#define ABP2_addr         		0x28
#define ABP2_write_addr         0x50
#define ABP2_read_addr          0x51

unsigned short ABP2_read(void);
unsigned long ABP2_pressure(void);
unsigned long ABP2_temp(void);
double ABP2_P_psi(void);
double ABP2_T_degC(void);