基于51单片机pwm调光护眼台灯智能检测光强光控灯设计proteus仿真原理图PCB

功能：
0.本系统采用STC89C52作为单片机
1.LCD1602液晶实时显示当前时间/模式/亮度等级
2.按’切换’键可切换四种不同的模式
a) 自动开关，自动调节亮度
b) 手动开关，自动调节亮度
c) 自动开关，手动调节亮度
d) 手动开关，手动调节亮度
3.长按’切换’键可打开或关闭LED小灯
4.按’增大’或’减小’键可调节LED亮度等级
5.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：

#define _MAIN_C
#include 
#include 
#include "main.h"
#include "delay.h"
#include "eeprom52.h"
#include "tlc0832.h"
#include "ds1302.h"
#include "lcd1602.h"
#include "date.h"

// 管脚声明
sbit IR_SCAN = P1^6;
sbit KEY_SUB = P3^6;
sbit KEY_ADD = P3^4;
sbit KEY_MODE = P3^5;
sbit KEY_SET = P3^3;
sbit LED_PWM = P2^1;
sbit BUZZER = P2^0;


extern unsigned char timeBufBcd[8];
extern unsigned char timeBufDec[8];

unsigned char dispRow0[] = "  /  /  ";
unsigned char dispRow1[] = "  :  :  ";
unsigned char g_setLocation = 0;
unsigned long highT0RH;
unsigned long highT0RL;
unsigned long lowT0RH;
unsigned long lowT0RL;
unsigned char g_PWMdutyCycle = 50;
unsigned char isNew;
unsigned long minuteBuf;
bit g_setTimeFlag = 0;
bit g_OffFlag = 0;
bit g_dispOn = 0;
bit g_getADData = 0;


void DispTime(); //显示时间
void Init_Timer0(); //定时器0初始化
void Init_Timer1(); //定时器1初始化
void KeyPress(); //按键处理
void SetTime(); //设定时间
void SetPWM(unsigned int freq, unsigned char dutyCycle); //PWM设定
void DispLED(); //显示模式和光照等级

CreatByte mode;

// 主函数
main()
{
    unsigned long PWMfreq = 100;
    unsigned long adData = 0;
    unsigned long adDataBuf = 0;
    static unsigned char getADDataCnt = 0;

    
    // 初始化
    Init_EEPROM();
    DS1302_Init();
    if (!isNew)
    {
        DS1302_ReadTime();
    }
    else
    {
        DS1302_WriteTime();
    }
    LCD_Init();
    LCD_CLear();

    SetPWM(PWMfreq, g_PWMdutyCycle);
    Init_Timer0();
    Init_Timer1();

    DispTime();
    DispLED();

    while (1)
    {
        SetPWM(PWMfreq, g_PWMdutyCycle); //设置PWM频率和占空比
        if (g_dispOn)
        {
            DispTime(); //显示时间
            DispLED(); //显示模式和灯光等级
            g_dispOn = 0;
        }

        if (g_setTimeFlag)
        {
            SetTime(); //设置时间
        }
        else
        { 
            DS1302_ReadTime(); //读取时间
        }
        
        if (g_isAutoOff) //自动开关模式
        {
            if (g_OffFlag == 1)
            {
                LED_PWM = 1;
                TR0 = 0; //关闭定时器0计数
            }
            else
            {
                TR0 = 1; //开启定时器0计数
            }
            
            if (IR_SCAN == 0) //有人时一直给最新的秒时间
            {
                minuteBuf = timeBufDec[6];
            }
            else //没人时，1分钟后关闭台灯
            {
                if (minuteBuf == timeBufDec[6] + 1)
                {
                    g_OffFlag = 1;
                }
            }
        }
        
        if (g_isAutoAjust == 1 && g_getADData == 1) //自动调整灯光亮度模式
        {
            adData = ReadADC(AIN0_GND);
            adData = 100 * adData / 255; //读取灯光亮度
            if (getADDataCnt < 5) //累加5次
            {
                adDataBuf = adDataBuf + adData;
                getADDataCnt++;
            }
            else //求平均
            {
                adDataBuf = adDataBuf / getADDataCnt;
                if (adDataBuf >= 95)
                {
                    adDataBuf = 95;
                }
                else if (adDataBuf <= 5)
                {
                    adDataBuf = 5;
                }
                g_PWMdutyCycle = adDataBuf;
                adDataBuf = 0;
                getADDataCnt = 0;
            }
            g_getADData = 0;
        }
        
