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of moving the parts strictly in cartesian coordinates the printer works by moving shuttles on three vertical drive towers to achieve the movement of the print head in the standard x y z planes it makes for a solid design and also a very unique and fun looking build the mini kossel is an open source design originally created by johan rochel currently their aren t any places that sell completed kits for the kossel so it has a very active and welcoming community of users who have created one with their own twists and methods we decided to go with the standard mechanical build to start with that uses linear slide rails for the tower carriages the modable part i want to start working on is a touch screen interface for running the printer computer free i m toying with visualtft software from mikroelektronika and a pic32 mcu to drive the touchscreen and sd card reader we ll see where it goes if you re interested in building a mini kossel here are some links to start with mini kossel reprap wiki page make magazine review of the mini kossel prototype openbeam blog and parts builda3dprinter they offer build instructions and some parts kits deltabot printer google group updates hoepfully i ll be back to finishing my lego power functions tutorial soon i got sidetracked with the mini kossel coming soon finally here is a picture of a completed mini kossel from make magazine to see what we ll hopefully be ending up with posted in 3d printing mini kossel tagged 3d printer 3d printing building kossel mini kossel leave a reply lego pf hacking wire hacking posted on march 2 2014 by ihayes42 10 lego power functions hacking guide part 3 wire hacking part 1 introduction part 2 equipment part 3 wiring hacking part 4 wiring arduino coming soon its time to hack break out the wire cutters and soldering irons cause its about to get real step 1 grab your lego pf extension cables the first thing we will need to do is prepare our extension cables so that one end can be hooked up to our legos and the other can go in to a breadboard for attachment to arduino and motor controller lego pf extension wires top wire is hacked bottom is a normal wire before hacking as you can see in the picture above the extension wires have two different colored heads on them one light grey and one dark grey we re going to cut off the light grey end as close as possible to the plastic head to leave as much wire as we can side note the underside of the light grey end converts pf to old mindstorms motors which is why we are cutting off that end the goal is to achieve what you see with the top wire in the picture a lego connector on one end and bare wires on the other step 2 cut and strip the wires as mentioned above take your extension cable and cut light grey end off as close to the plastic as possible you should come out with the four wires that make up the cable all stuck together by their insulation now we need to prep the wires for use with a bread board separate then strip each wire the first thing is to separate each of the four wires from each other using a razor or utility knife to cut the areas between each wire s insulation the insulation is thin so you have to be careful to stay straight and not bite in to a wire i find this easiest by laying the blade edge flush with the area to be cut and then pushing straight down to do the cut all at once next you need to strip the separated wires of their insulation i used a wire stripper that can do 22 gauge stranded wire 20 gauge solid i highly recommend a wire stripper as seen in the picture as the wire is very small and stranded which makes it easy to cut off strands when doing it with a razor blade step 3 tin the wires and do it again for a second cable the final step is to tin the wire ends this means to use a soldering iron to apply a small amount of solder to the end and bind the strands all together this makes is much much easier to insert the wires in to a solder less breadboard for use with the arduino you should end up with an end that looks something like the picture below for help with tinning do a search on youtube as there are many examples we will need two of these cables so make sure you complete a wire in the exact same way wires tinned and ready for use step 4 know your wires congratulations you have two wires hacked and ready to go hopefully now we need to learn a little something about what each of the four wires does in the picture below i have labeled each of the four wires from the top view of the cable lego nubs facing up on the connector power functions cable showing the use of each wire power functions wires gnd ground wire always connected 0v regardless of battery pack direction c1 control wire 1 9v when battery pack is forward 0v when in reverse c2 control wire 2 0v when battery pack is forward 9v when in reverse 9v power wire on when battery pack is on 9v regardless of pack direction the two outside wires are our power and ground anytime a lego battery pack is connected and turned on these wires will be the same and do not change polarity the two inside wires are the motor control wires that power the motors themselves when a battery pack has its direction switch changed it reverses the polarity of these two when c1 is high and c2 is low the motors rotates forwards when c1 is low and c2 is high the motor rotates backwards if you have a pf infrared speed controller in your system the speed controller applies a pwm signal to c1 or c2 to regulate the speed step 5 our design what we are going to do is use one of our cables to draw power from the lego battery pack via the outside two wires and then use our second cable with the inside two wires to attach the pf motor to our motor controller stay tuned for how to wire this up with the arduino guide table of contents part 1 introduction part 2 equipment part 3 wiring hacking part 4 wiring arduino coming soon posted in lego hacking tagged arduino hacking lego lego series 1 power functions 10 replies lego pf hacking equipment posted on february 6 2014 by ihayes42 4 lego power functions hacking guide part 2 equipment part 1 introduction part 2 equipment part 3 wiring coming soon welcome to part 1 of my lego power functions hacking guide for those who skipped the intro post i m demonstrating how to hack lego power functions part of lego technic for control with your own microcontroller in this guide i will be using the arduino uno to control our legos to get started i m going to go over the things we will need as a part of this guide equipment shown 1 lego power functions medium motor 2 lego power functions 9v battery box 3 lego power functions extension cable 8 or 20 4 lego technic axel optional 5 arduino uno 6 arduino cc3000 wifi shield optional 7 breadboard jumper wires 8 dual motor driver drv8833 can be others 9 led and 330 ohm resistor 1 lego power function motor this is the standard lego motor with four wire connection it can be purchased as part of a kit link or separately link the large and xl motor options also work 2 lego power functions 9v battery box this is one of two power functions battery boxes both work just fine this one comes in the power functions kit linked above with the motor or can also be had separately link 3 lego pf extension cable these cables are what we are going to hack to connect to the arduino this lets us keep the motor in tact for standard lego builds these cables were originally designed to convert from older mindstorms connectors