550L Aquaponics system
A couple of months ago Dennis presented a course on building a desktop aquaponics course which was a demonstrator of the technology that turns fish food into organic vegetables and fresh fish.
Dennis was also featured on Let’s Talk Hack where he went into how Black Soldier Flies supplements an aquaponics system, to use kitchen waste as the food source for the fish! This adds a very interesting dimension, reducing total waste for a household.
Saturday, Dennis presented a course and system build on a large scale aquaponics system – the course consisted of a theory portion and then a build.
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:
Philip brought along his 3D printed Mini Quadroped (http://www.thingiverse.com/thing:38159) to H4H on Tuesday – it 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.”
Anyway, so Marcus made a short video of this little guy doing his thing which you can see after the break….