Wideband Controller: Fully Custom, no ASIC!

[AndreyB]

I am soldering a pair of those on hellen121nissan

One flashed OK and blinks LED happily now, but the other one I have GND and VCC connected somehow. Image is with chip already removed and flux and stuff. I only have one board here so cannot confirm if untouched board is like that.

Does anyone see any questionable spots? I know those images are not great but that's the best I am able to manage

image.png (26.96 KiB) Viewed 106864 times

[JRD McLAREN]

I'm found some STM32F072CBT6 MCUs in LQFP48 ..
Will it work ..??

has CAN
instruction set M0

[AndreyB]

LQFP48 ..

would be hard to solder it on the existing LQFP32 PCB

[JRD McLAREN]

OK..
but "my addon board is in progress" ...

[joaodh]

Great project,
I'm trying to get the stm32f042k6, but seems to be out of stock into almost everywhere. It's expected to be compatible with another MCU?

[ssmith]

I was looking through the code and schematics, and noticed that both Vm and LSU_Vm are routed to the MCU. At first I thought that was so the MCU could detect if LSU_Vm was being dragged down for some reason, but as far as I can tell the code only samples at Vm, not LSU_Vm. Is this just a left over connection from development?

If so you might want to remove it; leaving it in means the MCU is directly connected to an external pin. Not that the 10 ohm resistor for R9 is going to save the MCU from an external event, but still....

[AndreyB]

https://github.com/mck1117/wideband/issues/29

[ssmith]

Maybe this is more of a software question, but any plan to implement barometric compensation for lambda calculation?

Bosch has a nice chart that shows at 0.85bar ambient the 'lp' value is about 5% lower for the same lambda. That's like driving in Salt Lake City (well maybe more like 0.88bar).

Interestingly the chart goes up to 2+ bar, presumably to account for exhaust backpressure, maybe in case it's mounted pre-turbo? Though I don't think it can withstand pre-turbo temperatures. I assume post turbo in an adequate exhaust that pressure is close to ambient? I really don't want to have to install a post-turbo exhaust pressure sensors...

[AndreyB]

I'd say that should be a GH ticket not a forum post

[mck1117]

Maybe this is more of a software question, but any plan to implement barometric compensation for lambda calculation?

Bosch has a nice chart that shows at 0.85bar ambient the 'lp' value is about 5% lower for the same lambda. That's like driving in Salt Lake City (well maybe more like 0.88bar).

Interestingly the chart goes up to 2+ bar, presumably to account for exhaust backpressure, maybe in case it's mounted pre-turbo? Though I don't think it can withstand pre-turbo temperatures. I assume post turbo in an adequate exhaust that pressure is close to ambient? I really don't want to have to install a post-turbo exhaust pressure sensors...

I think that refers to *differential* pressure, right? Not absolute pressure?

[ssmith]

I think that refers to *differential* pressure, right? Not absolute pressure?

It says absolute pressure of the exhaust gas. Section 3.3 of https://www.ecotrons.com/files/Bosch_LSU49_Tech_Info.pdf
Is there better PDF?

[AndreyB]

Is there better PDF?

our collection at https://github.com/rusefi/rusefi_documentation/tree/master/OEM-Docs/Bosch

[joaodh]

Today I received 5 boards, need to get the components to insert.
I'm expecting use the module as standalone without CAN, I will add a display to show the current values.
It's ok if I use the STM32F031K6T6?
I know that I will need to adapt some code, but I already have to do it to add the display.

Thanks for this great project

[AndreyB]

I'm trying to get the stm32f042k6

Please fill in "location" on your profile. Please post a "hello world" topic maybe?

I have some stm32f042k6 chips

[JRD McLAREN]

......., I will add a display to show the current values. ....

This is good Idea for the future ...
"Standard" 0-5V output will be welcome ... in my case ...
(and "1V" output also ... LAMBDA 1 = 1Volt)
(to use "standard Voltmeter" for lambda readings)

[joaodh]

Please fill in "location" on your profile. Please post a "hello world" topic maybe?

I have some stm32f042k6 chips

Sorry for that, I have updated some info about me on my profile. I don't see where should I make the hello world post.

I'm asking for the STM32F031K6T6 because I can get some of these one from AliExpress, without pay a lot for the shipping.

[AndreyB]

I don't see where should I make the hello world post.

https://rusefi.com/forum/viewforum.php?f=2

[stefanst]

I am currently bench testing a Proteus Honda K-125 board. This board has a built-in WBO controller. I built an adapter harness for the O2 sensor from the JST connector to an LSU 4.9.
The board is fully connected to a Proteus via pigtails. The Proteus is powered via USB. I'm feeding 12V from a lab power supply to the WB sensor and also into the proto area on the Honda board. Without the WB sensor we're sucking approx. 85mA, with the WB it's 120mA. The red LED on the WBO controller is dim. RPM self-stim is enabled at 1200rpm. I expected to see the WB sensor heating up with the rpm signal, but it seems to be in standby.
The canReadCounter is happily counting up. canWriteOk is also counting up.

This is the tune in question: https://rusefi.com/online/view.php?msq=787

[AndreyB]

The Proteus is powered via USB.

I believe it cares about proteus voltage as received via CAN. Let's give Proteus +12 volts as well?

[stefanst]

I am here to report success. Turns out there were some conditions that needed to be met for the WBO module to even kick on the heater:

Under "Controller" -> "Can Bus Communication" -> "Enable rusEFI Can Broadcast" = "true" must be set
Under "Sensors" -> "EGO Sensor" -> "Enable Can Wideband" = "true" must be set

There was also an opinion voiced that the board needs to see voltage on the "vBatt ADC Input" pin. This is as yet unconfirmed.

[de1phi]

can you share information on how to connect this module to the Frankenso board?

[mck1117]

can you share information on how to connect this module to the Frankenso board?

Connect CANH, connect CANL, make sure there's a terminating resistor at both ends of the bus, and that's it!

[opelpanfan]

Does anyone have STM32F042K6T in stock? Need 10 units in UK

[AndreyB]

Does anyone have STM32F042K6T in stock? Need 10 units in UK

https://www.shop.rusefi.com/shop/p/stm32f042k6t-lot-of-5

[Hmelik]

......., I will add a display to show the current values. ....

This is good Idea for the future ...
"Standard" 0-5V output will be welcome ... in my case ...
(and "1V" output also ... LAMBDA 1 = 1Volt)
(to use "standard Voltmeter" for lambda readings)

I also need this ))

[Hmelik]

Hello!
I try connect to controller, after pressit set index 0.
Wats wrong I do?

[AndreyB]

Wats wrong I do?

You do not post picture of your controller, you do not tell state of LEDs, you did not clarify if you have flashed your controller somehow. We have to assume the worst because humans are sometimes strange.

[Hmelik]

You do not post picture of your controller, you do not tell state of LEDs, you did not clarify if you have flashed your controller somehow. We have to assume the worst because humans are sometimes strange.

OK My mistake

[AndreyB]

Who would be the first one to try using FCM32F042? Maybe at least glance over Chinses datasheet?

But that's LQFP-48 not LQFP-32 like the official board.

https://lcsc.com/product-detail/Microcontroller-Units-MCUs-MPUs-SOCs_Flashchip-Microelectronics-FCM32F042C6T6_C2972836.html

image.png (29.31 KiB) Viewed 101746 times

[JRD McLAREN]

I have some PCBs for LQFP48 ...

EDITED:
10 pieces ordered ...