For the Hackathon event last weekend, we wanted to build a robot and decided to go for a kiwi-drive.

The kiwi-drive is a three wheel drive configurations that use special wheels to achieve omnidirectional movement.

The robot was designed in Corel Draw (that’s what the laser cutter prefers) during the two weeks leading up to Hackathon and parts were purchased so that everything would be ready when the build started. We also moved the design from Corel Draw, via AutoCAD for cleanup, to SketchUp for a virtual test assembly and rendering to make sure everything would fit together.

The design was named KiwiRay, from kiwi-drive and stingray as the original design kind of looked like a stingray from above. Those design elements were later removed, but the motherboard mounting plate was shaped as a stingray instead.

The idea behind the platform was to create a design that uses only standard, easily available parts, so that anyone can reproduce it. The exception is the wheels from vexrobotics, but they can be replaced by any wheels of the same type. Other than that it uses an Arduino Uno, NEMA 23 motors, M5, M4 and M3 nuts and bolts and the chassis is cut from any 4mm material – plastic/plexiglass, wood or even metal. It can also easily be redisigned to support a wide variety of ball bearings and motors and has enough space to fit virtually any choice of motors, stepper drivers and even gear boxes if necessary

The Arduino provides a simple serial interface and does all of the required drive calculations. It also provides an add-on interface that can be accessed using the same serial link and allows up to over a hundred expansions to easily be added to the system. The first two addons will be a battery voltage monitor and an emoticon display.

The actual build went smoothly, all parts fit together nicely although some nuts turned out to be quite hard to get attached, prolonging the build time significantly. We didn’t get as far as we’d like, but the entire platform was assembled during the weekend and can now be controlled over a usb-connection that will be hooked up to the on-board computer once that is finished.

See our wiki page for the details.

Tagged with:

Max Peezay
IRK (All Out Dubstep)
Wilson Soto (Funk Of Fury, Carib)
Jesaja (Kärleksklubben, Cirkus)
Rob Love (Warriors)
Besh One (Den Roligaste Festen, Cirkus)
I&I (All Out Dubstep)
Amazing A (Dubstep Bastards)
Dj Octo (Underground Militia)

Två golv + live graff av NER crew. På Utkanten. 100:- i dörren. Facebook event.

EDIT: När datumet bokades så var det ingen fest dagen efter på lördagen. Nu visade det sig att Asylgruppen har sin födelsedagsfest (de fyller 20 år) på lördag som allså blir sista festen. Inträdet är minst 60:-, stöd gärna asylgruppen! Och de öppnar dörrarna 22!

We are hard at work, moving things to new sites. New locations, new futures!

Saturday and Sunday this week was spent cleaning and hauling stuff to a temporary storage. Much effort was spent, but it begins looking good up in the closing lab space at Utkanten.

On Tuesday, we will have a closing ceremony, a final Utkanten-based meetup. Same place, same time. We have a new home, and will continue our activity uninterrupted by the location swap.


I helgen var det HC-festival på Utkanten och nånstans där hittade några punkare vad de måste ha trott var en “punkdunk”. Såhär brukar nämligen punkarnas spritflaskor kunna se ut. T-blå är säkert vanligt groggvirke dessutom. Det är inte första gången det är punkspelning och någon försöker dricka av vår etsvätska men, snälla punkare, det är inte speciellt nyttigt att dricka natriumpersulfat. Dessutom är den använd och innehåller kopparsulfat.

Tyvärr förvarar vi ej längre drickbara lösningsmedel på forsken efter det tillslag länskriminalens samlade kompetens genomförde en novemberkväll 2009, då de lade rabarber på vår fina rom. Yarr! =(

Femton gastar på en död mans kista
Hej och hå å´ en flaska med rom!
Drick ty hin håle har sörjt för det sista
Hej och hå å´ en flaska med rom!

Det kanske bör tilläggas att flaskan förvarades i ett stängt skåp, luckan är trög dock antagligen inte låst, samt att utrymmet var off limits under festivalen.

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