Tilt Feedback Control
So this first test works! Get a range of about 100 analog readings for the 30 degrees of tilt.
Hot glued the potentiometer directly to the head
On to Pan Control - what kind of analog potentiometers have multiple rotations - I want to stick with analog as I don't want to count pulses or worry about location on startup - hey these cheap 10-turn rotating ones might do it! Hope the gear size for 1:10 can be worked out.
I did a few quick test prints to workout the smallest gear teeth that would printout correctly.
Love first print designs that are 95% working!
This 1:10 ratio is going to work great for pan control!
More Analog Please
Lets try to get more range out of our analog potentiometer
This gear was a pain to design. I tried to work out how much gear was needed.
The top bracket ended up being too flexible and the gears don't stay connected - fail!
Inside gear and smaller B103 wheel potentiometer
Seeing full range of analog values with this 1:10 setup - but this small 10,000 Ω B103 is a fail!
Hot melt glue got inside the wheel while gluing on the gear - there's a small hole in the wheel and hot glue flows nicely into it as you press the gear on.
potentiometer + hot glue = wheel doesn't turn
Tried a second time using tape to cover the small hole - it's still a fail!
Also See the not so nice tilt on the gear - these small pot's are easily damaged... This one turned into a 5,000 Ω.
Inside Gear it Is
A few issues with tilting:
- arms a bit too long
- arms a little bendy
- alignment of top and bottom bracket
Control Center - found these cute joysticks for control - nice wiring...
And it's Done!
- The servo on top is for zoom control.|
- The potentiometer holder still gets directly glued to head unit arm.
- If the glue doesn't hold - I've included holes to screw the holder directly into the arm. - Advantage of using the holder with the flipped potentiometer is that the gears are closer to the unit (keeping the gears aligned) and helps keep all the mess centered.
- Fixed: length and bendiest of tilt arms; added guide for alignment of top and bottom tilt bracket.
- Needed to add a cutout for the power feed into the camera.
- A wider camera would likely need a bit of a redesign with the top tilt bracket, add a spacer between to raise up the cam and change out the mounting screw or another option would be to print a drop-in replacement for the top plate. The existing plate is held in place with four screws.
- Once I thickened up the 10-Turn potentiometer base, had issues with screwing it into the base.
- The potentiometer uses a M8-0.75 thread.
- Not having that tap, completely destroyed one potentiometer trying to force it into the PLA holder.
- Now I heat up the PLA holder and busted up potentiometer threads and tap.
- The base still has enough flex to account for any misalignment's with the gears.
- Used existing screws from the unit.
- These screws are long enough to hold the new printed part and existing bottom plate in place.
- The pan gear slips/presses onto the fixed pan/mount base.
- Field testing
- Code Control
3d Parts and Design for above:
Tilt Pan Position Feedback for Bescor MP101 Video Motorized Pan Head
my zoom control:
Bescor MP101 Video Motorized Pan Head
WXD3-13 10K Ohm 2W 4 mm Shaft Diameter 10-Turn Wire Wound Potentiometer
Adafruit Panel Mount 10K potentiometer (Breadboard Friendly) (10K Linear) [ID:562]
Dual-axis XY Joystick Module For Arduino Joystick Module
these parts didn't work out:
B103 10K Ohm 5-Pin Dual Linear Dial Wheel Potentiometer
Cut your own gears with profile shift - OpenSCAD library
Bescor MP-101 Hack Part 1
Bescor MP-101 and Arduino v3.0
Hardware @ Lab
PJON - Arduino compatible Communications Bus System