I bought a EvZ Mini Interface Works on Android Torque Bluetooth Obd2/obdii Car Diagnostic Scanner (Mini), a PWOW® WIFI Wireless OBD2, OBDII Car Auto Diagnostic Scanner Adapter Reader, ELM327 for iPhone4S/5 iPad4 iPad mini and PC in XP System, with Micro Disc and a New Version V1.5 ELM327 OBDII OBD2 Bluetooth Car Diagnostic Interface Scanner because I want to code an application like OBD Auto Doctor. But first I'm trying to extract data from the car to some archive where I can process it. How can I do it?
OBD II is a standard. All the PIDs and the relavant formulas are available online. There is also a wiki on OBD II pids. The protocol to look for depends on whether your OBD is based in CAN or K-line