Category Archive:

Flashing BLHeli firmware on DJI Opto 30A ESC’s


Bit more of a technical post – quadcopters (and many other electric rotors and vehicles) use brushless DC motors.¬† These act as three phase motors and in order to generate the required wavefroms, Electronic Speed Controls (ESC’s) are utilized.

DJI OPTO 30A ESC is quite popular for quadcopters and looks like this when you buy it:


While doing some research on these, I came across an article on fpvlab on how to improve the performance of DJI OPTO 30A speed controllers 

This sounded like a good way to learn more about ESC’s and I ended up compiling this short how to:

Posted in: Arduino, quadcopter

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Squiggles : a quadruped with attitude


Philip brought along his 3D printed Mini Quadroped ( to H4H on Tuesday Рit runs on 4x 1.2V NiMH batteries and can autonomously roam the room using ultra-sonic range sensors to avoid collisions.  It uses eight servos controlled by an Arduino Nano, so each leg has two axes of movement (2-DoF)!

Ok, so I had to look it up: “Quadrupedalism is a form of terrestrial locomotion in animals using four limbs or legs.”

2013-10-08 18.11.31

Anyway, so Marcus made a short video of this little guy doing his thing which you can see after the break….

Posted in: Arduino, Builds

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House4Hack visits Linden High School 2013 Geek Week


House4Hack joined Linden High School in Johannesburg for a day at their 2013 Geek Week. Post invitation from the resident Linden High Computer Class teacher, House4Hack moved into formation to create an interactive day outing which closely resembled lots of geeking out in a flash-mob style. One of the objectives was to foster curiosity under the students regarding technology and to expose the students to the concepts and openness of a Hackerspace.

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