A friend of mine is biologist and needs to capture regularly ducks to control their health.
He has made a jail which door can be released easily (guillotine door), but this jail is going to be placed on a platform in the middle of a small lake. He has asked for my help to build a device to remotely close the door.
Our first idea was a Hobby remote controller and receiver to activate a servo to close the door.
But there are some limitations which worries us: