Hi All, i need suggestions for part of a project.
I’m building a model of a Star Wars Turbo Laser turret, the kind seen blasting at Luke along the trench run, it uses a Raspberry Pi and camera to do face detection and tracking. I have face detection, barrel tilting, blaster recoil, LED flashing, and sounds all working happily, but the rotation of the turret is giving me some grief.
Mechanically it works with the whole thing sitting on a lazy susan style rotating bearing, and initially i used a standard servo, which worked, but only gave me about 180deg of movement. But i need 360deg, or full multiple rotation capability. I have a large gear integrated into the lazy susan bearing, and another gear on the servo spline.
I tried a continuous rotation servo, but they can only be told to go left or right, not by a specific amount, plus it was way too fast. Using the Adafruit servo library i can slow it to 0.1x speed, but even thats too fast. If i go down to 0.05x speed, it doesn’t have the torque needed to rotate the turret which weighs about 1kg. (its 3d printed and about 25x25x25cm).
My current thought is a stepper motor since i have a couple spare from a scrapped 3d printer, but since i need specific angle control, with 0deg being its normal “forward position”, and moving from that when tracking faces, i’m not sure it will work. At least with a servo i can say “move to 90deg, move to 10deg” etc. I cant do that with a stepper.