MobiFlight Community Support

Hello everyone! Some time ago I started my cockpit simulator project with Airbus A320 OEM panels. In a long and difficult path I already have the pin-outs of some of the overhead panels but I have the following problem:

In the original panel, the bulbs of all the annunciators are connected with a common anode (one or two pins supplying 5VDC) and then each bulb has its specific GND pin. To control the panel with Mobiflight through Arduino I have directly connected the external power supply of the panel to the 5V pin and then each of the GND pins to one of the digital pins of the Arduino Mega, then the GND pin of Arduino back to the power supply.

With this system, it happens that the bulbs are on by default and turn off when the corresponding offset is activated (the opposite of what should happen). I know how Mobiflight works because I have used it on another occasion in a DIY project (wonderful software in fact).

My question is: Is there a way to reverse how this works? Maybe using the Sim Variable transformation option?

Thank you very much for reading this, I hope for your help!

that is the way the arduino works - all is input untill you initialise.

https://arduino.stackexchange.com/questions/66654/what-is-the-default-setting-for-a-digital-output-pin

Yes, I understand but, when clicking on the "test" button of the corresponding outup in Mobiflight program, the light turns off. Should that be the expected behavior?