My First PCB

Circuit BoardsI have received my first printed circuit boards from OSH Park. They look great and I am looking forward to trying them out.

I have designed my own circuits, prototyped them on breadboards and soldered them onto protoboard before, but I really wanted to take the next step and produce a real PCB.

12V LED Dimmer

The PCB circuit is a dimmer control for a 12V LED lighting strip. It provides three means of control:

  1. Buttons on the device
  2. An IR remote control
  3. XBee from a computer

I thought I would make my first boards using through the hole components, but I would like to try surface mount next.

OSH Park ordering experience

These are double sided 2″ by 2″ boards and three boards cost me $19.95 including shipping. OSH Park charge $5 per square inch for three and you can order as many boards as you like, as long as they are in multiples of three.

I ordered the boards and received an email the same day indicating that they were awaiting panelization. OSH Park takes small orders, from Makers like you and me, and groups them together to fill an 18″ x 24″ PCB fabrication panel. When they fill up a panel they send the design file off to the fabricator to be manufactured.

Two days later I received another email telling me that the panel had been sent to the manufacture and they expected to get it back in four days. They even mentioned that there were 36 other orders on the panel and a total of 294 boards.

Three days later they told me that the panel had arrived back from the fabricator and that they expected them to be depanelled and shipped within 48 hours. The panel contains lots of boards connected together by little tabs with three small holes on each side. This enables the individual boards to be broken off the panel. If you look at the picture of my boards you can see some of the tags still attached.

Seven minutes later I received an email telling me that my boards had been shipped. That email included a USPS tracking number.

Two days later a padded envelope containing the boards arrived at my house. So it took seven days from the date that I ordered the boards for them to arrive.

I think that’s pretty awesome price ($19.95) and turnaround time (7 days) for three custom PCBs. As a comparison if I ordered three 2″ x 2″ protoboards from SparkFun they would cost me $15.71 including economy shipping. And it’s nice getting frequent updates on where your board is in the process.

I have shared the board here on OSH Park.

Designing a board

I designed the board using an application called Eagle. CadSoft the company that make Eagle are generous enough to make a freeware version available which is very popular with Makers. You can download it from:

http://www.cadsoftusa.com/download-eagle/

The free version limits your schematic to a single sheet and your board size to 4″ x 3.2″, but that is more than good enough for most Makers.

Eagle takes a bit of getting used to as it is mode based: click to add a component and you’re stuck adding components to your board until you select a different mode from the toolbox on the left. But it’s worth investing in learning it as it opens up a whole new world of possibilities.

There are other circuit board design applications out there, but Eagle is one of the most popular. Also OSH Park will allow you to upload your Eagle files directly, which is nice for a first timer as it cuts out the step of generating Gerber files.

So now I need to find the time to solder some components to the board, with nearly one hundred holes on this board, it might take me a while!

Mini maker faire coming to a Barnes & Noble near you

Barnes & Noble Maker FaireMainstream retail meets the maker revolution.

So this is interesting news, Barnes & Noble are hosting a mini maker faire in every one of their 650 retail stores between Friday November 6th and Sunday November 8th 2015.

You can find out more from the announcement on their blog. The schedule is now available on the makerfaire.com site.

Maker Faires are family friendly show and tell events where Makers come to share what they have made and what they have learned. They take me back to the 1985 Alexandra Palace personal computer show where Clive Sinclair announced his C5 electric car.

The big Maker Faires in the Bay Area and New York drew 215,000 visitors last year and there were 119 mini Maker Faires last year. There is a mini Maker Faire in Seattle next week. But this is the first synchronized national event like this.

It will be interesting to see the maker movement meeting mainstream retail, if you are a maker spread the word and visit a local Barnes and Noble mini maker faire. You could even sign up as a presenter.

If you are interested in becoming a maker, take this opportunity to see what it is about at a local Barnes and Noble store.

Good fun and good business

This will be a fun event for the maker movement, but with magazine sales down and brick and mortar book sellers struggling to survive, this is serious business for Barnes & Noble.

Hosting in store events is an interesting strategy as it leverages their high street presence in a way that an online bookseller can’t replicate. And it gets people excited about a topic and open to buying books and kits from the store.

Personally I like the broad choice of books at Amazon.com and the instant gratification of downloading a book to my Kindle or an audio book to my Audible player. I am intrigued by the idea of a brick and mortar store offering something more social, but I wonder how that will translate to me spending more money at Barnes & Noble over the long term.

Becoming Maker

microchipAs a kid I was driven to understand how things worked. I deconstructed toys, unsoldered components from old car radios, disassembled and reassembled hifi stereo systems and learnt how to program High Street store VCRs.

My interest in electronics led to me doing a correspondence course where I built an oscilloscope from scratch. Then the microcomputer revolution came along and I was hooked, learning basic and Z80 assembly on a ZX80, and selling software in the computer magazine classifieds.

Back then computers were simple enough that you could know them inside out – you could buy a complete ROM disassembly in a book.

As my interest in computers led to a computer science degree and a software engineering career things got more complicated and things moved further and further away from those early tinkerer days. Operating Systems became huge, ecosystems became complicated and new development frameworks were being released every day. Now half of the software you use isn’t even running on the machine under your fingers, it is running in the cloud somewhere.

Then a second revolution came along, the maker revolution. Laser cutters, CNCs and 3D printers made it possible for individuals to convert digital designs into physical objects. Microcontrollers moved from being devices only accessible to embedded systems engineers to something school kids could program. And a community, supported by thousands of online how-to posts evolved.

Those microcontrollers filled me with nostalgia for the microcomputers of my youth, small simple devices that you could understand inside out. With their I/O headers and communication interfaces they begged to be connected to things, embedded in things, they begged to be used in new and creative ways. And they were small, so very, very small and ridiculously cheap – I could buy a microcontroller for less than a cup of coffee and hold one on the tip of my finger.

This was another revolution I had to join – I had to become a maker.