAME_FUCTION_KP 0x02 //功能位，Kp#define FRAME_FUCTION_KI 0x03 //功能位，Ki#define FRAME_FUCTION_KD 0x04 //功能位，Kd#define FRAME_FUCTION_TEMP_MIN 0x05 //功能位，温度下限#define FRAME_FUCTION_TEMP_MAX 0x06 //功能位，温度上限#define FRAME_FUCTION_ADDR 0x07 //功能位，通信地址#define FRAME_END0x3f/************************* 引脚定义 *************************/sbit BUZZER= P3^7;sbit L9110_A= P1^3;sbit L9110_B= P1^4;/************************* 变量定义 *************************/PID_Calibration_Def xdata PID_Calibration; //PID结构体PID_State_Def xdata PID_State; //PID结构体float temperature; //实际温度float f_tempVolt = 0; //温度对应电压float current = 0;float Rt = 0;int xdata tempMin = 20; //温度下限int xdata tempMax = 50; //温度上限char xdata dis0[16]; //定义显示区域临时存储数组bit refreshFlag = 1; //刷新标志unsigned char setIndex = 0;unsigned char PWMCnt = 0;unsigned char address = 0; //通信地址/************************* 函数声明 *************************/void Timer0_Init(void); //函数声明void KeyProcess(void); //按键处理void Set_PID_Parameter(void); //PID参数初始化void UART_Init(void); //串口初始化void UART_SendByte(unsigned char dat); //串口发送单字节数据// void UART_SendStr(unsigned char *s, unsigned char length); //发送定长度字符串void SendData(unsigned char address, float temperature); //串口发送数据void main(void){/************************* 初始化 *************************/Timer0_Init();OLED_Init();OLED_Clear();UART_Init();Set_PID_Parameter();/************************* 主循环 *************************/while (1){ET0 = 0;f_tempVolt = 5 * (float)ReadADC(AIN0_GND) / 255; //读取电压ET0 = 1;current = (5 - f_tempVolt) / Rp; //计算电流值Rt = f_tempVolt / current; //计算电阻值temperature = ((Bx * T25) / (T25 * (log(Rt) - log(ntcR25)) + Bx)) - Ka;PID_State.actual = temperature; //当前温度// PIDPID_State = PID_Increament(PID_Calibration, PID_State);if (PWMCnt <= PID_State.output) //占空比调节{L9110_A = 1;L9110_B = 0;}else{L9110_A = 0;L9110_B = 1;}if (refreshFlag == 1) //定时刷新屏幕{refreshFlag = 0;sprintf(dis0,"T:%5.1f", temperature); OLED_ShowString(8, 0, dis0, FONT_1608); //显示温度OLED_ShowWord(8*8, 0, 0); //显示摄氏度SendData(address, temperature*10);sprintf(dis0," S:%3d", (int)PID_State.target); //显示目标温度OLED_ShowString(10*8, 0, dis0, FONT_1608);sprintf(dis0," MIN:%3d MAX:%3d", tempMin, tempMax); //显示温度下限，温度上限OLED_ShowString(0, 2, dis0, FONT_1608);sprintf(dis0," P:%3d I:%3d %3d", (int)PID_Calibration.kp, (int)PID_Calibration.ki, (int)PID_State.output); //显示Kd,Ki,PWM输出OLED_ShowString(0, 4, dis0, FONT_1608);sprintf(dis0," D:%3d ADDR:%2d", (int)PID_Calibration.kd, (int)address); //显示Kd，通信地址OLED_ShowString(0, 6, dis0, FONT_1608);//显示设定位置if (setIndex == 0){OLED_ShowChar(10*8, 0, ' ', FONT_1608);OLED_ShowChar(0, 2, ' ', FONT_1608);OLED_ShowChar(8*8, 2, ' ', FONT_1608);OLED_ShowChar(0, 4, ' ', FONT_1608);OLED_ShowChar(6*8, 4, ' ', FONT_1608);OLED_ShowChar(0, 6, ' ', FONT_1608);OLED_ShowChar(6*8, 6, ' ', FONT_1608);}else if (setIndex == 1){OLED_ShowChar(0, 0, ' ', FONT_1608);OLED_ShowChar(10*8, 0, '>', FONT_1608);}else if (setIndex == 2){OLED_ShowChar(10*8, 0, ' ', FONT_1608);OLED_ShowChar(0, 2, '>', FONT_1608);}else if (setIndex == 3){OLED_ShowChar(0, 2, ' ', FONT_1608);OLED_ShowChar(8*8, 2, '>', FONT_1608);}else if (setIndex == 4){OLED_ShowChar(8*8, 2, ' ', FONT_1608);OLED_ShowChar(0, 4, '>', FONT_1608);}else if (setIndex == 5){OLED_ShowChar(0, 4, ' ', FONT_1608);OLED_ShowChar(6*8, 4, '>', FONT_1608);}else if (setIndex == 