stm32烟雾传感器代码

以下是一个基于STM32的烟雾传感器代码示例，使用的是MQ-2型烟雾传感器：

#include "stm32f10x.h"
#include "delay.h"
#include "usart.h"

#define MQ2 A0

void ADC1_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    ADC_InitTypeDef ADC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = MQ2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    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_Cmd(ADC1, ENABLE);
}

u16 Get_ADC(u8 ch) 
{
    ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 );
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
    while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));
    return ADC_GetConversionValue(ADC1);
}

int main()
{
    u16 adc_value;
    float voltage;
    USART_Config();
    ADC1_Init();

    while(1)
    {
        adc_value = Get_ADC(0);
        voltage = adc_value*(3.3/4096); // 根据实际电压分压电路调整系数
        printf("ADC value:%d, voltage:%.2fV\r\n", adc_value, voltage);
        delay_ms(1000);
    }
}

注意，该代码仅供参考，实际应用中需要根据具体传感器型号和电路情况进行相应的修改。