stm32f103c8t6的根据BH1750检测照度实现led灯随环境的变化led灯的亮度也随着变化的代码

以下是一个简单的示例代码，演示如何在STM32F103C8T6上使用BH1750传感器来控制LED灯的亮度：

#include "stm32f10x.h"
#include "bh1750.h" // BH1750库函数头文件

#define BH1750_ADDR 0x23 // BH1750传感器的I2C地址

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    // 配置LED引脚
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    // 配置I2C引脚
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
}

void I2C_Configuration(void)
{
    I2C_InitTypeDef I2C_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = 0x00;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = 100000;

    I2C_Init(I2C1, &I2C_InitStructure);
    I2C_Cmd(I2C1, ENABLE);
}

void BH1750_Init(void)
{
    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
        ;

    I2C_Send7bitAddress(I2C1, BH1750_ADDR << 1, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
        ;

    I2C_SendData(I2C1, 0x10); // 设置BH1750传感器的工作模式为连续高分辨率模式
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
        ;

    I2C_GenerateSTOP(I2C1, ENABLE);
}

uint16_t BH1750_ReadLight(void)
{
    uint16_t light;

    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
        ;

    I2C_Send7bitAddress(I2C1, BH1750_ADDR << 1, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
        ;

    I2C_SendData(I2C1, 0x00); // 发送读取指令
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
        ;

    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
        ;

    I2C_Send7bitAddress(I2C1, BH1750_ADDR << 1, I2C_Direction_Receiver);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
        ;

    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))
        ;
    light = (I2C_ReceiveData(I2C1) << 8);

    I2C_AcknowledgeConfig(I2C1, DISABLE);
    I2C_GenerateSTOP(I2C1, ENABLE);

    return light;
}

void TIM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_InitStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    TIM_InitStructure.TIM_Prescaler = 7199; // 10 kHz的计数频率
    TIM_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_InitStructure.TIM_Period = 999; // 周期为0-999
    TIM_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_InitStructure.TIM_RepetitionCounter = 0;
    TIM_TimeBaseInit(TIM3, &TIM_InitStructure);

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0; // 初始占空比为0%
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC3Init(TIM3, &TIM_OCInitStructure);
    TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

    TIM_Cmd(TIM3, ENABLE);
}

void Set_LED_Brightness(uint16_t brightness)
{
    TIM_SetCompare3(TIM3, brightness);
}

int main(void)
{
    GPIO_Configuration();
    I2C_Configuration();
    BH1750_Init();
    TIM_Configuration();

    while (1)
    {
        uint16_t light = BH1750_ReadLight();
        uint16_t brightness = light / 10; // 根据光照强度计算LED亮度

        Set_LED_Brightness(brightness);

        // 稍作延时
        for (volatile int i = 0; i < 100000; i++)
            ;
    }
}

这段代码通过BH1750传感器读取环境照度，并根据照度值计算LED灯的亮度。请确保你已经正确配置了STM32F103C8T6的引脚和时钟，并根据你的实际连接进行了适当的修改。另外，你可能需要下载并添加BH1750库函数文件到你的项目中。

希望这段代码能满足你的需求，如果有任何问题，请随时提问。