#Help with my project

1 messages · Page 1 of 1 (latest)

maiden crypt
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Hello everyone !
I'm a New member in discord and mobiflight !
So i hope i'm at the right place !
I got à ADF frequency selector from an A310.
I would like use the switches, optical incremental coder and 2 lcd 5 digit (7 segments) for some parameters, to have a physical interface between me and xplane 11.
My problem is: the lcd's (of wich i don't know the ref) are driven by a CD4056BF with BCD input.
Is it possible to use a I²C to BCD card to drive de lcd's with mobiflight ?
Both digit have is own CD4056BF
And the lcd have 41 pins.

Thanks in advance for your response !

Enjoy the day !

dreamy fox
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The 7 segment modules and LCD displaus are two different things in MobiFlight.

  • 7 segment LED displays that are supported use TM1637 or MAX7219 driver chips.

  • Character LCD modules are usually 16x2 or 20x4 or similar based on the Hitachi HD44780 LCD controller, that then usually are sold with a simple i2c adapter to use less pins when connected to an Arduino.

I am not aware of the CD4056BF but the datasheet says it is a 7-segment liquid crystal driver, so it is something different, and the answer unfortunately is, no. It is not supported.

If you are new to all this, I suggest you get either TM1637 or MAX7219 modules of suitable size.

There is also a possibility to write your own custom output device in MobiFlight to drive the specific chip or device directly, but it is most likely not worth the effort since you can get a supported display for a price of a cup of coffee.

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Of course if it is a genuine part, the custom firmware option might be something to pursue but it might be more work than you hoped for.

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but this is beyond what anyone can really help with directly, it requires reverse engineering skills and solid knowledge of electronics. OEM panels also often need much higher voltages etc, so there are more possibilities to really smoke things up.

But since we are on #projects-chat-😏😁 and not on the regular support section, you can of course share more details and photos of your unit and maybe someone can give some pointers to research further. But it is most likely not what you hoped for to get it working quick, unfortunately.

maiden crypt
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Thank you for response 🙂
The lot of work dont affraid me 😅 i wanna use this lcd's 😆
I had an idea but I would like your opinion on the matter.
I will use a MAX7219 card (without the 7 segments), I will use the 7 segment outputs to go to a 7seg->BCD converter (with logic gates) and then to the bcd inputs of the CD4056.
the "dig" outputs of the MAX7219 would be used for the "strobes" of the CD4056.

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with this idea, I hope that Mobiflight will detect my 7 segment as a max 7219