CAM_FEEDBACK_PIN output 3.3V when it should not

@lanzo wrote:

I have a plane with Pixhawk where I use the shutter throught a circuit with 2 transistor, it works perfectly, now I want to use the CAM_FEEDBACK_PIN feature with a cable I made for the Canon S110 with a photoresistor that input 5V from PIN 102 and output 0V normally and 5V when the camera get picture hooked to an AUX channel set in the software by CAM_FEEDBACK_PIN.
The cable works very well if I test with external 5V supply but when hooked to the pixhawk it doesn't, so I have attached a voltmeter to the cable and discovered that when i set CAM_FEEDBACK_PIN 5x (tested 51 to 54) and test if it works clicking on "Do Action" "trigger camera now", the pixhawk immediately outputs 3.3V to the PIN I set with CAM_FEEDBACK_PIN, the 3.3V stay there until I remove battery, connect battery again and it goues to 0 Volts, click again on "Do Action" "trigger camera now" and goues to 3.3V.
I hope I have explained well myself.

CAM_DURATION,10
CAM_FEEDBACK_PIN,53
CAM_FEEDBACK_POL,1
CAM_MAX_ROLL,0
CAM_MIN_INTERVAL,0
CAM_RELAY_ON,1
CAM_SERVO_OFF,1100
CAM_SERVO_ON,1300
CAM_TRIGG_DIST,0
CAM_TRIGG_TYPE,1

RELAY_DEFAULT,0
RELAY_PIN,50
RELAY_PIN2,-1
RELAY_PIN3,-1
RELAY_PIN4,-1

I have tried to set RELAY_PIN2,53 and CAM_TRIGG_TYPE, 0 but same problem

Thank you

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