Internet

July 19th, 2010

The space is now equipped with (sort of) high-speed broadband, so we’re no longer breathing through the drinking straw of a dialup-speed Unwired modem.

Installing the ADSL was an Adventure™. For starters, I had to wake up at 6.30am to get to the space by 8am, which was when TPG said was the earliest time the engineer might reach the house. I arrived with coffee and Subway cookies, and looked around for the phone socket.

Um. There wasn’t one.

I peered around the front of the house, and saw aerial cables from the nearby telephone pole (which I later found out were completely irrelevant — Foxtel or Optus cables). 15 minutes of searching for a torch later, I ventured under the house with a floodlight (overkill is what we do!). I traced the aerial cables to cables under the house (my hair collected about 40% of the cobwebs off the beams). There’s a 4-wire cable, but it’s been cut. Ugh.

Floodlight underneath the house

Half an hour later, the TPG guy shows up and crawls under the house with me to look for the cable. Eventually we found it, poking up into the board room with no socket on the end. He tests it, and to his great surprise (and my relief) it works. Clearly the line hadn’t been used for years, and for it to still be connected and working all the way through to the exchange is a small miracle.

TPG guy testing the connection

Somewhere in the junk room a Netgear modem was found, and a 12V/1A power brick stolen from the Linksys router. The modem was configured, and Internet was had.

And there were megabytes.

The Netgear modem

No longer will hackerspace-goers be plagued by the lack of data or the irritatingly long wait for Youtube videos! No longer shall we resort to our variously crappy 3G connections! At last, we are free!

Guide to Steampunking

May 9th, 2010

Kathryn and I have spent the last couple of weeks in the lead up to our Steampunk Gear workshop compiling a document for people getting started with (what I hesitate to verb) Steampunking on a budget. We’ve started with a few images to inspire you, and we’ll be filling out the document with more techniques and ideas as we think of and/or research them. If you see something in your travels that you think should be included, don’t hesitate to add them to the wave (or if you don’t have wave, contact either Kathryn <secretary@robodino.org> or me <jeremy@robodino.org>).

Without further ado:


Robots and Dinosaurs — A Hackerspace, Mini Documentary

May 2nd, 2010

A while ago we were visited by some student filmmakers who wanted to do a documentary on Robots and Dinosaurs for their Uni project.

It’s just got back, and (in addition to being awarded a high distinction) they’ve kindly allowed us to post it on the net.

Robots And Dinosaurs — A Hackerspace Documentary

Big thanks to Lucy, Doug, Hamish & Edwina for promoting our group for us. :)

Arduino Cheat Sheet V.02

April 22nd, 2010

I really love cheat sheets. In a lot of cases they can take the place of an entire manual. So I was surprised, given its popularity that I couldn’t find a single-page reference for the arduino online.

I tried to make a sheet that captured all the things I hit the reference for while programming. What data type does the millis() function return? How long till that overflows again? How large can a long get? What baud rates can the serial handle?

Any other things you’d like to see added, send me an email and I’ll stick them on Rev 3!

Edit: Just did some minor mods suggested by people. Here’s V.02b

Small version. Use PDF for printing purposes

Arduino cheet sheet v02b (PDF)

Editable visio version on my website:

http://sites.google.com/site/mechatronicsguy/arduinocheatsheet

Rocket Car Day! Photos and Vids

April 12th, 2010

For those of you that haven’t been following, we attended Rocket Car Day 2010 on the weekend. This is an event where everyone cobbles/crafts/hacks together the most baddass vehicle they can, then crams a rocket engine into the back and competes for honor and glory!

Some people spent a lot of time on their cars:

K9 hero shot

Others less so:

The K-t event

Unsurprisingly at such a geeky event, RnD members were there in full force. We even had our own race!

(Note the swanky new lab coats, with RnD embroidery )

The RND possee and their cars

Here’s a couple of videos of the cars:

Sorry for squealing at the end of the vid, but I really wasn’t expecting to win against those other cars which were, frankly, better than mine :)

Special shout out to Big (Iain) who made his own custom arduino & digital compass powered car! We were all sorry to see it was short lived.

Big's guided car

Beco Blocks, the 3d printable, snap together, ball and socket based building blocks.

March 8th, 2010

Initially created as a prototype for another ball and socket based project, these blocks functioned so well I decided to make a number of variations to allow the creation of more complex objects.

