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/*************************************************************************
* OBD-II (ELM327) data accessing library for Arduino
* Distributed under GPL v2.0
* Copyright (c) 2012 Stanley Huang <stanleyhuangyc@gmail.com>
* All rights reserved.
*************************************************************************/
#define OBD_TIMEOUT_SHORT 2000 /* ms */
#define OBD_TIMEOUT_LONG 7000 /* ms */
#define OBD_TIMEOUT_INIT 3000 /* ms */
#define OBD_SERIAL_BAUDRATE 38400
#define OBD_RECV_BUF_SIZE 48
#ifndef OBDUART
#ifdef __AVR_ATmega32U4__ /* for Leonardo */
#define OBDUART Serial1
#else
#define OBDUART Serial
#endif
#endif
// mode 0 pids
#define PID_RPM 0x0C
#define PID_SPEED 0x0D
#define PID_THROTTLE 0x11
#define PID_ENGINE_LOAD 0x04
#define PID_COOLANT_TEMP 0x05
#define PID_INTAKE_TEMP 0x0F
#define PID_MAF_FLOW 0x10
#define PID_ABS_ENGINE_LOAD 0x43
#define PID_AMBIENT_TEMP 0x46
#define PID_FUEL_PRESSURE 0x0A
#define PID_INTAKE_PRESSURE 0x0B
#define PID_BAROMETRIC 0x33
#define PID_TIMING_ADVANCE 0x0E
#define PID_FUEL_LEVEL 0x2F
#define PID_RUNTIME 0x1F
#define PID_DISTANCE 0x31
unsigned int hex2uint16(const char *p);
unsigned char hex2uint8(const char *p);
class COBD
{
public:
COBD()
{
dataMode = 1;
errors = 0;
}
bool Init(bool passive = false);
bool ReadSensor(byte pid, int& result, bool passive = false);
void Sleep(int seconds);
// Query and GetResponse for advanced usage only
void Query(byte pid);
virtual char* GetResponse(byte pid, char* buffer);
virtual bool GetResponse(byte pid, int& result);
virtual bool GetResponsePassive(byte& pid, int& result);
virtual bool DataAvailable();
byte dataMode;
byte errors;
//char recvBuf[OBD_RECV_BUF_SIZE];
protected:
static bool GetParsedData(byte pid, char* data, int& result);
static int GetPercentageValue(char* data)
{
return (int)hex2uint8(data) * 100 / 255;
}
static int GetLargeValue(char* data)
{
return hex2uint16(data);
}
static int GetSmallValue(char* data)
{
return hex2uint8(data);
}
static int GetTemperatureValue(char* data)
{
return (int)hex2uint8(data) - 40;
}
virtual char ReadData();
virtual void WriteData(const char* s);
virtual void WriteData(const char c);
};
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