[Katada]

Hello,

a bit of story so please bare with me.

My 92 Audi 80 originally had 2.3L NG 5-cyl engine with Bosch K-Jetronic CIS injection, tried EFI using MS1 clone based on Atmega 328 (fuel only), batched injection, it worked and revved, but somehow rough on idle, see pictures attached.

But due to a series of unfortunate events I had to put this project a side, now, I hope it's time to finish it as planned.

My goal is to build speeduino to function the basics, sequential injection, COP ignition rather than stock dizzy if applicable, closed loop idle control, warm-up enrichment, load compensation (A/C, electric fans, tranny load, lights, heaters, etc), anything else is considered a non-useful since the engine has no EGR, no VVT, no turbo, ...,

I have Mega2560, STM32F103C8T6 (aka black bill), ESP32, and Atmega 32A, but not Teensy, however, since space is premium, I do prefer to use the smallest board to keep the foot print as little as possible, if the black bill as example needs I2C flash then I have several chips as well.

I've searched this forum a lot but here the main focus is on the mega2560 and Teensy, anyone has tried the other boards I mentioned ?, could you kindly share your experience and results ?

Thanks.

Katada

[dazq]

Hi,
Well the f103 is usually considered a bluepill( though yes black examples do exist)

The true blackpill with f401 and f411 have been tried and some users have working code variants. There is even an adaptor board to use it on a STD speeduino board designed for a mega.
This is what I refer to.
https://www.cnx-software.com/2019/12/24 ... spi-flash/

Get onto slack and ask @vitor he's your man for blackpill work Inc that PCB.

[Katada]

Hi dasq,

Appreciate your input, I guess my black pill is a bit older than the one you referred, have a look here:

https://stm32-base.org/boards/STM32F103 ... -Pill.html

Heading to slack

Thanks.

[NickZ]

if you want small foot print then Teensy and STM are out of the question, you need a lot of extra components for 5 to 3.3v conversion. best to stick with the ATMEGA 2560.

[jevgienij]

https://www.aliexpress.com/item/32967417746.html

Cheap, widely available and fully compatibile with original Mega. I'm creating a pnp board for my car using this board.

[Katada]

if you want small foot print then Teensy and STM are out of the question, you need a lot of extra components for 5 to 3.3v conversion. best to stick with the ATMEGA 2560.

If the f103 fits and perform reliably, the rest shouldn't be hard to solve as my main concern is the limited size of my the candidate host.

https://www.aliexpress.com/item/32967417746.html

Cheap, widely available and fully compatibile with original Mega. I'm creating a pnp board for my car using this board.

Nice board, will definitely look into it.

Thanks.

[dazq]

F103 support has been dropped from main development, only stm32f4 is being included currently.

[NickZ]

If you want small, I make a small MEGA2560.
Ignore the dust and bodge wires, these are just samples i have sitting in my work area.

20201229_190944.jpg (391.57 KiB) Viewed 5053 times

20201229_191102.jpg (402.87 KiB) Viewed 5053 times

20201229_190916.jpg (670.57 KiB) Viewed 5053 times

and a small fully functioning ecu.

[Katada]

NickZ, nice work, what would be the cost considering the tasks I listed in my first post ?