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markcra's designin' makin' and doin's diary of my exploits in digital fabrication, robots and other random hobbies that tickle my random fancy. menu skip to content home digital fabrication 3d printing cnc routing laser cut maklab glasgow open source hardware group arduino light painting arm robots background robosapien dissection photos connection table led hand mod brain photos hacking stage 1 hacking stage 2 hacking stage 3 hacking stage 3b: software robosapien circuit diagrams robosapien components robosapien ir codes robosapien v2 ir codes roboquad ir codes irobot roomba xi – a simple phototropic robot spanr photography diving about pizero dimensions leave a reply #pizero dimensions a photo posted by mark craig (@markcra) on nov 27, 2015 at 8:35am pst this entry was posted in raspberry pi and tagged #pizero , raspberry pi , raspberry pi zero on 29 november 2015 by markcra . tinyscreen 2 replies i backed the kickstart campaign for tinyscreen , which adds a colour oled display to the tinyduino platform, thinking this would make a neat badge for the maker faires. well it arrived just in time with edinburgh mini maker faire in two weeks followed by maker faire uk in newcastle the following weekend. continue reading → this entry was posted in arduino on 5 april 2015 by markcra . led cube 3 replies i’ve seen many led cube projects pop up on relevant blogs (hackaday and make blog to name two) and wanted to make my own but it never reached the top of my todo list until i recently started playing with the ws2812 rgb leds (more commonly known to some as neopixels). these delightful leds come in wonderfully small packages (i’m using the 5050 surface mount ones but i believe they are also available as through-hole 5mm leds). i made a spinning dodecahedron out of milled pcbs which was adorned with such leds ( read about that here ) and when i took delivery of the bare ws2812b leds, which only have four contacts (power, ground, data in and data out) i realised i could free-form them in a series of columns to create a cube. i expect this has probably been done before but as i was due to give a workshop on controlling leds with arduino i thought this would make an ideal example. click continue reading for details. continue reading → this entry was posted in arduino , laser cut , maklab on 16 november 2014 by markcra . quick arduino led clock leave a reply in two weeks i’ll be giving a workshop on controlling leds with arduino, where i hope to present ways in which the arduino can be used to control lots of leds though charlieplexing, ic controllers (such as the max7219 used for the clock face) and addressable leds such as the ws2812 (a strip of 24 such leds illuminates the seconds and hour position from the back of this clock). the clock was thrown together with what i had kicking around. the body comes from an old ikea clock (i’d bought it for the movement which went into a cnc cut lp clock ) with four 8×8 led matrices controlled by max7219s. behind that a strip of neopixels / ws2812 leds provides the seconds (red band) and hour position (blue pixel). the code could do with some work. it is based on the timeserial example provided with the time library and as such it needs to connect to a pc to set the time. i’ve ordered a real time clock (rtc) to aid in removing that dependancy. i might implement some sort of minute hand on the rgb leds, perhaps by lighting a few in another colour (and blending the colours as i have done when the second hand reaches the hour hand). the clock could be programmed to display a rainbow or larson scanner effect when the clock strikes an hour. i might add a light dependant resistor (ldr) to adjust the brightness of the leds to match ambient light levels. finishing off the face with something which will replace the scrap of cardboard used to hold the led matrices in place is about all i expect to do with this. this entry was posted in uncategorized on 19 october 2014 by markcra . what will you make – dodecahedron leave a reply an experiment with cnc milling pcbs turned into a window display piece with lights and motion. click through for more pictures and some details. continue reading → this entry was posted in arduino , cnc milling , maklab and tagged cnc milling , dodecahedron , imodela , isolation milling , make , maklab , neopixel , pcb milling , what , will , ws2812 , you on 6 october 2014 by markcra . hdmipi stand 1 reply i backed the kickstarter for hdmipi , a 9″ lcd designed for use with the raspberry pi. it didn’t take long to assemble thanks to a good video walk-through and although i had some teething troubles with a dry joint on the micro-usb power socket (fixed by reflowing the solder with hot air from a desoldering station) i have been reinvigorated in my interest in the raspberry pi. the first thing i needed to do with the hdmipi was to build a stand for it. i had elected for the black acrylic styling and since i happen to have some offcuts of 3mm black acrylic i was able to laser cut a matching stand at maklab. continue reading → this entry was posted in laser cut , maklab , raspberry pi and tagged hdmi , hdmipi , laser cut , lcd , raspberry pi on 30 september 2014 by markcra . a good days polargraphing leave a reply i first learned of polargraphing from either ollyr on letsmakerobots.com or from seeing sandy at the edinburgh mini maker faire in 2013 . when i recently realised that i had the necessary parts (minus a few of the cheaper components) to follow in the footsteps of sandy’s polargraph.co.uk build i downloaded the files and 3d printed some sprockets (on maklab’s ultimaker2) and laser cut motor mounts (my own design). today i finished that all off by making a crude pen gondola (clear cd, cardboard tube and screws/nuts/washers). the first print was of a vector produced by one of the maklab volunteers (i didn’t have anything prepared and was busy setting up the polargraph so it fell on the volunteers to produce a vector drawing). proven to be working the next logical step was to draw the maklab logo. in this picture you can see the two stepper motors mounted to the drawing board (acrylic mounts clamp to the board) and the arduino and motor driver shield are zip tied to the top. my laptop is on the right running the processing sketch, turning the vector drawings into gcode and sending them to the arduino. i downloaded svg spirograph (it was the first link for my google search) and promptly produced a spirograph (ideal for this setup since i don’t have a servo installed to lift the pen off the page). it was mesmerising to watch and drew some attention. i think it would be cool to add a “spirograph of the day” which automatically generates a new spirograph and draws them each day (same spirograph drawn all day whenever the paper is replaced and a button on a laptop pressed). time lapse of the plotter in action. unfortunately i forgot to take a photo of the finished spirograph. edit: added a servo to lift the pen off the page and got a photo including the finished spirograph from the previous saturday. produced another spirograph, this one looked better part-way through but looks messy now. timelapse at the end of this post shows it turn from good to great to messy. we wanted to try drawing a picture so i selected a photo from my flickr vectorised in inkscape and loaded into the polargraph software. the result was great. time lapse of this saturdays drawings: this entry was posted in maklab , robot on 10 may 2014 by markcra . minishift from arachnid labs 4 replies while at this year’s maker faire uk i picked up a minishift kit from arachnid labs. i had previously bought their circuit pattern cards which i make use of when teaching the intro to arduino workshop. i soldered up the kit in the evening i got back from newcastle using the instructional videos (a few non-intuitive elements such as orientation of the led array and remembering to put the screws in before the led array). i struck an obstacle when i tried

