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Hello, i'm using APM 2.5 with ArduPlane 2.76 & i want to trigger a camera shutter at a certain waypoint by using DO_Digicam_Control or maybe DO_Set_Servo, but the condition is I must have one switch on my Futaba remote set to high, only then the servo should trigger otherwise not. 

So basically i need to check for the pulse at that input channel, then if its high, trigger the servo for camera shutter when the plane reaches the desired waypoint. 
How can i do this?
I can modify code given the right directions.