MobiFlight Community Support

Hello is there anything similar to this with 3 digits? for HDG,

KNACRO 8 Digital Display Module, MAX7219 Digital Display Control Module, Supports Cascading Eight Three Serial IO Port Control

Good Morning,

there are several posts already here reg. Max7219 and different modules sizes. Eg. here: https://www.mobiflight.com/forum/topic/6607.html and here https://www.mobiflight.com/forum/topic/6869.html

Cheers

Hi John
Please give us a LINK!

Then we can support you better !

OH! Yes. I am sorry, here is the link. Basically this is a 8 digit 7 seg display connected to a MAX 7219 on a small PCB board. Very compact and convenient. Unfortunately it has 8 digits, when the heading needs only 3 digits (example 000 to 359). I am looking for this pre-made board shown in the link below (from Amazon) with 3 digits, or a circuit diagram that shows me how to connect a Max 7219 to 3 digit LED 7 seg displays and a rotary encoder and a arduino mega. If there is a PCB board that I can buy, I can mount the Max 7219 and the 3 digit 7 seg displays and the encoder, then I can solder the components on the PCB and get the stuff shown below, but with 3 displays instead of 8. If I can buy the whole thing already made that would be the best.

https://www.amazon.com/Digital-Display-MAX7219-Supports-Cascading/dp/B01G1NHCYQ/ref=sr_1_1?crid=3MGV4WK7ORWV4&keywords=KNACRO+8+Digital+Display+Module%2C+MAX7219+Digital+Display+Control+Module%2C+Supports+Cascading+Eight+Three+Serial+IO+Port+Control&qid=1643208341&sprefix=knacro+8+digital+display+module%2C+max7219+digital+display+control+module%2C+supports+cascading+eight+three+serial+io+port+control+%2Caps%2C346&sr=8-1

I also tried the hyperlink button. Anyway, please copy and paste.

https://www.amazon.com/Digital-Display-MAX7219-Supports-Cascading/dp/B01G1NHCYQ/ref=sr_1_1?crid=3MGV4WK7ORWV4&keywords=KNACRO+8+Digital+Display+Module%2C+MAX7219+Digital+Display+Control+Module%2C+Supports+Cascading+Eight+Three+Serial+IO+Port+Control&qid=1643208341&sprefix=knacro+8+digital+display+module%2C+max7219+digital+display+control+module%2C+supports+cascading+eight+three+serial+io+port+control+%2Caps%2C346&sr=8-1

Hi

The link show a "MaxTube" ( thats how we called it here)
These are the Standard Tubes ( Blue PC with solder Diggits.... and Yes. 99% are Red and normaly all have 8 Diggits !
I never saw some with 3 .... But thats no Problem!

You have multiple ways!

1. Forget the Encoder.... thats a INPUT!
We currently talk about the Display.... So a PCB or a System to handle the disolay itself.
If you need a Encoder you can mount it next to the Display in your Panel and wire both to a Mega.
The Display and Max Chip have nothing to do with the encoder itself... So 2 Fully different Things !


2. Selfbuild by Wires
The cheapest and most direct way is to use a "different" Max Tube... Like THIS: (with green PC


Those have "removeable Diggits" You can pull of the 2x4 Display blocks and then you have 2x12 open Pin Connectors.
Then you can wire every 1-8 Digit Display ( Common cathode) to this Pins.


3 PCB
The best and perfect way is to use PCB.
We currently build them for our usage and maybe want to sell them
If you join our DISCORD https://discord.gg/99vHbK7 Stephan can show you Pictures.

For sure you could also Design a Complete PCB yourself including the Max Chip, the Display and your Encoder.


Summary: the question is... How perfect should be the result ?

Thanks. This is perfect!