Based on these examples, it is possible to develop portable applications to diagnose personal vehicles using the DTC codes. In addition, examples of acquiring vehicle operating information such as Vehicle speed and Engine RPM are demonstrated. Some essential AT commands are also introduced to customize the behaviors of the ELM327L. To demonstrate the communication with OBD2 systems, a DragonBoard (or Raspberry Pi) is used to communicate with the ELM327 and request data from the OBD2 system. In this work, a device integrated a ELM327L protocol interpreter processor is introduced to perform the communication with OBD2 system. The OBD2 system also updates the vehicle operating conditions through the diagnostic trouble codes (DTCs). Real-time performance parameters of the vehicle such as Engine RPM, Vehicle Speed, Air Flow Rate, etc. The second-generation system, OBD2, sets some communication standards that allow external devices to communicate with the controller modules of the vehicle through the DLC port. The OBD systems have been mandatory for all cars and light trucks built in the US back in 1996. OBD (On-Board Diagnostics) is a computer-based system designed primarily to monitor the performance of vehicle engines and to control vehicle emissions.
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