Closed loop vrs open loop

Community General Discussions
1

I’m interested in the PT785-S Pan & Tilt System from the shop here (I think it made by servo city) and they are saying it a “Closed Loop” system. I’m wanting to use it wirelessly with my RC transmitter and receiver and what to use the TX sticks to control the pan and tilt. The way I understand the closed loop is that as soon as you release the TX stick the mount moves back to the original/start position?

Is there a way to change this and make it more like an “open looped” system so the mount will stay in position when the TX sticks are released? I want to use this for photography and video and you can’t really line up the shots then control the camera via the laptop if the camera mount is going to move as soon as the sticks are released.

Could someone please tell me if this can be changed in some way.

Thanks
Craig

2

Correct. The system uses two 1/4 scale servos. The one issue is that you need to know if your receiver / battery can power two 1/4 scale servos. To make it more open loop, you would need to either change your joysticks, or change the system to something like the PT-2100 (which uses gear motors). Alternatively, as you indicate, you can control it from the computer using a servo controller; it could behave as open or closed loop since it’s a question of software.