Any questions you have before you begin buying, building and installing.
By TheHoffman
#61004
Hi there, I'm currently restoring my 1993 Subaru Justy. I already swapped the engine from a carburated one to a fuel injected one. But because the ecu is from the early 80ies (probbaly), I wanted to swap it over to a Speeduino.

I looked at the official boards, and I kinda like the Dropbear/Teensy ones more than the ones with the Arduino. Probably not needed that much power, but dond't know just newer tech :)

I found this website ( https://easyeda.com/b.brazdziunas/projects ), which has some nice board designs uploaded. The 48 Way Teensy 3.6 is the one I like the most. Compact and two solid plugs. But the Teensy 3.6 is currently unavailable.

Josh shows the new improved Teensy 4.0 and 4.1 in a video, with the 4.1 being the same form factor as the 3.6. And he mentions he implemented the code for it already in the speeduino software. Now the big question: Would it be possible to get the pcbs build, and get like another daughter board that reroutes the pins from the 4.1 to the 'old' 3.6 pins? So I could use a 4.1 on this 3.6 board? Would this work with the software? A 3.6 is crrently like 200€, while a 4.1 is like 45. So even the costs for a daughterboard are manageable. Or let someone reengineer the board with the pins correctly for the 4.1
Either way, would it work on the software side? Cause hardware can be fixed easily, but I have no clue on whats possible on the software side.

Greetings from Germany :) Julian
By dazq
#61030
I have one of his other t3.6 powered boards and very nice it is too.
Yes you could design an adaptor board to convert from 4.1 to 3.6 pin out.

And yes the firmware would work, just the pin selection would need a tweek accordingly.

The t4.1 support is still getting more complete and rumours are Josh is working on a dropbear using a T4.1.
By TheHoffman
#61044
dazq wrote: Thu Feb 02, 2023 10:36 pm I have one of his other t3.6 powered boards and very nice it is too.
Yes you could design an adaptor board to convert from 4.1 to 3.6 pin out.

And yes the firmware would work, just the pin selection would need a tweek accordingly.

The t4.1 support is still getting more complete and rumours are Josh is working on a dropbear using a T4.1.

So would an adapter board be a legit option? Didn't think it would a viable solution :)

How hard is it to change the pin selection?

Yeah so if he drops one it get's even easier :)
By dazq
#61047
TheHoffman wrote: Fri Feb 03, 2023 12:54 pm
dazq wrote: Thu Feb 02, 2023 10:36 pm I have one of his other t3.6 powered boards and very nice it is too.
Yes you could design an adaptor board to convert from 4.1 to 3.6 pin out.

And yes the firmware would work, just the pin selection would need a tweek accordingly.

The t4.1 support is still getting more complete and rumours are Josh is working on a dropbear using a T4.1.

So would an adapter board be a legit option? Didn't think it would a viable solution :)

How hard is it to change the pin selection?

Yeah so if he drops one it get's even easier :)
To convert from t3.6 to t4.1 is not too difficult as any level shifting due to the 3v3 levels needed are already done(or at least should be) . Converting from t3.5 is not so easy as most designs rely on its 5v tolerance.

Changing pins is done in the init.ino, Create a new board type and set them up or modify an existing layout.
If you make the design open and files fully available Josh may even include it in the release firmware ongoing.
By jackdelange
#61786
hello
I also made the same from his design https://easyeda.com/b.brazdziunas/projects.
you can swap the 3.6 with 4.1, and assign the pins in init.ino. make a new case number (i made case 5 ) and then you must also change speeduino.ini in the reference folder.
there is a line pinLayout (see below)
;pinLayout = bits, U08, 15, [0:7], "Speeduino v0.1", "Speeduino v0.2", "Speeduino v0.3", "Speeduino v0.4", "INVALID", "caddy", "01-05 MX5 PNP", "INVALID", "96-97 MX5 PNP", "NA6 MX5 PNP", "Turtana PCB", "INVALID", "IN etc

it starts wit case 0 (that is speeduinov0.1 )etc
i changed case 5 from "INVALID" to "caddy"
now you can in tunerstudio find under settings - engine constants - board layout the name caddy

i must say it is not working perfect with a 8 cylinder sequential. (at low rpm it crashes, timer overflow i think)
but it is working when i select a paired 8 cylinder. but that is not my goal.
b.t.w. it is a nice PCB board but some parts are hard to get.
and on the board is a second processor (PSOC) for the wideband O2 sensor that you must program, also not so easy.
eventually i managed to program it, but i must say the worked fine.

greet Jack
By jackdelange
#61787
b.t.w. i have a spare PCB without components.
if you interested, i can send it to you? but you also can order it at JLCPCB.com.
greetings Jack

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