写一个PH传感器的代码

以下是一个基于STM32的pH传感器代码示例，包括了pH传感器的读取、温度补偿、以及通过串口将数据发送到上位机进行监控：

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

#define PH_SENSOR_PIN GPIO_Pin_0
#define PH_SENSOR_PORT GPIOA

double temperature = 25;//当前温度
double ph_value = 0;//当前pH值

double get_ph_value(){
  double voltage = read_ph_sensor_value();//读取pH传感器电压值
  double ph = 7 - (voltage - 2.5) / 0.18;//计算当前pH值
  return ph;
}

double read_ph_sensor_value(){
  GPIO_InitTypeDef GPIO_InitStructure;
  ADC_InitTypeDef ADC_InitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_InitStructure.GPIO_Pin = PH_SENSOR_PIN;
  GPIO_Init(PH_SENSOR_PORT, &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_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);
  ADC_Cmd(ADC1, ENABLE);
  ADC_ResetCalibration(ADC1);
  while(ADC_GetResetCalibrationStatus(ADC1));

  ADC_StartConversion(ADC1);
  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
  uint16_t adc_value = ADC_GetConversionValue(ADC1);
  ADC_Cmd(ADC1, DISABLE);
  return adc_value * 3.3 / 4096;//计算当前电压值
}

double get_temperature(){
  //读取当前温度值
  return 25;//此处为示例，实际需要根据硬件配置和需求进行相应的修改
}

void USART1_IRQHandler(void){
  if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET){
    uint8_t data = USART_ReceiveData(USART1);
    if(data == 't'){
      temperature = get_temperature();//读取当前温度值
    }
    USART_ClearITPendingBit(USART1, USART_IT_RXNE);
  }
}

int main(void){
  init_usart();//初始化串口
  while(1){
    ph_value = get_ph_value() - 0.03 * (temperature - 25);//温度补偿，此处假设每度温度偏差0.03
    USART_SendData(USART1, ph_value);//通过串口将当前pH值发送到上位机
  }
}

注意，上述代码仅为示例，实际的代码还需要根据具体的硬件配置和需求进行相应的修改和优化。