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Hi,

I need to switch a camera (HackHD) on/off through mavlink. Therefor I thought about using the PCF9574 I2C IO expander like this one:

http://www.amazon.com/Expansion-PCF8574-Expander-Evaluation-Development/dp/B00DUO17J6/ref=sr_1_1?ie=UTF8&qid=1428091838&sr=8-1&keywords=pcf8574

Of course I need to add a FET to switch the load and add a telegram/message to the mavlink protocol. Is there some code in arduplane I could build up on?

Any other, maybe easier, way to do this like just using GPIO port or something else?

Thanks for every help,

Max