Cosmin Buhu
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Latest Activity

Cosmin Buhu replied to Kevin Hester's discussion Andropilot - discussion for Android ground controller users/developers
"This being asked, my proposed offline mapsforge inclusion would be a solution. Any news on this Kevin? "
May 22, 2013
Cosmin Buhu replied to Andrew Tridgell's discussion ArduPlane 2.72 released
"Hi, it was just in case you missed these details, I apologize if it sounded in other way. I was staring myself at some point at all servo PIDs being greyed out and wondering what's happening, fortunately I found the cause in a change in a…"
May 2, 2013
Cosmin Buhu replied to Andrew Tridgell's discussion ArduPlane 2.72 released
"Have you read this?"
May 2, 2013
Cosmin Buhu replied to Andrew Tridgell's discussion ArduPlane 2.71 released
"Correction: static void init_arm_switch(){     pinMode(ARM_SWITCH, INPUT);    digitalWrite(ARM_SWITCH, HIGH);     arm_watch_timer = millis(); } Hook the switch between A1 and GND."
Apr 25, 2013
Cosmin Buhu replied to Andrew Tridgell's discussion ArduPlane 2.71 released
"Better keep your things in your own separate files: File arm_switch.h: #define ARM_SWITCH A1#define ARM_SWITCH_DELAY 1000unsigned long arm_watch_timer; File arm_switch.ino: #include "arm_switch.h" static void…"
Apr 25, 2013
Cosmin Buhu replied to Andrew Tridgell's discussion ArduPlane 2.71 released
"Yes call read_arm_switch() in the fast loop."
Apr 25, 2013
Cosmin Buhu replied to Andrew Tridgell's discussion ArduPlane 2.71 released
"Not with 2 seconds activation but nevertheless how to sense a button: #define ARM_SWITCH A1#define ARM_SWITCH_DELAY 1000unsigned long arm_watch_timer;arm_watch_timer = millis();static void read_arm_switch(){    unsigned long now =…"
Apr 25, 2013
Cosmin Buhu replied to Kevin Hester's discussion Andropilot - discussion for Android ground controller users/developers
"Thanks Kevin for the latest version, I will test it today. Here are two picture with the AP box with manual controls, in case the tablet thinks to have a nap: Front panel with ON/OFF switch, ON/OFF LED, ARM button and LED, flight mode switch with…"
Apr 24, 2013
Cosmin Buhu replied to Joscht Laznyk's discussion Artificial horizon problem
"Me too, and used to be OK ?!"
Apr 23, 2013
Cosmin Buhu replied to Kevin Hester's discussion Andropilot - discussion for Android ground controller users/developers
"Bluetooth is working very well, I have my AP and andropilot connected with a BT Mate Silver: https://www.sparkfun.com/products/10393"
Apr 20, 2013
Cosmin Buhu replied to Kevin Hester's discussion Andropilot - discussion for Android ground controller users/developers
"Hi Kevin, here is the problem with the one-shot-goto-waypoint described in a post above: >>> I tried this however I think there is a problem in andropilot, it always sends the wp altitude set in settings, not the one typed in goto…"
Apr 18, 2013
Cosmin Buhu replied to Kevin Hester's discussion Andropilot - discussion for Android ground controller users/developers
"During today testings I had mixed and confusing results with (real) airplane Apollo Fox, Ardupilot and Andropilot, the latter being the most cooperative part. The Fox is a very twitchy airplane, it needs permanent rudder coordination even in level…"
Apr 18, 2013
Cosmin Buhu replied to Kevin Hester's discussion Andropilot - discussion for Android ground controller users/developers
"Hi Kevin, I tried this however I think there is a problem in andropilot, it always sends the wp altitude set in settings, not the one typed in goto procedure. Can you check? Your idea is of course the best to have programed or current wp altitude."
Apr 15, 2013
Cosmin Buhu replied to Kevin Hester's discussion Andropilot - discussion for Android ground controller users/developers
"Hi Kevin, I installed today the geared stepper motor for pitch axis and it was promising in flight tests, more powerful but I might need some more tune. Now the question (of course): what mavlink packet are you using for a single goto waypoint? I…"
Apr 11, 2013
Cosmin Buhu replied to Jared Reabow's discussion Idea! - Ardumega on a real airplane
"For example the Flight Design CTLS ultralight has 1.2 Nm stepper on roll which is less powerful than the 26 kgcm servo I use now. I reckon I intend to switch to steppers being more trusty for long term usage, but they add a new level of complexity…"
Apr 7, 2013
Cosmin Buhu replied to Kevin Hester's discussion Andropilot - discussion for Android ground controller users/developers
"I'm afraid I have no picture yet of the AP, but here is at least a plane exists: "
Apr 7, 2013

Profile Information

Please tell us a bit about your UAS 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:

http://store.diydrones.com/category_s/47.htm

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

https://www.sparkfun.com/products/10393

The control station software is a modified Copter-GCS:

http://code.google.com/p/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:

http://www.open.com.au/mikem/arduino/AccelStepper/index.html

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:

https://www.sparkfun.com/products/10735

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 :)

Regards,

Cosmin

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 great....no 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 difference...in how well the servo or in this case stepper....

T
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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