Reversed 7 Segment LED Value? | MobiFlight | Page 1

slender quail Jan 29, 2024, 9:57 PM

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Greetings all, I’m hoping someone can point me to a solution for reversed 7-segment LED display.
I have a Mega 2560 Pro with a 7 segment 3 digit Max7219 chip from Propwash Simulations. Their website says I’ll need to use the reverse function in MobiFlight.

I’m using it to display the course value in from the Captain side CRS display.

https://www.propwashsim.com/store/7segled

However, when I enable the Reverse digits option, the display goes blank. I’ve rebooted the Arduino, restarted MF, nothing brings it back unless I uncheck the reverse option, then it comes back. Any ideas? Shouldn’t I be looking at a different display? Thanks!

Update: I also tried selecting and 8 digit display and checking 6, 7, and 8 display options. Same result when enabling the reverse digits option, the display goes blank. During the test I can see the Adriano red LED flashing so I know the command is getting there.

PropWash Simulation - Flight Sim Radios

7 Segment LED — PropWash Simulation - Flight Sim Radios

6 Digit, 7 Segment LED with built on Max 7219 Chip for easy daisy chain. Great for making your own Flight Simulator Radios

slim sigil Jan 29, 2024, 10:27 PM

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ok, keep the 8 digits, select all 8 digits as active, use test value of 12345678

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with reverse digits activated.

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report what comes out on the display, if any

slender quail Jan 29, 2024, 10:39 PM

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slim sigil ok, keep the 8 digits, select all 8 digits as active, use test value of 12345678

Ok. I’ll try that in a little bit. Thanks!

slim sigil Jan 29, 2024, 11:05 PM

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In testing, I have also found that sometimes the Max7219 chip starts acting weird, requiring restarting Mobiflight.

slender quail Jan 30, 2024, 1:11 AM

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Ok. Here’s the test. All 8 active. 12345678.

First in test mode, rev opt off. (Yay)
Then in test mode, rev opt on (yay!)
Then in run mode (course 123 in the sim) rev opt off (shows 321, ok, expected)
Then in run mode (course 123 in the sim), rev opt on (shows 000) which might be correct???? If 123 is at the end but not shown.
Incremental progress, appreciate the support! Today was my first time building a board from scratch. 😬

slim sigil Jan 30, 2024, 1:26 AM

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like I said in the beginning, you need to select digits 6 7 8 when you have reverse option on.

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leave the number of digits at 8. Then activate positions 6 7 8 only

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reverse option on

slender quail Jan 30, 2024, 1:48 AM

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Just 678 turns the display blank, so I kept 8 digits but tried just displaying positions 1, 2, and 3 and FWIW it’s now working! 🤷🏻‍♂️ thanks for your help Jaime 🤙🏻

#Reversed 7 Segment LED Value?