This is just another OBD2 solution for monitoring the sensors in a vehicle. It supports the K-line OBD2 serial communication between a vehicle and a microcontroller. This K-line communication is also known as ISO 9141-2 or ISO 14230-4 (also known as Keyword Protocol 2000 or KWP). Both ISO’s are almost similar. This solution differs from the rest that is low cost. It is low cost in the way that you don’t need an arduino, raspberry pi or smart phone. Just a microcontroller and LCD display so you can use your smartphone for other purposes.
Low cost OBD2 communications on K-line – [Link]