mq7一氧化碳传感器stm32例程

以下是一个基于STM32的MQ-7一氧化碳传感器的例程：

#include "stm32f10x.h"

#define ADC1_DR_Address    ((uint32_t)0x4001244C)

uint16_t ADC_ConvertedValue;

void ADC_Configuration(void);
void GPIO_Configuration(void);
void USART_Configuration(void);
void USART_SendString(char* s);
void Delay(__IO uint32_t nCount);

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

    while (1)
    {
        ADC_SoftwareStartConvCmd(ADC1, ENABLE);
        while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
        ADC_ConvertedValue = ADC_GetConversionValue(ADC1);

        char buffer[50];
        sprintf(buffer, "CO: %d ppm\r\n", ADC_ConvertedValue);
        USART_SendString(buffer);

        Delay(1000000);
    }
}

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    // Enable GPIOA and ADC1 clock
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_ADC1, ENABLE);

    // Configure PA0 as analog input
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void ADC_Configuration(void)
{
    ADC_InitTypeDef ADC_InitStructure;

    // ADC1 configuration
    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);

    // Configure ADC1 channel 0
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);

    // Enable ADC1
    ADC_Cmd(ADC1, ENABLE);

    // Calibrate ADC1
    ADC_ResetCalibration(ADC1);
    while(ADC_GetResetCalibrationStatus(ADC1));
    ADC_StartCalibration(ADC1);
    while(ADC_GetCalibrationStatus(ADC1));
}

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

    // Enable GPIOA and USART1 clock
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);

    // Configure PA9 as TX
    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);

    // Configure PA10 as RX
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // USART1 configuration
    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);

    // Enable USART1
    USART_Cmd(USART1, ENABLE);
}

void USART_SendString(char* s)
{
    while(*s)
    {
        while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
        USART_SendData(USART1, *s++);
    }
}

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

此例程通过ADC读取传感器输出的模拟电压，并将其转换为CO浓度值，然后通过USART将其发送到计算机。在此例程中，PA0被配置为ADC输入，PA9和PA10被配置为USART1的TX和RX端口。

请注意，此例程仅用于参考。在实际使用中，您需要根据您的硬件配置进行适当的修改。