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I'm pretty sure that if the trigger for the camera doesn't require too much force, you can get away with it by using the servo horn to push it.
As for control method, you don't cut out the power via a relay, power to the servo controller is always on. you just change the signal (there is no pot). The signal should be between 1ms and 2ms wide, to give you the required angular position.Since you made a little shiny thing on your picture instead of an antenna, it just popped into my mind that you could actually use IR for triggering the servo, instead of RC, which is expensive.
But you will need a microcontroller, anyway.
I'm sure others here will be better to help with the servo question, but when I saw your idea I immediately thought of using a linear actuator ?
A linear actuator (solenoid) might be much simpler in your case, since it simply requires DC with polarity reversal (so no signals or microcontroller needed). The servo horn is the servo's arm, that black/white round/cross/line/circle thing you stick on the output gear.
A linear actuator (solenoid) might be much simpler in your case, since it simply requires DC with polarity reversal (so no signals or microcontroller needed).
Now the idea of a linear actuator seams promising. I need to ask simple questions though. If I have a linear actuator and I introduce power to it does it extend? If I continue to apply power does it stay in the extended position? If I take the power away, what happens? I ask this because of my limited electronics knowledge. If I can wire a simple switch to it and flip the switch to have the actuator extend, that would be great. I do not understand how to implement polarity reversal.Thank you again.
No problem they are quite simple ... Apply power and the rod in the middle extends out. Whilst power is applied it will remain extended. When you remove the power most will stay in that position but have no pushing force so the spring from your camera release would be enough to push it back in.
I'm not sure, but solenoids need current in one way to open and the other way to close. So you'll probably need an H-bridge to open/close it.