URL analysis for markcra.com

http://markcra.com/blog/?p=232
http://markcra.com/blog/?p=317#more-317
http://markcra.com/blog/?tag=make
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http://markcra.com/blog/?tag=ws2812
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http://markcra.com/blog/?m=201303
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maklab.co.uk
polargraph.co.uk
amazon.co.uk
labby.co.uk

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Domain Name: MARKCRA.COM
Registry Domain ID: 1020734085_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.PublicDomainRegistry.com
Registrar URL: http://www.publicdomainregistry.com
Updated Date: 2013-05-09T22:58:16Z
Creation Date: 2007-06-10T19:58:34Z
Registry Expiry Date: 2022-06-10T19:58:34Z
Registrar: PDR Ltd. d/b/a PublicDomainRegistry.com
Registrar IANA ID: 303
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: +1.2013775952
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: NS1.5YEARHOST.CO.UK
Name Server: NS2.5YEARHOST.CO.UK
DNSSEC: unsigned
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  REGISTRAR PDR Ltd. d/b/a PublicDomainRegistry.com

SERVERS

  SERVER com.whois-servers.net

  ARGS domain =markcra.com

  PORT 43

  TYPE domain

DOMAIN

  NAME markcra.com

  CHANGED 2013-05-09

  CREATED 2007-06-10

STATUS
clientTransferProhibited https://icann.org/epp#clientTransferProhibited

NSERVER

  NS1.5YEARHOST.CO.UK 81.27.85.4

  NS2.5YEARHOST.CO.UK 94.76.247.150

  REGISTERED yes

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