STM32F031驱动酒精传感器的代码
时间: 2024-05-07 18:18:46 浏览: 7
以下是一个简单的示例程序,用于驱动酒精传感器MQ-3,使用STM32F031微控制器。
```c
#include "stm32f0xx.h"
#include <stdio.h>
#define MQ3_PIN GPIO_Pin_0
#define MQ3_PORT GPIOA
float MQ3_GetValue(void);
int main(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
// Enable GPIOA clock
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
// Configure MQ3_PIN as analog input
GPIO_InitStruct.GPIO_Pin = MQ3_PIN;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(MQ3_PORT, &GPIO_InitStruct);
while (1)
{
float value = MQ3_GetValue();
printf("MQ-3 alcohol sensor value: %.2f\n", value);
}
}
float MQ3_GetValue(void)
{
ADC_InitTypeDef ADC_InitStruct;
uint16_t adc_value;
// Enable ADC1 clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
// Configure ADC1
ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStruct.ADC_ScanDirection = ADC_ScanDirection_Upward;
ADC_Init(ADC1, &ADC_InitStruct);
// Enable ADC1
ADC_Cmd(ADC1, ENABLE);
// Wait for ADC1 to be ready
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));
// Start conversion
ADC_StartOfConversion(ADC1);
// Wait for conversion to complete
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
// Get ADC value
adc_value = ADC_GetConversionValue(ADC1);
// Disable ADC1
ADC_Cmd(ADC1, DISABLE);
// Compute alcohol concentration in ppm
float voltage = ((float)adc_value / 4096.0) * 3.3;
float concentration = (voltage - 0.1) * 100.0;
return concentration;
}
```
此程序使用ADC模块读取MQ-3酒精传感器的模拟输出值,并计算酒精浓度(以ppm为单位)。请注意,此示例程序仅供参考,实际应用中可能需要根据传感器的特性进行调整。