Tag Archives: adafruit

Kit Building Party Photos & Video

This weekend I hosted a post-Halloween kit building party at MightyOhm HQ.

Nine close friends built Conway’s Game of Life kits from Adafruit Industries.  This is my favorite kit for these kinds of workshops because it’s easy for beginners to complete in about 2 hours, and when everyone is done, you can wire all of the kits together to create one large cellular automata display.  The last time I helped people build this kit was at a Make:SF workshop at the TechShop in Menlo Park.

Here’s a timelapse video of the afternoon, shot with a Logitech QuickCam Vision Pro webcam on an Eee PC 4G running Booru Webcam 2.0.

The capture interval was 5 seconds.  I used Quicktime Pro to stitch the images together at 15fps and iMovie to add titles and music (Turbo Outrun by FRP from remix.kwed.org.)

I wore my Halloween costume for most of the afternoon.  What am I?  Most people on the streets of San Francisco had no idea…

Kit Building Party

Safety first!
Kit Building Party

Stuart was the first to finish his kit:
Kit Building Party

Soldering the kits together to form the matrix:
Kit Building Party

Nine happy kit-builders with the 3×3 matrix they created with their finished kits:
Kit Building Party

And lastly, a video of the 3×3 matrix in action:

Three people had little to no soldering experience at the beginning of the afternoon.  Everyone who came went home with a working kit.  Success!

Wifi Radio Cost Breakdown

Many people have asked me for a cost breakdown of my Wifi Radio project.  Well, here it is!

I added a link to possible sources for as many parts as I could.  However, there were a few things I scrounged from local surplus electronics stores and couldn’t easily find a good equivalent online.  I’m not expecting everyone to copy my design exactly (not everyone has a woodworking shop at their disposal), so use these numbers as a rough estimate only.

If you shop around you should be able to beat the listed prices on many items, so I see this as sort of a worst case scenario.

To flash the wireless router and create a minimal radio (with no user interface), you will need:

Total: $65.48

To make the LCD display and tuner interface, you’ll also need:

Total: $52.06

(This is on the high end, the interface can certainly be built for less by using scrounged/surplus components.)

To make the finished radio, add:

  • Volume and tune knobs – ~$2 @ HSC
  • Cool tuner knob$8.55
  • 5V/12V power supply brick – $10 @ Weird Stuff
  • 5-pin mini-DIN power connector – ~$3 @ HSC
  • Power switch – ~$1 @ HSC
  • Cheap set of PC speakers (gutted for the speakers and amplifier) – $5 @ Weird Stuff

Total: $29.55

Oh yeah, and I almost forgot…

  • An awesome friend named Tony with a full woodworking shop in his garage who will make you a killer wooden enclosure for free – $priceless

Grand total (excluding the box) – $147.09

If you take out the cost of the development tools, namely the FTDI cable and the USBtinyISP, the total comes out to $105 (without the box).

By scrounging materials and using parts from your junkbox you should be able to reduce that figure even more, but obviously the grand total hinges on what kind of enclosure you use.  Not everyone has a friend with serious woodworking skills willing to donate time and materials, but use this as an excuse to get creative.

I wanted a box that showcased the time and effort that I spent on the electronics inside, but that doesn’t mean an old boombox from the Salvation Army couldn’t work just as well.

When I first started this project, my goal was to keep the total parts cost under $100.  On paper, it looks like I came pretty close to that, thanks to the donated box and excluding the reusable development tools like the FTDI cable and AVR programmer.  To be honest, I probably spent twice that amount on spare power supplies, extra knobs, a second router to bring to NOTACON, and a bunch of other stuff that I didn’t end up using in the final project.  But I’m pretty ok with that.  I think this just highlights the fact that:

If you just want a Wifi Radio, it will always be cheaper to buy one off the shelf. But if you make your own, it will be infinitely more rewarding.

It certainly has been for me.  🙂