stm32f103rct6开发板烟雾报警器LCD显示烟雾值的main.c MQ2.c代码

以下是基于stm32f103rct6开发板的烟雾报警器LCD显示烟雾值的main.c和MQ2.c代码，仅供参考：

main.c

#include "stm32f10x.h"
#include "lcd1602.h"
#include "MQ2.h"

void Delay(__IO uint32_t nCount);

int main(void)
{
  uint16_t smoke_value;
  char str[16];

  /* 初始化LCD */
  LCD_Init();

  /* 显示欢迎信息 */
  LCD_ShowString(0, 0, "Smoke Alarm");
  LCD_ShowString(0, 1, "Initializing...");

  /* 初始化MQ2传感器 */
  MQ2_Init();

  /* 清空LCD显示 */
  LCD_Clear();

  /* 显示烟雾值 */
  while (1)
  {
    smoke_value = MQ2_Read();
    sprintf(str, "Smoke Value:%d", smoke_value);
    LCD_ShowString(0, 0, str);
    Delay(1000);
  }
}

void Delay(__IO uint32_t nCount)
{
  for (; nCount != 0; nCount--);
}

MQ2.c

#include "MQ2.h"

void MQ2_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  ADC_InitTypeDef ADC_InitStructure;

  /* 使能GPIOA和ADC1时钟 */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_ADC1, ENABLE);

  /* 配置PA1为模拟输入 */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* ADC1配置 */
  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);

  /* 使能ADC1 */
  ADC_Cmd(ADC1, ENABLE);

  /* ADC1校准 */
  ADC_ResetCalibration(ADC1);
  while (ADC_GetResetCalibrationStatus(ADC1));
  ADC_StartCalibration(ADC1);
  while (ADC_GetCalibrationStatus(ADC1));
}

uint16_t MQ2_Read(void)
{
  uint16_t adc_value;

  /* 启动ADC转换 */
  ADC_SoftwareStartConvCmd(ADC1, ENABLE);

  /* 等待转换完成 */
  while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));

  /* 读取ADC转换值 */
  adc_value = ADC_GetConversionValue(ADC1);

  return adc_value;
}