Figure 1-1 depicts the full project from a hardware point of view.
I selected the Arduino MEGA 2560 because the digital I/O's #2 up to #13 support PWM. Therefore, I could use all libraries with their default PIN assignments. However, If one would like to use the Arduino UNO, it is also possible. However, make sure the PINs assigned to the servo's support PWM, e.g. PIN #3, #5, and #6.
The battery and ADIRS PCB fit into the Overhead panel of Flight Deck Solutions. It is easy adapting the mechanics of the PCB in the Fritzing tool.
The battery PCBA uses the MAX7219 to drive the 8 digits of the battery display (2x 4 digits). Hence, any hardware that is compatible with the MAX7219 can be used, e.g. 8 Char Segment-Display with MAX7219 (2020.07).
The ADIRS PCBA includes the dot matrix display modules of Broadcom Limited. I used 3x
HCMS-2912 (2020.07).
Together, 24 characters are available. This is sufficient to display the present position as N 30°29,9' W086°30,6'.
The ADIRS display in the real A320 aircraft doesn't use dot matrix display. But the Broadcom modules are the only
display modules I found that fit into the Overhead panel.
Figure 1-2 shows the components of the ADIRS project.
The LUA script ADIRS.lua is executed by FSUIPC or the WideFS client. The whole script is based on Flight Simulator offset changes and, hence, it is fully event driven.
On the Arduino side, the serialEvent() function is executed after the loop() function (see Arduino documentation). serialEvent() reads one full command and stores it for the loop() to be processed. Information sent back to the Flight Simulator are being processed within the loop().