I'm thinking about building what would basically be a tube similar to the picture of this humane mouse trap, but the doors would be electronically controlled. The idea would be I could push a button on the arduino, and it could send a signal to close a door, and then push it again, and it could open the door.
The only issue is I haven't been able to find any examples of a very small electronically controlled door. The chicken coop doors are all basically like sliding barn doors, but that wouldn't work in my case. I'm unsure which opening mechanism to use, or the best way to attach a motor to drive it. Would anyone have any ideas or suggestions around approaching things on this scale?