功能介绍：
0.本系统采用STC89C52作为单片机
1.通过传感器监测水位，当水位低于水位下限时，接通加水水泵，直到水位达到水位上限，停止加水
2.水位低于水位下限时，声光报警
3.可按键手动加水，直到水位达到水位上限，停止加水
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> //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 "lcd1602.h"#include "delay.h"/************************* 宏定义 *************************/#define ON 0#define OFF 1/************************* 管脚定义 *************************/sbit KEY_ADD = P3^4; sbit RELAY_WATER = P1^3; //加水控制继电器sbit BUZZER = P2^2; //蜂鸣器sbit LED = P3^5; //指示灯sbit WATER_UPPER_LIMIT_FLAG = P3^7; //水位上限触发sbit WATER_LOWER_LIMIT_FLAG = P3^6; //水位下限触发/************************* 变量定义 *************************/unsigned char dispFlag = 0; //更新显示标志/************************* 函数声明 *************************/void Timer0_Init(void); //定时器初始化void CheckKey(void); //按键检测void main(void){RELAY_WATER = OFF;BUZZER = OFF;Timer0_Init();LCD_Init(); //初始化液晶DelayMs(200); //延时有助于稳定LCD_Clear(); //清屏LCD_DispStr(0, 0, " Water Level ");while (1) //主循环{if (dispFlag == 1) //显示标志{dispFlag = 0;if ((WATER_LOWER_LIMIT_FLAG == 0) && (WATER_UPPER_LIMIT_FLAG == 0)) //低于下限{RELAY_WATER = ON; //打开加水继电器BUZZER = ON;LED = ON;LCD_DispStr(0, 1, "Low! ");}else if ((WATER_UPPER_LIMIT_FLAG == 1) && (WATER_LOWER_LIMIT_FLAG == 1)) //高于上限{RELAY_WATER = OFF; //关闭加水继电器BUZZER = OFF;LED = OFF;LCD_DispStr(0, 1, "High!");}else if ((WATER_UPPER_LIMIT_FLAG == 1) && (WATER_LOWER_LIMIT_FLAG == 0)) //错误{RELAY_WATER = OFF; //关闭加水继电器BUZZER = ~BUZZER; //错误时蜂鸣器间隔响LED = ~LED;LCD_DispStr(0, 1, "Erorr!");}else{BUZZER = OFF;LED = OFF;LCD_DispStr(0, 1, "Normal");}}CheckKey(); //按键检测}}void CheckKey(void){static unsigned char rekey = 0;if (KEY_ADD == 0) //检测到按键按下{DelayMs(10); //小抖动if (rekey == 0){if (KEY_ADD == 0) //加水键按下{rekey = 1;RELAY_WATER = ON; //加水}}}else{rekey = 0; //防止重复检测到按键}}/*------------------------------------------------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 - 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}/*------------------------------------------------定时器中断子程序------------------------------------------------*/void Timer0_Interrupt(void) interrupt 1{static unsigned char time20ms = 0;TH0 = (65536 - 18432) / 256; //重新赋值 20msTL0 = (65536 - 18432) % 256;time20ms++;if (time20ms > 25) //500ms{time20ms = 0;dispFlag = 1;}}
仿真演示视频：
/video/BV1nG411E7tq/
实物演示视频：
/video/BV1Zt4y1F7xL/
