Low-z (LPG, etc.) injector dev. board

[Pepijn]

Hi,

I've been working on a custom hellen-one board that is able to drive up to 4 low impedance injectors. These are often used in LPG engines or high power applications. The form factor is identical to the microRusEFI, so the exact same housing and connector can be used.

The boards use 4x LM1949 to control injectors and require a little bit of thermal paste to dissipate heat to the aluminum housing.

I have 2 beta versions for sale:

[Left] With ETB controller (DRV8873) and rusEFI wideband controller, 2 issues manually fixed: DRV8873 enable pin externally powered from on-board 3.3V supply and 5V sensor supply IC swapped pins.

[Middle] Alpha version, not intending to sell.

[Right] Without ETB control, only an analog O2 sensor input and not populated 5V sensor supply, 2 issues manually fixed: short-circuit between MCU GND and random trace fixed and sensor 5V connected to on-board 5V supply.

Schematics are included. I can provide [Left] for €80 and [Right] for €40 excl. shipping (about €10 within Europe, about €20 to the USA).

I'm still load testing the [Left] version in my own vehicle and once it's ready I intend to purchase a batch to use and sell. You will receive a discount equal to the purchase price of the beta version for the final version.

Thank you.

[AndreyB]

This is so cool that's the first case of "hellen-one board in first post!"

What do you do for firmware - what bundle does this run?

[Pepijn]

Thanks!

To be honest I didn't spend too much time on the binaries and downloaded the latest pre-compiled I could quickly find. It's snapshot_20221104_192236_stm32407 but I can flash a later version if necessary.

[AndreyB]

I could quickly find. It's snapshot_20221104_192236_stm32407

What is your process to look for those binaries?

[Pepijn]

Non-existing . I happened to come across it during an earlier forum search and used that package while in my garage to flash the prototypes. If I understand correctly I should be able to use the "_discovery" bundles from the build server as the default/standard version for now, right?

[AndreyB]

If I understand correctly I should be able to use the "_discovery" bundles from the build server as the default/standard version for now, right?

i guess maybe probably? you are in the uncharged territory.