Beco blocks are great as toys and i suspect might also find practical applications for things like:

  • Light duty hinges.
  • Printable helping hands
  • Internal skeletons for soft toys.
  • Snap together bracelets.
  • Mini pose-able art mannequin

Beco blocks thus far have been printed on our Makerbot using ABS plastic. The first Beco block printed was very lonely, being the only Beco block in existence with no friends to snap together with. Some time later when I finally learnt how to use the Makerbot myself I started printing more, and was surprised to discover how effectively they clicked together. There were practically no design iterations in making the original male-female Beco block, i was just very lucky with a ball and socket size ratio which seems ideal.

The 3d models for Beco blocks include struts which allow the printing of the ball in a horizontal orientation. The struts can quickly and easily be clipped off using light wire cutters.

There is plenty of room for improvement in the design and additional brick variations. I have only designed enough types of bricks to build a basic figure so i hope others add to the collection.

The STL files are available at Thingiverse here: http://www.thingiverse.com/thing:1983

Tinkering — November 14th

November 14th, 2009

More tinkering again this Saturday.

  • We built a hot-wire foam cutter for the space, which should come in handy with our upcoming drumkit workshop.
  • Playing around with the BlueBoards we got. Congrats to Kean for solving the downloading problem.

Congrats to everyone for pledging for our new CNC Machine! We’ve reached our target in under 24 hours! I’ll put in the order tonight, and we’ll get this beast to us ASAP.

Robots and Dinosaurs Halloween Party & Movie Night

November 1st, 2009

This Saturday we had our Halloween party and movie night.

We started off with talks on Iphone Programming, CNC machining and more.  We’ll continue these talks in future for all sorts of topics, so stay tuned.

As an Australian tradition, in lieu of Pumpkins, we had Mellon carving!

Watermellon Carving

Watermellon Carving

We’ve also got some more pictures up here:

http://www.flickr.com/groups/robotsanddinosaurs/

Tinkering — October 24th

October 28th, 2009

Had our usual weekend tinkering this Saturday.

Breaking News: We got our own Slurpee machine!

Some highlights:

  • Got a slurpee machine!
  • SuperProbe manufacture
  • Making the DSO kits we group-ordered
  • Made a prototype drumkit for future workshop stuff
  • Juggling & Poi practice

Superprobe

October 3rd, 2009

I came across the Super Probe two weeks ago, and just had to make one.  I had a bunch of the PIC 16F870 microcontrollers left over from an earlier project, and the rest of the parts were all easily found in my parts collection.

superprobe1

It is a really simple circuit, with so many useful features:

- Logic Probe (L < 0.8 V, H > 3.7 V, P > 0.5us pulse)

- Logic Pulser (0.5 us pulses at 5, 50, 500, 5k Hz)

- Frequency Counter (8 digits)

- Pulse Counter (8 digits)

- Voltmeter (max 5 V, readings are a little high)

- Diode measurement (measures fwd voltage using 5V supply via 10k resistor)

- Capacitance measurement (1nF to 500uF, approx 100pF resolution)

- Inductance measurement (100uH to 999.99mH, but not very accurate)

- Signal generator (0.5 V square ware @ 500 Hz)

- NTSC video generator (white dot pattern)

- ASCII test pattern (A-Z then CR/LF at 1200, 2400, 4800, or 9600 baud)

- Midi test output (plays middle C on selected midi channel)

- R/C servo test output (approx 770 to 2300 us pulses @ ~28 Hz for servo control)

- Square wave output (1 to 9999 Hz 5V square wave)

- Pseudo random output (10 kHz PRNG)

- IR test output (38 kHz 50 % duty cycle square wave for IR receiver testing)

- PWM test output (6 kHz square wave with 3 % to 97 % adjustable duty cycle)

In addition to the PIC, you just need 4 common anode 7-seg LED  displays, a 20 MHz crystal, and a few resistors, caps, etc.

I found the display to be a bit dim, but the MAN6610 7-seg displays I used were quite old and would be rated quite low in brightness.  I left off the LM2931 regulator as I will just power it off 5 V, and so I actually put a PIC ICSP connector on the end of the board for re-programming, and an easy way to connect power.

We are looking to make up a PCB for this so that members can make their own.  It is a bit of a pain wiring up the 7-seg LED’s (using the LTC4627 would help a lot).

- Kean