So has anyone done something similar to this? (maybe different hardware for the interfacing circuitry) The decode the data is where I am having issues. I want to log this data to SD Card (not a problem), Display important information on a LCD (not a problem), and decode the data. Unfortunately, with the ALDL stream each ECU/ECM and prom have a slightly different data stream. If you scroll down to "3.2 Circuit Design:" It shows 3 transistors (plus resistors) to control the sending/receiving on the bi-directional ALDL line. However, I found this project interesting and it is sort of on the track I want to go: There are plenty of schematics for interfacing a com port to the ALDL port: First I want to ask, has anyone has done a project with arduino (or compatible chip mega32u4 etc) and 8192 baud ALDL?
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