Updates from December, 2013 Toggle Comment Threads | Keyboard Shortcuts

  • drahfa 8:19 am on December 30, 2013 Permalink | Reply  

    Propeller tersepit kat quadcopter arm 

    Rupa-rupanya ada sebab kenapa sambungan arm dan centerbase bagi frame DJI agak tenggelam. Rupa-rupanya untuk mengelakkan propeller tersangkut di bahagian sambungan apabila berlaku minor crash.

    20131230-161901.jpg

    Note to self: untuk rekabentuk arm yang baru, buat sedikit ‘mortice & tenon‘ connection supaya sambungan menjadi rata.

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  • drahfa 10:10 am on December 28, 2013 Permalink | Reply
    Tags: relax   

    20131228-180907.jpg

    Just a photo of a cup of coffee. I like coffee. That is all.

     
  • drahfa 2:41 am on December 21, 2013 Permalink | Reply
    Tags: ,   

    3D printing stuff: I built a working drone in 24 hours 

    Last week I manage to get some time off from markings, teaching classes and meetings. As a designer, I found that the more stressed I am, the more drive I got to build things.

    So armed with a caliper and an old ProEngineer CAD software, I manage to design from scratch a simple quadcopter frame. It is basically consist of a centerbase (I printed it twice), and an arm (I printed it 4 times).

    You can download the the STL files here:

    Scidrones 3D Printed Quad

    2013-12-16 12.17.11
    Pic above: the built drone, fresh from the 3D printer

    The motivation comes from my DJI F330 frame that broke due to a crash last few months ago as shown below. So I was thinking, well this is a good reason to custom-design my own simple frame. If it crash and broken, I’ll just print it again. So it makes the downtime shorter.

    2013-12-10 16.50.45
    Pic above: My broken quad

    So once my frame were printed, which took about 6 hours to complete (ABS material, 50% infill, on a FlashForge Replicator printer), I installed the control board (APM 2.5), the 20 amp electronic speed control (ESC), a 2200mah battery, four Gemfan 8×4.5 SF prop and four brushlesh motor (Prodrive 1200kV) on the frame.

    It took me another half an hour to upload the PIDs, checking the balance, trimming the cable-ties and whatnot before I test-fly it in my office.

    And it fly great! No wobblings, very light and fairly strong!

    Some flyers concern about the motors being hot due to enclosure, but this is a tough decision that I have to make. In my defense,
    1. I’ve tested the hover to the maximum battery-time capacity of 7 minutes and the motors only heated up to 63 celcius and the 7-minute ride is more than enough to cover UMT’s shoreline at the altitude of 600 metres.
    2. The battery and esc’s are cool and happy!

    Now the to-do’s!
    1. Design and build a simple camera-gimbal to stabilize my GoPro camera.
    2. Design and build a water- and sand-resistant enclosure for the motor and electronics.

    Next up, if I’m not in the office, I’m probably at the UMT coastal line to run aerial coastal monitoring. See you there!

     
    • hudy 7:34 pm on April 30, 2014 Permalink | Reply

      nice! … u make available the file. STL to download?

      • Dr. Ahmad Faisal Mohamad Ayob 6:46 am on May 5, 2014 Permalink | Reply

        Hi! Pardon I forgot! Here’s the download link. The post has been updated with the link as well.

  • drahfa 2:43 am on December 3, 2013 Permalink | Reply
    Tags: , marine robotics,   

    Tutorial Penerbangan SteadiDrone di Universiti Malaysia Terengganu 

    Pagi yang cerah dengan cuaca yang baik, kami melakukan Pre-flight Check, Simple Flight dan GPS-Hold Flight. Drone ini akan digunakan untuk membantu aktiviti Coastal Monitoring, Mining Exploration dan aktiviti-aktiviti lain yang berkaitan.

     
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