Cosmin Buhu
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Please tell us a bit about your UAV interest
I'm in real planes mostly ... trying to adapt.

Comment Wall (6 comments)

At 11:04am on January 16, 2013, Tim uszuko said…
Mr Buhu.....if possible could you give me a list of part numbers you used on your autopilot including what kind of autopilot interface you used?

1. What is the torque on your stepper motor? When no voltage applied can you move controls or do you have a clutch assembly.

Any info appreciated..T
At 11:46am on January 16, 2013, Cosmin Buhu said…

Hi Tim,

I am using APM autopilot:

The autopilot is linking with Mavlink protocol over Bluetooth telemetry using BT Mate Silver module:

The control station software is a modified Copter-GCS:

Running on a 7 inch 4.0.3 Android tablet, Huawei Mediapad. I intend to progress it to a nice glass cockpit display mimic popular PFD/MFD but it's a long way, the autopilot function is the primary goal.

APM code is modified to run steppers motors using AccelStepper library:

I measured the forces needed to move plane's stick are around 10 kg so I suppose steppers with something around 2 Nm will suffice, I will drive them with BigEasy drivers:

Now I only have a smaller motor with BigEasy but any bigger will simply be a mater of physical replacement, being software and electrically similar.

I reckon my next big concerns are the mechanical issues with steppers mounting :)



At 12:00pm on January 16, 2013, Tim uszuko said…
I have my gps hooked up via Bluetooth and dual electronics to ipad plus I have a oil temp probe that works via Bluetooth.

I wonder if the Bluetooth configuration you have would create any interference? I need to get the frequencies.

Thank you for info..t
At 12:00pm on January 16, 2013, Cosmin Buhu said…

I forgot: in disarmed mode power voltage is removed from steppers which leaves them with no resistance to movements. Will be a good design to provide somewhere at the last connection a shear pin in the (highly improbable) event the stepper will block internally.

At 4:22pm on January 16, 2013, Tim uszuko said…
That is resistance without voltage. It is hard to see from picture but for pitch and roll this plane uses a side stick. It will be easy to fix a quick release pin in the event of a jam.

What lb/inch settings do you use for roll? Is the axis of rotation one inch...2...3. Can make a big how well the servo or in this case stepper....

At 1:56am on January 17, 2013, Cosmin Buhu said…

I said above, I will start with 2 Nm which is 17.7 lb/inch. Trio servos give 22.5 pounds of force with 1.6 inch arm radius, 36 pounds with 1 inch arm - they have more torque using internal gears.

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