基于STM32F103C8T6单片机控制温湿度，光照强度，烟雾浓度，报警和风扇的开启代码

以下是基于STM32F103C8T6单片机控制温湿度、光照强度、烟雾浓度、报警和风扇的开启代码：

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

#define DHT11_PORT GPIOB
#define DHT11_PIN GPIO_Pin_5

#define MQ2_PORT GPIOB
#define MQ2_PIN GPIO_Pin_6

#define FAN_PORT GPIOB
#define FAN_PIN GPIO_Pin_7

#define LED_PORT GPIOB
#define LED_PIN GPIO_Pin_8

#define ADC1_DR_Address ((uint32_t)0x4001244C)

int16_t temperature = 0;
int16_t humidity = 0;
uint16_t lightIntensity = 0;
uint16_t smokeDensity = 0;

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    // DHT11
    GPIO_InitStructure.GPIO_Pin = DHT11_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
    GPIO_Init(DHT11_PORT, &GPIO_InitStructure);

    // MQ2
    GPIO_InitStructure.GPIO_Pin = MQ2_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(MQ2_PORT, &GPIO_InitStructure);

    // Fan
    GPIO_InitStructure.GPIO_Pin = FAN_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(FAN_PORT, &GPIO_InitStructure);

    // LED
    GPIO_InitStructure.GPIO_Pin = LED_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(LED_PORT, &GPIO_InitStructure);
}

void ADC_Configuration(void)
{
    ADC_InitTypeDef ADC_InitStructure;
    DMA_InitTypeDef DMA_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    DMA_DeInit(DMA1_Channel1);
    DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&lightIntensity;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = 1;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA1_Channel1, &DMA_InitStructure);
    DMA_Cmd(DMA1_Channel1, ENABLE);

    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 1, ADC_SampleTime_55Cycles5);
    ADC_DMACmd(ADC1, ENABLE);
    ADC_Cmd(ADC1, ENABLE);
    ADC_ResetCalibration(ADC1);
    while (ADC_GetResetCalibrationStatus(ADC1))
        ;
    ADC_StartCalibration(ADC1);
    while (ADC_GetCalibrationStatus(ADC1))
        ;
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

void Fan_On(void)
{
    GPIO_SetBits(FAN_PORT, FAN_PIN);
}

void Fan_Off(void)
{
    GPIO_ResetBits(FAN_PORT, FAN_PIN);
}

void LED_On(void)
{
    GPIO_SetBits(LED_PORT, LED_PIN);
}

void LED_Off(void)
{
    GPIO_ResetBits(LED_PORT, LED_PIN);
}

void Alarm_On(void)
{
    LED_On();
    Fan_On();
}

void Alarm_Off(void)
{
    LED_Off();
    Fan_Off();
}

void Read_DHT11(void)
{
    uint8_t buffer[5] = {0};

    DHT11_Start();
    if (DHT11_Check_Response() == DHT11_OK)
    {
        buffer[0] = DHT11_Read_Byte();
        buffer[1] = DHT11_Read_Byte();
        buffer[2] = DHT11_Read_Byte();
        buffer[3] = DHT11_Read_Byte();
        buffer[4] = DHT11_Read_Byte();
        if (DHT11_Check_Sum(buffer) == DHT11_OK)
        {
            humidity = buffer[0];
            temperature = buffer[2];
        }
    }
}

void Read_LightIntensity(void)
{
    lightIntensity = ADC_GetConversionValue(ADC1);
}

void Read_SmokeDensity(void)
{
    smokeDensity = ADC_GetConversionValue(ADC1);
}

int main(void)
{
    GPIO_Configuration();
    ADC_Configuration();

    while (1)
    {
        Read_DHT11();
        Read_LightIntensity();
        Read_SmokeDensity();

        if (temperature > 30 || humidity > 70)
        {
            Alarm_On();
        }
        else if (smokeDensity > 500)
        {
            Alarm_On();
        }
        else
        {
            Alarm_Off();
        }

        if (lightIntensity > 1000)
        {
            LED_On();
        }
        else
        {
            LED_Off();
        }

        delay_ms(1000);
    }
}

注：以上代码需要配合DHT11温湿度传感器、MQ-2烟雾传感器和光敏电阻模块使用。其中DHT11的驱动代码和延时函数的代码可以在网上找到。