帮我写一个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
时间: 2024-04-15 07:26:51 浏览: 88
BH1750_51_STM32代码.rar_BH-F103_BH1750 stm32_bh1750 51_bh1750写到stm
以下是使用STM32F103C8T6单片机和BH1750光照传感器实现LED灯随环境变化的亮度调节的示例代码:
```c
#include "stm32f10x.h"
#include "i2c.h"
#define BH1750_ADDR 0x23
#define BH1750_CONTINUOUS_HIGH_RES_MODE 0x10
#define LED_PIN GPIO_Pin_13
#define LED_PORT GPIOC
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
GPIO_InitStructure.GPIO_Pin = LED_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(LED_PORT, &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)
{
uint8_t data;
I2C_StartTransmission(I2C1, BH1750_ADDR, I2C_Direction_Transmitter);
I2C_WriteData(I2C1, BH1750_CONTINUOUS_HIGH_RES_MODE);
I2C_StopTransmission(I2C1);
delay_ms(180);
I2C_StartTransmission(I2C1, BH1750_ADDR, I2C_Direction_Receiver);
data = I2C_ReadData(I2C1, I2C_Ack_Disable);
I2C_StopTransmission(I2C1);
}
uint16_t BH1750_ReadLightIntensity(void)
{
uint16_t intensity = 0;
uint8_t data[2];
I2C_StartTransmission(I2C1, BH1750_ADDR, I2C_Direction_Receiver);
data[0] = I2C_ReadData(I2C1, I2C_Ack_Enable);
data[1] = I2C_ReadData(I2C1, I2C_Ack_Disable);
I2C_StopTransmission(I2C1);
intensity = (data[0] << 8) | data[1];
return intensity;
}
void LED_SetBrightness(uint16_t intensity)
{
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = intensity;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
}
int main(void)
{
GPIO_Configuration();
I2C_Configuration();
BH1750_Init();
// 初始化定时器3
// ...
while (1)
{
uint16_t intensity = BH1750_ReadLightIntensity();
LED_SetBrightness(intensity);
// 延时一段时间
// ...
}
}
```
在上述示例代码中,我们使用了STM32的I2C1接口来与BH1750光照传感器进行通信。在`BH1750_Init`函数中,我们向BH1750发送配置命令,设置为连续高分辨率模式。然后在`BH1750_ReadLightIntensity`函数中,我们从传感器读取光照强度的值。
接下来,我们通过初始化定时器3来控制LED的亮度。在`LED_SetBrightness`函数中,我们使用PWM功能来调整LED的亮度,根据读取到的光照强度值设置PWM占空比。
在主循环中,我们不断读取光照强度值,并根据该值调整LED的亮度。你可以根据实际需求调整延时的时间。
请注意,以上只是一个简单的示例,实际应用中可能还需要进行其他配置和操作。具体的实现方式可能因你的需求和硬件设计而有所不同,请根据实际情况进行适当调整。同时,还需要确保正确配置I2C和定时器3的初始化和相关中断处理等。
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