In-tech - I don’t know what you’re showing! A boat with ALDL? Do tell!! If you have some 7407’s laying around let me know, I’ll take them off your hands… 7407 is non-inverting. 7405 is same deal but inverting.

ALDL.jpg When I started working with ALDL a few months ago, I burned a lot of google time looking for a good circuit for the electrical integration of ALDL. I'd like to share the best one I've found. I think it offers some advantages over rivals. In my implementation, R1 is actually internal to the...

So this was kind of interesting and fun to figure out, but actually quite dumb! I have a raspberry pi in my project driving a gm tac module for drive-by-wire. The pi can calibrate the voltages coming back from the sensors any way I like. So no more resister networks! Software upgrades are the best !

Ever want to use and LS3 accelerator pedal or throttle body in an LS1 car? Here’s pic of accelerator out of 2017 Cruze adapted for TAC. Not so hard and still fully redundant. I’ll do a cleaner job with cable/ connector next time

Last stage…

Assembled board…

PicoTAC components…

I've been doing a study on the GM TAC module with the hopes of using the TAC hardware in a standalone DBW application (1965 Corvair if you're interested...). The TAC is very affordable, very reliable and fully redundant. Why not? Below is a summary of the ALDL message sent between PCM and TAC. At th...

The formats of tac/pcm messages are covered under J2178. They are type 3 read functions, 3 byte request, 6 byte response (+crc). This knowledge is not as comforting as it may seems since these functions notions are vendor defined, though there are standard encodings for things like tps and mph, so i...

Am working on reverse engineering tac and using a raspberry pi pico to replace pcm and allow tac to be used standalone. One thing I have learned is that the cpu used in the tac, a Fujitsu 6433038f, uses a rom mask. The code is etched in silicon, it has no ability to reflash. There are versions of th...