功能：
0.本项目采用STC89C52作为单片机系统的控制MCU
1.WIFI实时上传当前水位状态
2.通过液位传感器检测液位，检测到最低液位和最高液位时，超过设定阈值将声光报警
3.通过状态指示灯显示当前液位情况，三种颜色，红色代表低于下限，黄色代表高于上限，绿色代表正常
4.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"
#include 
#include 
#include "delay.h"sbit LOW_WATER_LEVEL  = P1^1; //水位下限
sbit HIGH_WATER_LEVEL = P1^0; //水位上限sbit LED_NORMAL = P3^5;
sbit LED_LOW    = P3^3;
sbit LED_HIGH   = P3^4;sbit BUZZER = P2^2;unsigned char sendDataFlag = 0;
bit messageCnt = 0;void Timer0_Init(); //函数声明
void UART_Init();
void UART_SendByte(unsigned char dat);
void UART_SendStr(unsigned char *s, unsigned char length);void main()
{Timer0_Init(); //定时器0初始化UART_Init();DelayS(5);UART_SendStr("AT+CIPMUX=1\r\n", 13); //打开多连接DelayS(1);UART_SendStr("AT+CIPSERVER=1,8080\r\n", 21); //建立服务 端口号为8080DelayS(1);while (1) //主循环{if (sendDataFlag == 1) //发送数据标志{if (messageCnt == 0) //区分at命令还是数据内容{messageCnt = 1;UART_SendStr("AT+CIPSEND=0,8\r\n", 16); //发送32位数据}else{if ((HIGH_WATER_LEVEL == 1) && (LOW_WATER_LEVEL == 1)) //高低都有水{LED_LOW = 1;LED_HIGH = 0;LED_NORMAL = 1;BUZZER = 0;UART_SendStr("*High*  ", 8); //发送内容}else if ((HIGH_WATER_LEVEL == 0) && (LOW_WATER_LEVEL == 0)) //高低都没有水{LED_LOW = 0;LED_HIGH = 1;LED_NORMAL = 1;BUZZER = 0;UART_SendStr("*Low*  ", 8); //发送内容}else if ((HIGH_WATER_LEVEL == 0) && (LOW_WATER_LEVEL == 1)) //正常水位{LED_LOW = 1;LED_HIGH = 1;LED_NORMAL = 0;BUZZER = 1;UART_SendStr("*Normal*", 8); //发送内容}else{LED_LOW = 0;LED_HIGH = 0;LED_NORMAL = 0;BUZZER = ~BUZZER;UART_SendStr("*Error* ", 8); //发送内容}UART_SendStr("\r\n", 2);messageCnt = 0; //发送数据}sendDataFlag = 0; //清除发送数据标志}}
}void Timer0_Init()
{TMOD &= 0xF0;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 - 18432) / 256; //重新赋值 20msTL0 = (65536 - 18432) % 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
}void UART_Init()
{SCON = 0x50;TH2 = 0xFF;TL2 = 0xFD;RCAP2H = 0xFF;  //(65536-(FOSC/32/BAUD))   BAUD = 115200 FOSC = 11059200RCAP2L = 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
}void UART_SendByte(unsigned char dat) //串口发送单字节数据
{unsigned char time_out;time_out = 0x00;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
}void UART_SendStr(unsigned char *s, unsigned char length) //发送定长度字符串
{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 Timer0_Interrupt() interrupt 1
{static unsigned char times20ms = 0;TH0 = (65536 - 18432) / 256; //重新赋值 20msTL0 = (65536 - 18432) % 256;times20ms++;if (times20ms > 50) //定时到1s{sendDataFlag = 1; //发送数据变量times20ms = 0;}
}// 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
// 	}
// }

仿真演示视频：
https://www.bilibili.com/video/BV1Uv4y127q3/

实物演示视频：
https://www.bilibili.com/video/BV1Bd4y1t7un/