7 segments display connection

Hi there valentin

As described in the website, it is easy to connect three modules in series you just have to follow the instructions on the picture:


After soldering the wires between three modules, you just have to use the pins to connect to the power supply and arduino like in the picture below. I'm using a PC power supply, but you have to be careful to use +5V output.



Regards Albeagle

That Adapter is too small. I would recommend at least 5V 4A. A PC power supply would be perfect or something like this:



Here is the link



That is correct. Just make sure you solder the wire on the side next to the chip like in the picture.

AlbEagle

I think you have added +$10000 two times. One time in the condition field and another time in the compare field. You just need to use it one time. Check and compare with Nav1 STBY as it shows correctly.

AlbEagle

Great to hear it is working. As posted in a previous post, My cockpit is not here, it is in the third floor and I have been using Arduino Mega cards for different projects as I only have two Arduino Mega 2560. I do have the config file, I don't know if it will help, anyway it is worth giving it a try.

Arduino Mega number 1 is named Kryesori with this config. Here you can download the mfmc file which you can upload directly to your arduino nr 1.

kryesori.mfmc (1.38 KB)

<?xml version="1.0" encoding="utf-8"?>
<Config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 <ModuleName />
 <PowerSavingTime>600</PowerSavingTime>
 <LedModule Name="Com1Display" DinPin="22" ClsPin="24" ClkPin="26" Brightness="15" NumModules="8" />
 <Encoder Name="COM1Mhz" PinLeft="2" PinRight="3" />
 <Button Name="COM1Switch" Pin="53" />
 <Button Name="NAV1Switch" Pin="52" />
 <Encoder Name="COM1Khz" PinLeft="4" PinRight="5" />
 <LedModule Name="COM2Display" DinPin="28" ClsPin="30" ClkPin="32" Brightness="15" NumModules="6" />
 <Encoder Name="NAV1Mhz" PinLeft="7" PinRight="6" />
 <Encoder Name="NAV1Khz" PinLeft="8" PinRight="9" />
 <Button Name="COM2Switch" Pin="51" />
 <Button Name="NAV2Switch" Pin="50" />
 <Button Name="TransOnOff" Pin="43" />
 <Button Name="AdfOnOff" Pin="45" />
 <Encoder Name="Com2Khz" PinLeft="10" PinRight="11" />
 <Encoder Name="Com2Mhz" PinLeft="12" PinRight="13" />
 <Button Name="DME1" Pin="39" />
 <Button Name="DME2" Pin="41" />
 <Output Name="AP Led" Pin="34" />
 <Output Name="SPD Led" Pin="36" />
 <Output Name="HDG Led" Pin="38" />
 <Output Name="ALT Led" Pin="40" />
 <Output Name="NAV Led" Pin="42" />
 <Output Name="APR Led" Pin="44" />
 <Output Name="REV Led" Pin="46" />
 <Stepper Name="Compass" Pin1="31" Pin2="33" Pin3="35" Pin4="37" BtnPin="5" />
</Config>


Here is the config file for the second Card.

MobiFlight Mega.mfmc (807 B)


<?xml version="1.0" encoding="utf-8"?>
<Config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 <ModuleName />
 <PowerSavingTime>600</PowerSavingTime>
 <LedModule Name="Com1Display" DinPin="22" ClsPin="24" ClkPin="26" Brightness="15" NumModules="8" />
 <Encoder Name="COM1Encoder" PinLeft="2" PinRight="3" />
 <Button Name="COM1Switch" Pin="53" />
 <Button Name="NAV1Switch" Pin="52" />
 <Encoder Name="NAV1Encoder" PinLeft="4" PinRight="5" />
 <LedModule Name="Trnsp" DinPin="34" ClsPin="36" ClkPin="38" Brightness="15" NumModules="3" />
 <Servo Name="FlapsServo" DataPin="51" />
 <Servo Name="VSIServo" DataPin="50" />
 <LedModule Name="COM2Display" DinPin="28" ClsPin="30" ClkPin="32" Brightness="15" NumModules="3" />
</Config>


Here is the Config file for the whole cessna cockpit and the radio panel together

mobiflightcessna172latest.mcc (140.06 KB)


So you have to upload the first two files in two Arduino Mega accordingly and then open the third file and choose the inputs/outputs. At least the two configs I put in the code section can help you to see the pins I have used.

About the wires yes you are right, there is a lot of wires, that's why I decided to build an entire Panel instead of different modules. This way there won't be any wires at all. only three usb cables from 3x Arduino Mega Cards to the PC for the whole Radio . I have calculated somewhat about 200 euro for the entire board with all the components. I will try to keep it as low as possible. Even with 20 euro profit from one radio I would (not be happy lol) sell it even though it has been a lot of work. I will also consider the possibility to sell it as a kit which means you get all the components and you have to do the soldering yourself. Only shipping from here to around the world cost around 27 Euro and I have to pay customs for some of the components including PCB-s. I'm still waiting for the PCB-s to arrive so once I get them and build the first one I will calculate the cost. But as always there is the option of building the radio yourself as documented in the website. I'll try to help whenever I can and whenever I have time. First time build is always the best with all the problems and challenges you face .

Regards AlbEagle

I have brought the switches with the LED to function. Thank you for providing the configuration. Could you give me more information about the ads NM and KN? How is the row interconnected between 7-segment and 14-segment?

I am sorry I have a flew I couldn't answer. I have started with one arduino Mega then purchased another one. Since I only had two arduino cards I wasn't using all funtions of the radio. Now with the new board there are 3xArduino mega cards needed for the radio to be fully functional.

For NM and KT letters you need two separate max7219 chips. You connect the 14 segment displays as in the picture on the website. It is important ro purchase cammon cathode displays as common anode won't work with max chip.

As for the autopilot leds, in the old radio I have drilled a small hole inside the button and added a 3mm led. In the new radio I have added the leds above the buttons of the autopilot. It is easier that way. There is another option to use buttons with leds incorporated on them, but those are 12v leds. I am planing to use those buttons with leds as kind if backlight for the buttons to be seen at night.


AlbEagle