to the new pf connectors we ll be cutting of the mindstorms end you can find them here 8 link and 20 link 4 lego technic axel and gear optional things are always more fun when they do stuff right if you have some lego technic sets lying around go ahead and build something that moves in fun ways and connect it to the motor 5 arduino uno and solderless breadboard the brains of the operation the arduino uno is one of the most common microcontroller boards for hobbyists worldwide there are vasts amount of documentation and examples available all over the internet so you should have an easy time getting started if you haven t used one before the arduino uno and a solderless breadboard for wiring can be found at your local radio shack or also available online from adafruit both have started kits available that include extra components to help you get started if you re new to circuits 6 adafruit cc3000 wifi shield optional arduinos use add on boards called shields to add functionality to them as an optional addition to this guide series i ll show how to add wifi to your arduino using this shield so your lego robots can be controlled from a computer the shield can be found here link 7 wire jumpers to wire components together on a breadboard its always helpful to have jumper wires a set of these is each included in the starter packs from radio shack or adafruit you can also cut and strip the ends of your own 22 gauge wire to make some cheaply 8 motor driver drv8833 to control a motor you need large amounts of power more than a microcontroller can handle we use special motor driver chips to handle the motor current that can be controlled by a signal from the arduino there are numerous motor control shields available for the arduino but i like using external drivers since they can connect to any microcontroller out there this is a board from pololu and can be found here link 9 led and 330 ohm resistor optional i always add an led to my projects just for status information there is also an led built in to the arduino that can be used if it is not covered up by a shield 10 soldering iron what hobby workspace wouldn t be complete without a soldering iron you ll need one to tin some wires and attach the pins to many arduino shields i won t be getting in to a soldering tutorial but youtube is your friend my best advice is don t completely cheap out on a soldering iron if you can help it a variable temp iron from weller or hakko is a great choice both adafruit and radio shack will have these moving on got it all ok shopping list done time to move on to what most people are interested in and that is how to hack the power functions wires to connect them to our own circuits stay tuned as that s coming up in the next part of the series lego power functions hacking guide contents part 1 introduction part 2 equipment part 3 wiring coming soon posted in lego hacking tagged arduino hacking lego lego series 1 legos power functions robotics 4 replies new tools windows tablet and lightbox posted on february 3 2014 by ihayes42 reply new tools this past weekend i was able to pick up a windows 8 1 tablet and lightbox dell venue 11 pro dell venue 11 pro i bought a dell venue 11 pro from the microsoft store while i was in chicago for work related training it has the intel atom z3770 bay trail cpu and runs full windows 8 1 i m super excited about the venue 11 due to the fact that i now have a computer i can easily get out on crowded airplanes to do programming and design work on i love my 17 inch dell precision work laptop but at 8 lbs and as wide as it is it just isn t easy to work on from an airplane seat back tray table with limited elbow room the venue 11 pro should solve that problem for me and also allow me to mess with my designs while hanging out in the living room with the wife i m waiting for the keyboard trackpad dock to arrive in the mail this week which should allow it to function like a standard 11 laptop when the tablet is docked in it after only three days my first impressions are highly positive its super zippy for a mobile style processor and has run everything i ve thrown at it so far i have visual studio 2013 loaded on it along with the ides for arduino and mikroc all run like a champ it evens runs torchlight 2 for some real computer gaming on the go next step will be to load eagle cad and a 3d modelling package on it for 3d printing i m pretty confident those will run just fine as well it only has 64gb of storage space which is a little restricting but should be just enough i may need to start installing some applications on a usb 3 0 flash drive at some point http www dell com us p dell venue 11 pro pd oc ftcwd02h model_id dell venue 11 pro photography lightbox cowboy studio lightbox arduino in the lightbox my other pickup was a photography lightbox from a company called cowboy studio taking pictures on my desk don t always turn out the best so i m hoping this should make things a lot easier to see when trying to photograph details the premise being it makes an infinite white background as you can see i need to do some ironing of the cloth insert but i m pretty happy with how the picture of my arduino turned out i don t know that i ll use it for everything since i don t have a space where i can just leave it up all the time but it s handy for pictures i just can t get to turn out otherwise at only 12 it was hard to turn down light box at amazon com posted in uncategorized tagged dell light box tablet tools venue 11 pro windows windows 2 in 1 windows 8 1 windows tablet leave a reply lego power functions hacking intro posted on january 24 2014 by ihayes42 5 hacking legos seriously who doesn t like legos one of my current problems is how to get more people interested in microcontroller programming and robotics microcontrollers are cheap through the likes of the arduino but until you attach cool things to them they are quite boring left alone but how do you start someone going when the things you attach are complicated and often expensive legos few are the households that don t have access to standard legos add to that a lego power functions motor and gear kit which can be had for as cheap as 10 on ebay and you re up and running i ve started a project to hack lego motors for easy attachment to an arduino the benefits of this are two fold ease and low cost of lego robot platform building massive arduino code library and documentation availability from all over the internet my goal is to create a project anyone with legos and an arduino could put together to use as a robotics platform my plan is to start with simple motor control and move on to more advance control here are a few of my possible plans wire project with no destruction of lego motors or attached cables hacking extension cables for arduino connection basic motor speed control using arduino and cheap motor driver from pololu com remote control over arduino serial terminal remote control over wifi using cc3000 wifi shield for arduino from adafruit pc interface for wifi robot control using c android interface for wifi robot control possibly using basic4android we ll see 3d printed lego compatible mounting blocks for arduino entirely dependent on me getting a 3d printer hint watch this blog addition of webcam stream using raspberry pi or upcoming arduino tre some of these are stretch goals but you can never plan to big as long as you keep your priorities in order so here we go hopefully i ll have part 1 up soon which deals with starting equip...