GI: "YarGauge" replacement clock module (Digital Tach, etc.)

[CTScott]

Originally Posted by yappari

Are you by any chance using an Arduino for the microcontroller for all of this or are you programming your own PIC? I've recently started ordering some electronics to do something similar but probably not as sophisticated as what you're planning. I've read that an ELM preprogrammed pic is great for interfacing with the CAN bus, but it seemed a little costly and difficult to use. I asked an electric engineer where I worked (I used to work as a plastic engineer at the Corolla plant) and he said that I shouldn't have a problem interfacing with the ISO bus for Toyota cars if it's a cheaper/easier solution. I've got all the parts but the programming is still killing me even in this with the easy platform of the Arduino though, I'd like to keep hear about your progress though. Please keep us updated

I'm using two PICs within the design. One dedicated to the CAN Bus communication and the other for the user interface, direct RPM sampling and temp input.

The ELM PIC is way too expensive at $23 each. I built a code reader for ISO-9141 (K and L line comm) about ten years ago. The messaging for the CAN bus is very similar to OBDII, so most of my work thus far was redoing my hardware interface for CAN.