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Message: <blockquote data-quote="aidilj" data-source="post: 563859" data-attributes="member: 20536">Bro, read about the chip here <a href="http://elmelectronics.com/obdic.html" target="_blank">http://elmelectronics.com/obdic.html</a> , I'm using v1.3a. This chip doesn't need a pc to interface just that I use a pc in my application. You can access the ELM just through hyper terminal. The interface of the chip is serial as you can see in the schematic a max232 is used.The chip will handle the OBDII protocol with the car, you just need to talk to the chip through rs232. Your microcontroller needs to initialize the communication with the ELM then continously read data and you can do whatever you want, like put the reading on LCD or log readings.Cheers</blockquote>