For anything related to the 'official' Speeduino boards (Eg v0.3, v0.4 etc)
By HayBurner408G
#54497
Thats really helpful info, thanks!

Just had a quick look and not sure if I can see it - please send me a link if you can find in your fork! Still getting my head around github....

im currently spark only, Im guessing I could leave the injector drivers off the board for now, in hopes I can find a suitable 3.3 capable FET in the same package that I can solder on if I ever go fuel injected, providing the gate resistors are also okay.
I was planning to then make a small B.O.B including the same opamp IC/resistor setup used in the teensy 3.5 shield and run it off a 5vref power tap from an existing ecu (No2c) for the extra I/O.

Just had a look at easy EDA - didnt even know it was a thing!

As I am still pretty ignorant to existing teensy designs, are there any that you would recommend to look at? I like the fact the official and the "big" unofficial speeduino boards are well documented and have schematics that are easy(ish!) to follow and a wider user base. That way I can pin stuff not working on my hardware rather than something that hasnt seen much real world use.

As a tangent - why on earth is there 3.3 and 5v? is it simply just for less losses/great efficiency capable by newer components, or is there a particular reason that newer hardware adopted 3.3v over 5v?
By dazq
#54499
This is a good example, I have one of these , he also has other designs too.
https://easyeda.com/b.brazdziunas/scg-main_copy

Here is the teensy stuff on my GitHub fork.
https://github.com/Autohome2/speeduino/ ... %20Adapter
Note the design was made using fritzing not kicad.

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