Hi Guys,

Ive been working on a project trying to read the analog input from an Arduino board through serial, then display this on a qml gui in text form first and then move onto a rotating gauge.

I completed the process using qdebug at each step, so I'm reading the input until I come to the Q_PROPERTY stage and I get this error.

Qt Code: 
  1. C:\Users\Stephn\Documents\nissan300zx\serialport.h:48: error: 'double SerialPort::oil_pressure_volt' conflicts with a previous declaration
  2.      double oil_pressure_volt;
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^

Qt Code: 
  1. #ifndef SERIALPORT_H
  2. #define SERIALPORT_H
  3.  
  4. #include <QObject>
  5. #include <QQuickItem>
  6. #include <QSerialPort>
  7. #include <QSerialPortInfo>
  8. #include <QByteArray>
  9.  
  10. class SerialPort : public QObject
  11. {
  12.     Q_OBJECT
  13.     Q_PROPERTY(double oil_pressure_volt READ oil_pressure_volt WRITE set_oil_pressure_volt NOTIFY oil_pressure_volt_Changed)
  14.  
  15. public:
  16.     SerialPort(QObject *parent = 0);
  17.             SerialPort(QString);
  18.  
  19.             double oil_pressure_volt() const
  20.             {
  21.                 return m_oil_pressure_volt;
  22.             }
  23.  
  24. public slots:
  25.     void analogRead2();
  26.     void updateOilPressure(QString);
  27.  
  28.     void set_oil_pressure_volt(double oil_pressure_volt)
  29.     {
  30.         if (m_oil_pressure_volt == oil_pressure_volt)
  31.             return;
  32.  
  33.         m_oil_pressure_volt = oil_pressure_volt;
  34.         emit oil_pressure_volt_Changed(oil_pressure_volt);
  35.     }
  36.  
  37. signals:
  38.  
  39.     void oil_pressure_volt_Changed(double oil_pressure_volt);
  40.  
  41. private:
  42.     QSerialPort *arduino;
  43.     static const quint16 arduino_uno_vendor_id = 0x2341;
  44.     static const quint16 arduino_uno_product_id = 0x0001;
  45.     QByteArray serialData;
  46.     QString serialBuffer;
  47.     QString parsed_data;
  48.     double oil_pressure_volt;
  49.  
  50.     double m_oil_pressure_volt;
  51. };
  52.  
  53. #endif // SERIALPORT_H
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much appreciated for any help you can give me.