MobiFlight Community Support

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Message #7268

nunasims

Posts: 1

Hello Everyone,i want to know if there is a limit of how many LCD display i can connect with I2C ?
i do have 3 connected right now on the following address
0x23
0x26
0x27
only 2 of them work at the same time i tried replace the board or the lcd but the same problem
with the same configuration i wrote a simple lcd arduino code and all 3 of them working good and getting different information

any idea why mobiflight limit the amount of lcd or maybe i am missing something ?

Best

2018-01-10 20:29

Message #7276

StephanHo

From: EDDG, Germany

Posts: 1867

Supporter

Hi nunasims,

welcome to MobiFlight!

Basically, you can connect up to 127 IIC devices. However, the address space of popular IIC controllers is limited to 10 (I think).

Why only 2 of 3 LCD displays of yours are running, I do not know. Normally this should not be a problem. Maybe pizman or Sebastian can tell you something about that.

Grüße,
Stephan (Time: UTC+2)

2018-01-11 20:31

Message #7283

pizman82

Moderator

From: ETSI, Germany

Posts: 6010

Supporter

Hi.

I´m not 100% shure, too....
But i think Sebastian said he limmit the IC2 Devices at "2" per board.
Again i not remember 100%.... Maby he can comment this himself.

If possible please confirm..... Can you set your 3 Displays with 2 Arduino MEGA ?? So Mega1 got Display A and B and Mega 2 got Display C.
I think THAT should work.... Then you can simply use additional MEGA Controlelr to set 2 Displays each.

Finaly Sebastian must explane this.... Maby this was just for testing and he can simply extend this limmit to 4 Displays or more per board!

Good Luck !

2018-01-12 23:09