        KeyPress(); //按键处理
    }
}

void DispTime()
{

    dispRow0[0] = timeBufDec[1] / 10 +'0'; //年
    dispRow0[1] = timeBufDec[1] % 10 +'0';
    dispRow0[3] = timeBufDec[2] / 10 +'0'; //月
    dispRow0[4] = timeBufDec[2] % 10 +'0';
    dispRow0[6] = timeBufDec[3] / 10 +'0'; //日
    dispRow0[7] = timeBufDec[3] % 10 +'0';
    dispRow1[0] = timeBufDec[4] / 10 +'0'; //时
    dispRow1[1] = timeBufDec[4] % 10 +'0';
    dispRow1[3] = timeBufDec[5] / 10 +'0'; //分
    dispRow1[4] = timeBufDec[5] % 10 +'0';
    dispRow1[6] = timeBufDec[6] / 10 +'0'; //秒
    dispRow1[7] = timeBufDec[6] % 10 +'0';

    LCD_WriteStr(0, 0, dispRow0); //显示日期
    LCD_WriteStr(0, 1, dispRow1); //显示时间

    switch (timeBufDec[7]) //显示星期
    {
        case 1: LCD_WriteStr(10, 0, " Sun."); break;
        case 2: LCD_WriteStr(10, 0, " Mon."); break;
        case 3: LCD_WriteStr(10, 0, " Tue."); break;
        case 4: LCD_WriteStr(10, 0, " Wed."); break;
        case 5: LCD_WriteStr(10, 0, "Thur."); break;
        case 6: LCD_WriteStr(10, 0, " Fri."); break;
        case 7: LCD_WriteStr(10, 0, " Sat."); break;
        default: LCD_WriteStr(10, 0, " Sun."); break;
    }
}

void SetTime()
{
    TR1 = 0;
    LCD_WriteCommand(0x0F, 0);
    // LCD_WriteCommand(0x0C, 0);
    switch (g_setLocation)
    {
        case 1: LCD_WriteCommand(0x80 + 1, 0); break;
        case 2: LCD_WriteCommand(0x80 + 4, 0); break;
        case 3: LCD_WriteCommand(0x80 + 7, 0); break;
        case 4: LCD_WriteCommand(0x80 + 0x40 + 1, 0); break;
        case 5: LCD_WriteCommand(0x80 + 0x40 + 4, 0); break;
        case 6: LCD_WriteCommand(0x80 + 0x40 + 7, 0); break;
        case 7: LCD_WriteCommand(0x80 + 14, 0); break;
        case 8: 
        {
            LCD_WriteCommand(0x0C, 0);
            DS1302_WriteTime();
            g_setLocation = 0;
            g_setTimeFlag = 0;
            break;
        }
        default: ;
    }
    TR1 = 1;
}

void DispLED()
{
    if (g_isAutoOff)
    {
        LCD_WriteChar(10, 1, 'A'); //自动开关模式
    }
    else
    {
        LCD_WriteChar(10, 1, 'M'); //手动开关模式
    }

    if (g_isAutoAjust)
    {
        LCD_WriteChar(12, 1, 'A'); //自动调节亮度模式
    }
    else
    {
        LCD_WriteChar(12, 1, 'M'); //手动调节亮度模式
    }

    LCD_WriteChar(14, 1, g_PWMdutyCycle / 5 / 10 + '0');
    LCD_WriteChar(15, 1, g_PWMdutyCycle / 5 % 10 + '0');
}

void SetPWM(unsigned int freq, unsigned char dutyCycle)
{
    unsigned long totalCnt;
    unsigned long highCnt;
    unsigned long lowCnt;

    totalCnt = 11059200 / freq / 12; // (1/freq) / (12/11059200);
    highCnt = totalCnt * dutyCycle / 100;
    lowCnt = totalCnt - highCnt;
    highCnt = 65536 - highCnt;
    lowCnt = 65536 - lowCnt;
    highT0RH = highCnt / 256;
    highT0RL = highCnt % 256;
    lowT0RH = lowCnt / 256;
    lowT0RL = lowCnt % 256;
}

void KeyPress()
{
    static unsigned int keyCnt;

    if (!KEY_SET) //设置键按下
    {
        DelayMs(10);
        if (!KEY_SET)
        {
            if (!g_setTimeFlag)
            {
                g_setTimeFlag = 1;
            }
            g_setLocation++;
            BUZZER = 0;
            DelayMs(10);
            BUZZER = 1;
        }
        while (!KEY_SET);
    }

