I need to build a setup, small as possible, to actuate 4 solenoids attached to 4 touch switches. It would also need to display an LED to show a switch was depressed and one to show the actuation of the solenoid (so as to be self-diagnosing, and to provide feedback for damaged nerves.)
This setup is going on a French horn to let me play again with my adducted left hand after a pair of accidents in the past 12 months. So it needs to be battery powered and small, and as lightweight as possible. If I need exact weights of valves and such, I can get them for a friend who's donating horn expertise (he's a well-known custom builder, and married to a good friend of mine.)
Anyone know where to start or what I'm looking for? As it's rotary motion, let me know if I'm barking at the wrong tree...