用HC-SR501检测人接近1s以上，控制L9110风扇模块启动同时启动DHT11检测环境温度，在OLED屏幕上实时显示温度，根据温度自动调整风扇转速，人离开后关闭风扇，STM32F103ZET6生成代码

以下是您需要的代码：

#include "stm32f10x.h"
#include "dht11.h"
#include "ssd1306.h"

#define FAN_PIN1 GPIO_Pin_0
#define FAN_PIN2 GPIO_Pin_1
#define FAN_PORT GPIOA
#define SENSOR_PIN GPIO_Pin_7
#define SENSOR_PORT GPIOB
#define MOTION_PIN GPIO_Pin_0
#define MOTION_PORT GPIOB

#define OLED_SCL_PIN GPIO_Pin_10
#define OLED_SCL_PORT GPIOB
#define OLED_SDA_PIN GPIO_Pin_11
#define OLED_SDA_PORT GPIOB

void GPIO_Configuration(void);
void Delay(__IO uint32_t nCount);
void TIM3_Configuration(void);
void USART_Configuration(void);
void USART_SendString(USART_TypeDef* USARTx, char* s);

int main(void)
{
    GPIO_Configuration();
    TIM3_Configuration();
    USART_Configuration();
    DHT11_Init(SENSOR_PORT, SENSOR_PIN);
    SSD1306_Init(OLED_SCL_PORT, OLED_SCL_PIN, OLED_SDA_PORT, OLED_SDA_PIN);
    SSD1306_Clear();

    while (1)
    {
        if (GPIO_ReadInputDataBit(MOTION_PORT, MOTION_PIN) == Bit_SET) // 有人接近
        {
            GPIO_SetBits(FAN_PORT, FAN_PIN1);
            GPIO_ResetBits(FAN_PORT, FAN_PIN2);

            float temperature = DHT11_Read_Temperature();
            char str[20];
            sprintf(str, "Temp: %.1f C", temperature);
            SSD1306_ShowString(0, 0, str, 1);
            Delay(1000000); // 等待1秒后再次检测

            temperature = DHT11_Read_Temperature();
            sprintf(str, "Temp: %.1f C", temperature);
            SSD1306_ShowString(0, 0, str, 1);

            if (temperature >= 30.0) // 温度高，风扇转速加快
            {
                TIM_SetCompare2(TIM3, 800);
            }
            else if (temperature >= 25.0) // 温度正常，风扇转速适中
            {
                TIM_SetCompare2(TIM3, 600);
            }
            else // 温度低，风扇转速较低
            {
                TIM_SetCompare2(TIM3, 400);
            }
        }
        else // 没有人接近
        {
            GPIO_ResetBits(FAN_PORT, FAN_PIN1);
            GPIO_ResetBits(FAN_PORT, FAN_PIN2);
            TIM_SetCompare2(TIM3, 0);
            SSD1306_Clear();
        }
    }
}

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);

    // 风扇控制引脚
    GPIO_InitStructure.GPIO_Pin = FAN_PIN1 | FAN_PIN2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(FAN_PORT, &GPIO_InitStructure);

    // 人体红外检测引脚
    GPIO_InitStructure.GPIO_Pin = MOTION_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(MOTION_PORT, &GPIO_InitStructure);

    // OLED屏幕控制引脚
    GPIO_InitStructure.GPIO_Pin = OLED_SCL_PIN | OLED_SDA_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(OLED_SCL_PORT, &GPIO_InitStructure);
    GPIO_Init(OLED_SDA_PORT, &GPIO_InitStructure);
}

void TIM3_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    TIM_TimeBaseStructure.TIM_Period = 999;
    TIM_TimeBaseStructure.TIM_Prescaler = 7199;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &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_OC2Init(TIM3, &TIM_OCInitStructure);

    TIM_Cmd(TIM3, ENABLE);
}

void USART_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStructure);

    USART_Cmd(USART1, ENABLE);
}

void USART_SendString(USART_TypeDef* USARTx, char* s)
{
    while (*s)
    {
        while (USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET);
        USART_SendData(USARTx, *s++);
    }
}

void Delay(__IO uint32_t nCount)
{
    while(nCount--)
    {
    }
}

注意事项：

1. 该代码使用了DHT11库和SSD1306库，请自行下载并导入。
2. 在本代码中，风扇控制使用了L9110芯片，因此需要将L9110的IN1接到PA0引脚，IN2接到PA1引脚。
3. OLED屏幕使用的是SSD1306驱动芯片，请根据您的OLED屏幕型号修改对应的引脚号。
4. 本代码使用了USART1串口，波特率为115200。如果您需要使用其他串口，请自行修改代码。
5. 本代码中的温度控制逻辑为简单的比较阈值，实际应用中可能需要更复杂的算法。