    if (!KEY_ADD) //加键按下
    {
        DelayMs(180);
        if (!KEY_ADD)
        {
            if (!g_setTimeFlag)
            {
                if (g_isAutoAjust == 1)
                {
                    g_isAutoAjust = 0;
                }
                g_PWMdutyCycle = g_PWMdutyCycle + 5;
                if (g_PWMdutyCycle >= 95)
                {
                    g_PWMdutyCycle = 95;
                }
                Write_EEPROM();
            }
            else
            {
                switch (g_setLocation)
                {
                case 1:
                {
                    timeBufDec[1]++;
                    if (timeBufDec[1] >= 100)
                    {
                        timeBufDec[1] = 0;
                    }
                    break;
                }
                case 2:
                {
                    timeBufDec[2]++;
                    if (timeBufDec[2] >= 13)
                    {
                        timeBufDec[2] = 1;
                    }
                    break;
                }
                case 3:
                {
                    timeBufDec[3]++;
                    if (timeBufDec[3] >= YDay(timeBufDec[1], timeBufDec[2]) + 1)
                    {
                        timeBufDec[3] = 1;
                    }
                    break;
                }
                case 4:
                {
                    timeBufDec[4]++;
                    if (timeBufDec[4] >= 24)
                    {
                        timeBufDec[4] = 0;
                    }
                    break;
                }
                case 5:
                {
                    timeBufDec[5]++;
                    if (timeBufDec[5] >= 60)
                    {
                        timeBufDec[5] = 0;
                    }
                    break;
                }
                case 6:
                {
                    timeBufDec[6]++;
                    if (timeBufDec[6] >= 60)
                    {
                        timeBufDec[6] = 0;
                    }
                    break;
                }
                case 7:
                {
                    timeBufDec[7]++;
                    if (timeBufDec[7] > 7)
                    {
                        timeBufDec[7] = 1;
                    }
                    break;
                }
                default:;
                }
            }
            BUZZER = 0;
            DelayMs(10);
            BUZZER = 1;
        }
        //while (!KEY_ADD);
    }

    if (!KEY_SUB) //减键按下
    {
        DelayMs(180);
        if (!KEY_SUB)
        {
            if (!g_setTimeFlag)
            {
                if (g_isAutoAjust == 1)
                {
                    g_isAutoAjust = 0;
                }
                g_PWMdutyCycle = g_PWMdutyCycle - 5;
                if (g_PWMdutyCycle <= 5)
                {
                    g_PWMdutyCycle = 5;
                }
                Write_EEPROM();
            }
            else
            {
                switch (g_setLocation)
                {
                case 1:
                {
                    if (timeBufDec[1] == 0)
                    {
                        timeBufDec[1] = 100;
                    }
                    timeBufDec[1]--;
                    break;
                }
                case 2:
                {
                    timeBufDec[2]--;
                    if (timeBufDec[2] < 1)
                    {
                        timeBufDec[2] = 12;
                    }
                    break;
                }
                case 3:
                {
                    timeBufDec[3]--;
                    if (timeBufDec[3] < 1)
                    {
                        timeBufDec[3] = YDay(timeBufDec[1], timeBufDec[2]);
                    }
                    break;
                }
                case 4:
                {
                    if (timeBufDec[4] == 0)
                    {
                        timeBufDec[4] = 24;
                    }
                    timeBufDec[4]--;
                    break;
                }
                case 5:
                {
                    if (timeBufDec[5] == 0)
                    {
                        timeBufDec[5] = 60;
                    }
                    timeBufDec[5]--;
                    break;
                }
                case 6:
                {

                    if (timeBufDec[6] == 0)
                    {
                        timeBufDec[6] = 60;
                    }
                    timeBufDec[6]--;
                    break;
                }
                case 7:
                {
                    timeBufDec[7]--;
                    if (timeBufDec[7] < 1)
                    {
                        timeBufDec[7] = 7;
                    }
                    break;
                }
                default:;
                }
            }
            BUZZER = 0;
            DelayMs(10);
            BUZZER = 1;
        }
        //while (!KEY_SUB);
    }
    
    if (!KEY_MODE) //模式键按下
    {
        DelayMs(20);
        while (!KEY_MODE)
        {
            DelayMs(20);
            keyCnt++;
            if (keyCnt >= 50)
            {
                break;
            }
        }
        if (keyCnt >= 50) 
        {
            if (TR0 == 1) // 长按关灯
            {
                g_isAutoOff = 0;
                LED_PWM = 1;
                TR0 = 0;
            }
            else //长按开灯
            {
                g_isAutoOff = 0;
                LED_PWM = 0;
                TR0 = 1;
            }
        }
        else
        {
            if (g_setTimeFlag)
            {
                DS1302_WriteTime();
                g_setLocation = 0;
                g_setTimeFlag = 0;
            }
            else
            {
                g_mode++;
                g_mode &= 0x03; //满4清零
                Write_EEPROM();
            }
            LCD_WriteCommand(0x0C, 0);
            BUZZER = 0;
            DelayMs(10);
            BUZZER = 1;
        }
        keyCnt = 0;
        while (!KEY_MODE);
    }
}

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仿真演示视频：
https://www.bilibili.com/video/BV1ad4y1M75Y/

实物演示视频：

https://www.bilibili.com/video/BV1LW4y1v774/