空速计无法正确读数

paulchengyu

小弟使用的是ms4525do 空速计（实际上是动静压计）
想用来arduino上测空速
写了个代码但在静止状态下总是8m/s左右
想请教一下代码除了什么问题
谢谢！

https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7FMS4525DO%7FB2%7Fpdf%7FEnglish%7FENG_DS_MS4525DO_B2.pdf%7FCAT-BLPS0002

[mw_shl_code=bash,true]//#include <WireMW.h>
#include <Wire.h>   //I2C library 0x28H
byte fetch_pressure(unsigned int *p_Pressure); //convert value to byte data type


#define TRUE 1
#define FALSE 0

void setup(void)
{
  Serial.begin(9600);
  Wire.begin();
  delay(500);
  Serial.println(">>>>>>>>>>>>>>>>>>>>>>>>");  // just to be sure things are working
}

void loop()
{
  byte _status;
  unsigned int P_dat;
  unsigned int T_dat;
  double PR;
  double TR;
  double V;
  double VV;
  while (1)
  {
    _status = fetch_pressure(&P_dat, &T_dat);

    switch (_status)
    {
      case 0: Serial.println("Ok ");
        break;
      case 1: Serial.println("Busy");
        break;
      case 2: Serial.println("Slate");
        break;
      default: Serial.println("Error");
        break;
    }


    PR = (double)((P_dat-819.15)/(14744.7)) ;
    PR = (PR - 0.49060678) ;
    PR = abs(PR);
     V = ((PR*13789.5144)/1.225);
    VV = (sqrt((V)));

   
    TR = (double)((T_dat*0.09770395701));
    TR = TR-50;
   
  
   
   Serial.print("raw Pressure:");
   Serial.println(P_dat);
   //Serial.println(P_dat,DEC);
   //Serial.println(P_dat,BIN);
   Serial.print("pressure psi:");
   Serial.println(PR,10);
   Serial.print(" ");
   Serial.print("raw Temp:");
   Serial.println(T_dat);
   Serial.print("temp:");
   Serial.println(TR);
   Serial.print("speed m/s :");
   Serial.println(VV,5);
  



    delay(1000);
  }
}

byte fetch_pressure(unsigned int *p_P_dat, unsigned int *p_T_dat)
{


  byte address, Press_H, Press_L, _status;
  unsigned int P_dat;
  unsigned int T_dat;

  address = 0x28;
  Wire.beginTransmission(address);
  Wire.endTransmission();
  delay(100);

  Wire.requestFrom((int)address, (int) 4);//Request 4 bytes need 4 bytes are read
  Press_H = Wire.read();
  Press_L = Wire.read();
  byte Temp_H = Wire.read();
  byte  Temp_L = Wire.read();
  Wire.endTransmission();


  _status = (Press_H >> 6) & 0x03;
  Press_H = Press_H & 0x3f;
  P_dat = (((unsigned int)Press_H) << 8) | Press_L;
  *p_P_dat = P_dat;

  Temp_L = (Temp_L >> 5);
  T_dat = (((unsigned int)Temp_H) << 3) | Temp_L;
  *p_T_dat = T_dat;
  return (_status);



}
[/mw_shl_code]

请问一下4180

兄弟  解决了没

请问一下4180

之前只插了一个 两个空速软管都插上就可以了