Hackaday Links: August 1, 2010

August 1, 2010 by Mike Szczys 25 Comments

PCB Group Orders

[Phil] wrote in to let us know about the DorkbotPDX group orders. The site makes group PCB orders until a cutoff date or the panel is full. You get three copies of your design with no setup fee for just $5/square inch including domestic postage. Not a bad price. We aren’t affiliated with them, but we’re always looking for board production options for hobbyists. BatchPCB is another popular one, and if you need help getting your design ready we’ve got your covered.

Aspire One MAME cabinet

[Tim] built a MAME cabinet using foam board and some USB peripherals. Inside you’ll find an Acer Aspire One netbook. This build is quick, cheap, and if you get tired of it you won’t feel you’re stuck with it in the way owners of other MAME cabinet builds might.

Embedded Cake

If you are an embedded programmer who happens to be marrying another embedded programmer take note. This wedding cake is perfect for you; decorated with character LCD screens, solderless breadboards, and development boards along with the wires that connect them all together. [Francirius], a read from Chile, says this cake was the handy work of [Paulina Verdejo].

Scoreboard From Scratch

July 30, 2010 by Mike Szczys 22 Comments

[Kenneth] built this scoreboard for use at a ballpark that lacks such luxuries. We think this a phenomenal application for his skill and his pocketbook. He laid out PCBs for each digit in Eagle and etched them himself, then installed the indicators for home score, visitor score, inning, balls, strikes, and outs in a laser cut case. A pretty beefy battery along with the folding stand make this quite portable.

In the demo video after the break he’s connected to the scoreboard via telnet to update the score. This trick is accomplished using SparkFun’s WiFly GSX breakout board to set up an adhoc wireless network. The goal is to write an iPhone app that will be used to control the board in the field (or the outfield as it were).

This could definitely be used for different types of scoring during the off season.

Continue reading “Scoreboard From Scratch” →

Nixie Sudoku: A Look At The Hardware

July 19, 2010 by Mike Szczys 8 Comments

We’re always happy to receive a tour of the guts that make things work. [John Sarik] posted several pictures and descriptions of the hardware that makes up his Nixie Sudoku build. The modular design uses professionally made circuit boards which greatly improve the durability of a large set of circuits such as this.

The design draws on good ideas from similar hardware. The Nixie Duo kit from Ogi Lumen allows tubes to be mounted on top of driver boards with cascading shift registers for control of up to 8 tubes. The ArduiNIX shield makes the high voltages needed for Nixies easy to control with an Arduino. No, [John] didn’t just order these kits and plug them into each other. He designed his own boards to suit his needs. Each driver board can control 9 tubes in a 3×3 grid, all on one PCB. His high voltage board can supply enough juice for the whole system which is tied together with a single Arduino board.

His writeup is quite interesting so do take a look. He also filmed a walk through video which we’ve embedded after the break. It clears up some questions, such as showing the use of a blinking decimal point to indicate the current cursor position.

Continue reading “Nixie Sudoku: A Look At The Hardware” →

Make Your Own Toner Transfer Paper

July 12, 2010 by Jakob Griffith 17 Comments

Who would have thought that some corn starch could be made into toner transfer paper? We’re not sure of the advantages (perhaps its cheaper?), but if you have a lot of time or just love to get sticky [Matthew Sager] shows the proper method for making the paper, printing, and then etching a PCB.

If you’re just getting started making PCBs, we recommend you check out these DIY circuit etching videos to get a better grasp on the printing and etching steps.

Preparing Your PCB Design For Manufacture

June 15, 2010 by Mike Szczys 31 Comments

[Colin] has cut his teeth with about fifteen PCB orders. He wrote a tutorial describing the process and sharing his tips on avoiding common problems. You may remember our own How-To prepare designs for manufacture early last year. In that post, [Ian] shared his veteran knowledge by outlining BatchPCB’s board design process. This time, [Colin] is using Advanced Circuits in Colorado as a board house, giving us more insight on how the different companies work. No matter who you choose for manufacturing, make sure you really understand how to properly format and troubleshoot your designs. It’ll end up saving you a lot of time and money.

Brighten Up Your PCB Drilling Station

May 30, 2010 by Mike Szczys 15 Comments

Being able to see what you’re doing can be the hardest part of drilling the through holes in those freshly etched printed circuit boards. We don’t know why we didn’t come up with this, but [Markus Gebhard] solved his shadowy woes with his 20-LED Dremel light ring. Honestly, how many times have we seen lights rings in photography without putting it together that a light ring is perfect for this purpose. So kudos to [Markus], now we’ve got to go and dig up some surface mount LEDs and uncork the copper chloride.

Minimalist AVR Programmer Is Just Fab!

May 15, 2010 by Phil Burgess 62 Comments

Whether you’re burning a new bootloader to an Arduino board, or doing away with a bootloader to flash Atmel chips directly, an in-system programmer (ISP) is an indispensable tool for working with AVR microcontrollers. If cost has held you back, it’s no longer an excuse: FabISP is a barebones USB-based AVR programmer that can be pieced together for about ten bucks.

FabISP was created by [David Mellis] as a product of MIT’s Fab Lab program, which provides schools with access to design and manufacturing tools based around a core set of fabrication capabilities, so labs around the world can share results. But the FabISP design is simple enough that you don’t need a whole fab lab. It’s a small, single-sided board with no drilling required; the parts are all surface-mounted, but not so fine-pitched as to require reflow soldering. Easy!

There’s still the bootstrap problem, of course: you need an AVR programmer to get the firmware onto the FabISP. This would be an excellent group project for a hackerspace, club or school: if one person can provide the initial programmer to flash several boards, each member could etch and assemble their own, have it programmed, then take these out into the world to help create more. We must repeat!

[Thanks Juan]