The FMC itself consists of front panel, buttons, circuit board, psone screen holder, psone display and the related control board. You can see on the picture how it is assembled.
It is backlit with the usual 12V LED stripes put behind the front panel. It is very bright at the moment so i will control the brightness of the backlight with a LED dimmer from hongkong i pulled from ebay for 1€ per piece and 3 euro shipment fee.
I had trouble with milling the circuit board of the FMC, i broke 5 end mills (0.5mm) until i used 0.7mm mills. The circuit layout has been adopted from a website i fortunately found 2 years ago and downloaded the documentation that time. Now the website is gone. Sometime it pays of, just to download informations even when you need them in the future. The layout was adopted, which means i made the whole layout new with a program called “sprint layout” from abacom. Which is very good softare as it can create toolpaths for the cnc machine.
The connection of the PSONE lcd was done with the well known PSONE screen mod you can find everywhere in the web. Unfortunately the viewing angle of the psone screen is not the best and for the next fmc i will get a 5 inch display at www.lcdstore.deThis is the place where i also purchased an excellent 10.4 inch open frame display used as lower eicas screen.
How does it work?
The keypresses are recognized by an OC usbkeys card connected to the main computer. With sioc script (thanks Mario !) the key presses are changed into the right output values that the Open Cockpit FMC uses (as this is supported by PROSIM). Prosim reads the values from SIOC and controls the Prosim CDU application which is running on the client computer. The PSONE display in the FMC is connected also to the client computer and displays the output of the prosim CDU Application.