用HC-SR501检测人接近，控制L9110风扇模块启动，用DHT11检测环境温度，调整风扇转速，人离开后关闭风扇，STM32F103ZET6生成代码

以下是使用HC-SR501、L9110和DHT11进行人体接近检测和风扇调速的STM32F103ZET6代码：

#include "dht11.h"
#include "delay.h"
#include "stm32f10x.h"

#define FAN_CONTROL_PIN GPIO_Pin_8
#define FAN_CONTROL_PORT GPIOB

#define MOTION_DETECTION_PIN GPIO_Pin_0
#define MOTION_DETECTION_PORT GPIOB

uint16_t DHT11_Temperature = 0;
uint16_t DHT11_Humidity = 0;
uint16_t fan_speed = 0;

void init_GPIO(void);
void init_TIM1(void);
void init_USART1(void);
void delay_ms(uint16_t ms);

int main(void)
{
    init_GPIO();
    init_TIM1();
    init_USART1();
    DHT11_Init();

    while (1)
    {
        uint8_t motion_detected = GPIO_ReadInputDataBit(MOTION_DETECTION_PORT, MOTION_DETECTION_PIN);
        if (motion_detected)
        {
            fan_speed = 1000;
            TIM_SetCompare1(TIM1, fan_speed);
            delay_ms(1000);
            DHT11_Read_Data(&DHT11_Temperature, &DHT11_Humidity);

            if (DHT11_Temperature > 280)
            {
                fan_speed = 2000;
                TIM_SetCompare1(TIM1, fan_speed);
            }
            else if (DHT11_Temperature > 260)
            {
                fan_speed = 1500;
                TIM_SetCompare1(TIM1, fan_speed);
            }
            else if (DHT11_Temperature > 240)
            {
                fan_speed = 1000;
                TIM_SetCompare1(TIM1, fan_speed);
            }
            else
            {
                fan_speed = 0;
                TIM_SetCompare1(TIM1, fan_speed);
            }
        }
        else
        {
            fan_speed = 0;
            TIM_SetCompare1(TIM1, fan_speed);
        }
    }
}

void init_GPIO(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    GPIO_InitStructure.GPIO_Pin = FAN_CONTROL_PIN; 
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
    GPIO_Init(FAN_CONTROL_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = MOTION_DETECTION_PIN; 
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; 
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
    GPIO_Init(MOTION_DETECTION_PORT, &GPIO_InitStructure);
}

void init_TIM1(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = 40000 - 1; 
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1; 
    TIM_TimeBaseStructure.TIM_ClockDivision = 0; 
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; 
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 
    TIM_OCInitStructure.TIM_Pulse = 0; 
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);

    TIM_Cmd(TIM1, ENABLE);
}

void delay_ms(uint16_t ms)
{
    while (ms--)
    {
        delay_us(1000);
    }
}

void USART1_IRQHandler(void)
{
    if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
    {
        uint8_t data = USART_ReceiveData(USART1);
        USART_SendData(USART1, data);
    }
}

需要注意的是，此代码中使用了DHT11库和延时库，需要自行下载并添加到项目中。此外，需要在STM32CubeMX中配置USART1串口和GPIOB的PB6和PB7引脚作为串口通信使用。