6){OLED_ShowChar(6*8, 4, ' ', FONT_1608);OLED_ShowChar(0, 6, '>', FONT_1608);}else if (setIndex == 7){OLED_ShowChar(0, 6, ' ', FONT_1608);OLED_ShowChar(6*8, 6, '>', FONT_1608);}if (temperature < tempMin || temperature > tempMax) //高于温度上限，或低于温度下限{BUZZER = 0; //打开蜂鸣器 }else{BUZZER = 1; //关闭蜂鸣器}}KeyProcess();DelayMs(100);}}void Set_PID_Parameter(void){PID_Calibration.kp = 100;PID_Calibration.ki = 20;PID_Calibration.kd = 10;PID_State.actual = 0;PID_State.target = 35;PID_State.integral = 0;PID_State.last_error = 0;PID_State.previous_error = 0;PID_State.output = 0;} void Timer0_Init(void){TMOD &= 0xF0;//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TL0 = 0x00;//设置定时初值TH0 = 0xEE;//设置定时初值 5msPT0 = 1; //设置高优先级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}void Timer0_isr(void) interrupt 1{static unsigned int numCount = 0;TL0 = 0x66;//设置定时初始值TH0 = 0xFC;//设置定时初始值 1msnumCount++;if (numCount > 200){numCount = 0;refreshFlag = 1;}if (PWMCnt < 100){PWMCnt++;}else{PWMCnt = 1; //一个周期结束} }void SendData(unsigned char address, float temperature){UART_SendByte(FRAME_HEADER); //发送帧头UART_SendByte(address); //发送地址UART_SendByte(FRAME_FUCTION_TEMP); //发送功能位，温度UART_SendByte(0x02); //发送数据长度位UART_SendByte((unsigned char)((((int)temperature)>>8) & 0x00ff)); //发送数据内容高字节UART_SendByte((unsigned char)(((int)temperature) & 0x00ff)); //发送数据内容低字节UART_SendByte(FRAME_END); //发送帧尾}/************************* 串口配置 *************************/void UART_Init(void){SCON = 0x50;TH2 = 0xFF;TL2 = 0xFD;RCAP2H = 0xFF; //(65536-(FOSC/32/BAUD)) BAUD = 9600 FOSC = 11059200RCAP2L = 0xDC;// RCAP2H = 0xFF; //(65536-(FOSC/32/BAUD)) BAUD = 115200 FOSC = 11059200//RCAP2L = 0xFD;/*****************/TCLK = 1;RCLK = 1;C_T2 = 0;EXEN2 = 0;/*****************/TR2 = 1;ES = 1; //打开串口中断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++//}//}/************************* 串口中断 *************************/void UART_Interrupt(void) interrupt 4 //串行中断服务程序{static unsigned char i = 0;static unsigned char firstBit = 0;static unsigned char R_buf[6];if (RI)//判断是接收中断产生{RI = 0; //标志位清零TR0 = 0;//SBUF = SBUF;if (SBUF == FRAME_HEADER) //检查到帧头{firstBit = 1; //接收标志成功i = 0;R_buf[1] = 0;R_buf[2] = 0;R_buf[3] = 0;R_buf[4] = 0;R_buf[5] = 0;}if (firstBit == 1){R_buf[i] = SBUF;i++;if (i == 6){i = 0;if (R_buf[0] == FRAME_HEADER && R_buf[5] == FRAME_END) //检测到帧头和帧尾{if (R_buf[1] == address) //地址对应{if (R_buf[2] == FRAME_FUCTION_TARGET && R_buf[3] == 0x01) //功能位和数据长度{if (R_buf[4] <= 100 && R_buf[4] >= 10){PID_State.target = R_buf[4];}}else if (R_buf[2] == FRAME_FUCTION_KP && R_buf[3] == 0x01){if (R_buf[4] <= 100){PID_Calibration.kp = R_buf[4];}}else if (R_buf[2] == FRAME_FUCTION_KI && R_buf[3] == 0x01){if (R_buf[4] <= 100){PID_Calibration.ki = R_buf[4];}}else if (R_buf[2] == FRAME_FUCTION_KD && R_buf[3] == 0x01){if (R_buf[4] <= 100){PID_Calibration.kd = R_buf[4];}}else if (R_buf[2] == FRAME_FUCTION_TEMP_MIN && R_buf[3] == 0x01){if (R_buf[4] < tempMax && R_buf[4] >= 0){tempMin = R_buf[4];}}else if (R_buf[2] == FRAME_FUCTION_TEMP_MAX && R_buf[3] == 0x01){if (R_buf[4] <= 100 && R_buf[4] > tempMin){tempMax = R_buf[4];}}else if (R_buf[2] == FRAME_FUCTION_ADDR && R_buf[3] == 0x01){if (R_buf[4] <= 16){address = R_buf[4];}}}}firstBit = 0;}}TR0 = 1;}if (TI)//判断是发送中断产生{TI = 0; //标志位清零}}
仿真演示视频：
/video/BV1Ne4y1S7Qo/
实物演示视频：
/video/BV1j8411W7ev/
