51单片机BH1750测试光照强度显示在LCD1602上

您好！您可以使用51单片机和BH1750光照强度传感器来测试并将结果显示在LCD1602上。下面是一个简单的示例代码：

#include <reg51.h>
#include <intrins.h>

#define LCD1602_DATAPORT P0
sbit LCD1602_RS = P2^0;
sbit LCD1602_RW = P2^1;
sbit LCD1602_E = P2^2;

sbit BH1750_SCL = P3^6;
sbit BH1750_SDA = P3^7;

void delay_ms(unsigned int ms) {
    unsigned int i, j;
    for(i = 0; i < ms; i++) {
        for(j = 0; j < 112; j++);
    }
}

void LCD1602_WriteCommand(unsigned char cmd) {
    LCD1602_RS = 0;
    LCD1602_RW = 0;
    LCD1602_E = 0;
    LCD1602_DATAPORT = cmd;
    _nop_();
    _nop_();
    LCD1602_E = 1;
    _nop_();
    _nop_();
    LCD1602_E = 0;
    delay_ms(1);
}

void LCD1602_WriteData(unsigned char dat) {
    LCD1602_RS = 1;
    LCD1602_RW = 0;
    LCD1602_E = 0;
    LCD1602_DATAPORT = dat;
    _nop_();
    _nop_();
    LCD1602_E = 1;
    _nop_();
    _nop_();
    LCD1602_E = 0;
    delay_ms(1);
}

void BH1750_Start() {
    BH1750_SDA = 1;
    delay_ms(1);
    BH1750_SCL = 1;
    delay_ms(1);
    BH1750_SDA = 0;
    delay_ms(1);
    BH1750_SCL = 0;
    delay_ms(1);
}

void BH1750_Stop() {
    BH1750_SCL = 0;
    delay_ms(1);
    BH1750_SDA = 0;
    delay_ms(1);
    BH1750_SCL = 1;
    delay_ms(1);
    BH1750_SDA = 1;
    delay_ms(1);
}

bit BH1750_WaitAck() {
    unsigned char ucErrTime = 0;
    BH1750_SDA = 1;
    _nop_();
    BH1750_SCL = 1;
    _nop_();
    while (BH1750_SDA) {
        ucErrTime++;
        if (ucErrTime > 250) {
            BH1750_Stop();
            return 1;
        }
    }
    BH1750_SCL = 0;
    return 0;
}

void BH1750_SendByte(unsigned char txd) {
    unsigned char t;
    BH1750_SCL = 0;
    for(t = 0; t < 8; t++) {
        BH1750_SDA = (txd & 0x80) >> 7;
        txd <<= 1;
        BH1750_SCL = 1;
        _nop_();
        BH1750_SCL = 0;
        _nop_();
    }
}

unsigned int BH1750_ReadData() {
    unsigned int i, dat;
    BH1750_SDA = 1;
    dat = 0;
    for(i = 0; i < 16; i++) {
        BH1750_SCL = 0;
        _nop_();
        BH1750_SCL = 1;
        _nop_();
        dat <<= 1;
        if (BH1750_SDA) {
            dat++;
        }
    }
    return dat;
}

void LCD1602_Init() {
    delay_ms(20);
    LCD1602_WriteCommand(0x38);
    delay_ms(5);
    LCD1602_WriteCommand(0x38);
    delay_ms(5);
    LCD1602_WriteCommand(0x38);
    delay_ms(5);
    LCD1602_WriteCommand(0x38);
    delay_ms(5);
    LCD1602_WriteCommand(0x08);
    delay_ms(5);
    LCD1602_WriteCommand(0x01);
    delay_ms(5);
    LCD1602_WriteCommand(0x06);
    delay_ms(5);
    LCD1602_WriteCommand(0x0C);
    delay_ms(5);
}

void main() {
    unsigned int lux;
    unsigned char str[16];
    
    LCD1602_Init();
    
    while(1) {
        BH1750_Start();
        BH1750_SendByte(0x23);
        if (BH1750_WaitAck() == 1) {
            continue;
        }
        BH1750_Stop();
        
        delay_ms(180);
        
        BH1750_Start();
        BH1750_SendByte(0x23 | 0x01);
        if (BH1750_WaitAck() == 1) {
            continue;
        }
        lux = BH1750_ReadData();
        BH1750_Stop();
        
        sprintf(str, "Light: %d lx", lux);
        
        LCD1602_WriteCommand(0x80);
        for(int i = 0; i < 16; i++) {
            if (str[i] == '\0') {
                break;
            }
            LCD1602_WriteData(str[i]);
            delay_ms(1);
        }
        
        delay_ms(1000);
    }
}

请注意，该代码仅提供了基本的示例，您可能需要根据实际情况进行修改和适配。此外，确保您的开发环境已正确配置并连接了BH1750传感器和LCD1602显示屏。祝您成功完成项目！如果您还有其他问题，请随时提问。