基于51单片机的智能护眼台灯设计proteus仿真原理图PCB

功能介绍：
0.本系统采用STC89C52作为单片机
1.LCD1602液晶实时显示当前时间/环境光强/工作模式
2.当检测到人体距离灯光太近时，蜂鸣器报警提醒
3.当使用时间超过设定阈值时，蜂鸣器报警提醒
4.可通过按键更改当前时间/工作模式/灯光亮度

原理图：

PCB：

主程序：

#define __MAIN_C
#include <reg52.h>
#include "main.h"

//变量定义
bit dispFlag = 1;
bit setFlag = 0;
bit alarmFlag = 0;
unsigned char alarmTimeCnt = 0;
unsigned char setIndex = 0;
unsigned char timeLimit[2] = {0, 1};
int lightValue;
char dispMode = 0;
bit autoFlag = 0;
bit lampASwitch;
unsigned char lampAPWM = 2;
unsigned int time500us = 0;
unsigned char second = 0;
unsigned int minute = 0;

void main()
{
    //初始化
    LCD_Init();
    DS1302_Init();

    Timer0_Init();
    
    DelayMs(20);
    //开机显示
    LCD_DispStr(0, 0, "    Welcome!    ");
    DelayS(1);
    LCD_Clear();
    DS1302_ReadTime();
    DispNormal(setIndex);
    
    lampASwitch = ON;

    while(1)
    {
        // LCD1602液晶显示
        if (dispFlag == 1)
        {
            dispFlag = 0;
            if (lampASwitch == ON) //灯光打开
            {
                LampCtr(); //灯光控制
            }

            if (alarmFlag == 1) //响铃1s
            {
                BUZZER = ON; //蜂鸣器报警
                alarmTimeCnt++;
                if (alarmTimeCnt >= 4)
                {
                    alarmTimeCnt = 0;
                    alarmFlag = 0;
                }
            }
            else
            {
                BUZZER = OFF; 
            }

            if (setFlag == 0) //非设置状态
            {
                DS1302_ReadTime();
                if (dispMode == DISP_NORMAL)
                {
                    DispNormal(setIndex);
                }
                else if (dispMode == SET_TIME_LIMIT)
                {
                    DispSetLimit(setIndex);
                }
            }
        }

        if (lampASwitch == ON) //灯光打开状态
        {
            if (minute >= 60 * timeLimit[0] + timeLimit[1]) //时间到设定阈值提醒一次
            {
                minute = 0;
                alarmFlag = 1;
            }

            if (IRFLAG == 0) //距离太近提醒一次
            {
                alarmFlag = 1;
            }
        }
        else
        {
            second = 0;
            minute = 0;
            alarmFlag = 0;
            BUZZER = OFF;
        }

        KeyProcess(); //按键检测和处理
    }
}

void LampCtr(void)
{
    lightValue = 99 - 99 * ReadADC1(AIN0_GND) / 255; //读取当前光照强度
    if (autoFlag)
    {
        if (lightValue <= 30)
        {
            lampAPWM = 4;
        }
        else if (lightValue > 30 && lightValue <= 60)
        {
            lampAPWM = 3;
        }
        else
        {
            lampAPWM = 2;
        }
    }
}

void Timer0_Init(void)
{
    TMOD &= 0xF0;
    TMOD |= 0x01;
    TL0 = 0x33;		//设置定时初值
	TH0 = 0xFE;		//设置定时初值 500us
    TR0 = 1; //启动T0计时
    ET0 = 1; //打开T0中断
    EA = 1;  //打开总中断
}

void Timer0_Intterupt(void) interrupt 1
{
    static int cnt = 0;
    static unsigned char ACount = 0;
    static unsigned int time500us = 0;

    TL0 = 0x33;		//设置定时初值
	TH0 = 0xFE;		//设置定时初值 500us

    cnt++;
    if (cnt >= 500) //250ms刷新一次状态
    {
        cnt = 0;
        dispFlag = 1;
        if (setFlag == 1)
        {
            LCD_WriteCommand(0x0F, 0);
            LCD_WriteCommand(0x0F, 0);
        }
        else
        {
            LCD_WriteCommand(0x0C, 0);
            LCD_WriteCommand(0x0C, 0);
        }
    }
    
    if (lampASwitch == ON) //灯光PWM控制
    {
        ACount++;
        if (ACount <= lampAPWM) //占空比调节
        {
            LAMPA = ON;
        }
        else if ((ACount > lampAPWM) && (ACount <= 4))
        {
            LAMPA = OFF;
        }
        else
        {
            ACount = 0;
        }
    }
    else
    {
        LAMPA = OFF;
    }   

    if (lampASwitch == ON)
    {
        //灯开启后计时
        time500us++;
        if (time500us >= 2000)
        {
            time500us = 0;
            second++;
            if (second >= 60)
            {
                second = 0;
                minute++;
            }
        }
    }
}

仿真演示视频：
https://www.bilibili.com/video/BV1Yg411d7ym/

实物演示视频：
https://www.bilibili.com/video/BV1b34y1E7Fz/