[help needed] E85 / Flex fuel logic

[YuMe3D]

Great thank you..
Will post some pics in the Early part of the new year.

[mck1117]

progress is being made!

https://github.com/rusefi/rusefi/pull/2189

and

https://github.com/rusefi/rusefi/pull/2190

[SHOf429]

Very excited to see the progress on the flex fuel sensor. Any recommendations/requirements as to which pin to use? I know it has to be configured as open drain with a pull-up.

[AndreyB]

Do we have a sample tune and sample log of the sensor actually working? Do we actually log flex fuel?

[mck1117]

Do we have a sample tune and sample log of the sensor actually working? Do we actually log flex fuel?

We log it, the channel is called "flex ethanol %" or something like that. You can watch the impact of target afr changing even as target lambda stays constant.

I tested on the bench with a function generator, but to my knowledge nobody has plugged it in to a real sensor yet.

[mck1117]

Very excited to see the progress on the flex fuel sensor. Any recommendations/requirements as to which pin to use? I know it has to be configured as open drain with a pull-up.

On proteus any digital input will work. On MRE, you should be able to use the analog temp inputs or the cam input. Analog volt inputs should work too, but will require an external pullup resistor.

[SHOf429]

Very excited to see the progress on the flex fuel sensor. Any recommendations/requirements as to which pin to use? I know it has to be configured as open drain with a pull-up.

On proteus any digital input will work. On MRE, you should be able to use the analog temp inputs or the cam input. Analog volt inputs should work too, but will require an external pullup resistor.

I am setting up a Frankenso 0.5.6 board at this time. Anything special about that board?

[mck1117]

I am setting up a Frankenso 0.5.6 board at this time. Anything special about that board?

In that case, you can use any analog input, provided that you install a pullup resistor on that channel.