I thought I was going to make an RC camera release so my wife could take pictures of grouse. Please tell me where I went wrong!

I made a bracket and mounted a T-Pro SG-90 servo over the camera shutter. I connected the servo to the Gear channel of a Spektrum AR6115 rx, connected the end of a servo lead to a 6V power supply (four AA batteries in series) and plugged that into the Throttle channel on the AR6115. I bound that to a Spektrum SP5DSM Tx, and turning the Ch5 twist knob on the transmitter initially turned the servo to trip the shutter. Shortly after, it quit. The rx LEDs still flash when I try to bind it again, but then they go dark and the servo doesn't work plugged into any Rx channel. It does still work plugged into my quadcopter's AR6210 Rx, so it appears I've fried the AR6115.

What went wrong? I looked up specs for the AR6115. Spektrum says the input voltage can be 3.5-9.6V. Specs for the servo say 4.0-7.2V. It seems like this should have worked. The only thing that occurs to me is maybe I need to use my Dx6i, so that the Gear channel will be on/off rather than the twist knob on the LP5DSM tx.

I have an AR6100E I could try, but if I've made some stupid mistake, I don't want to fry two receivers in quick succession. Was this just bad luck, or did I do something to fry the AR6115?

nobody?

From your description I dont see anything wrong...Double check your not plugging a servo connevtor in backward, or reversing polarity anywhere

Did you twist the knob back and forth so that the servo arm only momentarily pressed the camera trigger, and how did you determine how far you needed to turn it? Seems to me you might have tried to move the servo arm further than the camera would allow it to go, and therefore stalled the servo. Holding it a bit longer than's maybe necessary could then compound the problem, resulting in something being overloaded.