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A HUGE Thank You to everyone who participated in the forum, especially obviously to Pizman and Stephan who did an outstanding job over so many years providing an incredible service to the MobiFlight community.

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Message #6856

pizman82

Moderator

From: ETSI, Germany

Posts: 6010

Supporter

Pretty Shure Stephans links give you all the information !..... You should read them!

But in short words....

1. Wrong:
The Number of this DropDown only mean " How many Displays are set to THIS Device Port"
If you set ONE Display you choose "1" (If you set 4 Displays on 4 different Device entrys 3Pins all single without chain then ALL 4 Devices must have "1" ... Cause always only ONE Display is set at ONE Deviceentry)
If you make a chain with 4 Displays for example then you must set "4" cause now on this Device ( 3 Pins) are set 4 Displays in a row !

2. Not recommend
You can split 5V and GRD ... Maby you can split CLK, too.... But DN cant be split.... Cause it support the Data in a array that MUST get through the Displays in a correct sequence.
Whatever a Breadboard is not recomend in your final System..... You shoul solder all wires finaly.... Specialy in Max7219 Displays a little wrong contact in case of touching a wire occure in a Crash and you have to restart the Homecockpit every 5 Minutes !

Finaly.... The DN Line MUST chained from Display to Display..... If you do this already i recommend to use a 4 wire block and chaining the CLK,CS and GRD, too..... Same workflow but you have a garantee working system and its more tidy like you split the lines with a breadboard system !

Good Luck !

2017-11-26 09:30