The multi-contactor is a simple thing which needs only some attention when connecting the electrical circuits.
A servo-motor is used to select each circuit. This selection is done on a circuit-board 45x30mm on which the undesired parts have been scrapped off. An arm, rotated by the servo move the contact to each position. Then on each position, the second channel command will action each motor, or another command.
1 receiver
2 servo-motor, channel 1
3 selector
4 electronic board of servo, channel 2
5 motor pan-rotation
6 tilt motor
7 motor for framing
8 shutter release of the camera.
The photographs show the two radio-remote control modules, and detail of the rotating arm.
This system is easy and very convenient to use; it is also energy saving, thus low-cost and long-life for batteries.