PiFace Control & Display Tear Down

PIFace4

[John's] currently working on a rather fun PiNoir & Santa Catcher Challenge, and one of the main components is a PiFace Control and Display, which allows you to use a Raspberry Pi without a keyboard or mouse. Curious to see how this module worked, [John] decided to do a tear down and find out!

Using a de-soldering tool he removed the 16×2 LCD which obstructs most of the components on the panel, which revealed a 16 bit SPI port expander from Microchip MCP23S17. He continued to examine components and checked values using a multimeter to come up with the following circuit diagram:

[Read more...]

Hackaday Links: February 23, 2014

hackaday-links-chain

You can pick up a tiny laser pointer on the cheap if you know where to look. But when it comes time to replace the multiple button cells that power it be prepared to clean our your wallet. [KB3WZZ] got around that with the cap from a ball-point pen. He drilled holes in the end plug of the pointer, and used wire and a plastic pen cap as a battery adapter. He’s powering it from USB, but now that you have wires exiting the case you can use any source you wish.

[Gerben] tipped us off about the trinket clone he built himself. It’s a tiny sliver of a PCB which he etched, populated with through-hole parts only, and finished off with some finger nail varnish to prevent shorting and corrosion. The solder-covered edge connector for USB was left unvarnished of course.

If you live in a college town you are probably quite used to seeing futon pads and frames on the curb waiting for the garbage collector. A little bit of ingenuity, and some added lumber, will turn a futon frame into a respectable shelving unit. [Thanks Martin]

Complicated bench equipment + good lighting + a great camera = an awesome teardown. This time around it’s the guts of a Keithly 2002 8.5 digit mulitimeter laid bare. [Thanks David]

Here’s a PCB laminator hack that is definitely worth a look. The original unit was acquired on eBay for about $25 and had a thermostat whose performance wasn’t optimal. A bit of alteration for the thickness of the substrate, and you’ll never hand iron a toner transfer board again! [Thanks William]

Last summer we heard about Scout, an ocean-going drone trying to cross the Atlantic. We just checked the live tracking and the craft is still at sea. But a much smaller 5ft vessel made it from New Jersey to Guernsey (an island between the UK and France) after traveling for about 14 months. [Thanks Rob]

Further Teardown of the Saturn V Flight Computer

Depotting LVDC Components

[Fran] has been working on tearing down and reverse engineering the Saturn V Launch Vehicle Digital Computer (LVDC). In her finale, she’s succeeded in depotting the legacy components while keeping them intact.

She accomplished this by carefully removing the silicone compound using a gum brush. This was a laborious process, but it allowed her to see the device’s innards. With this knowledge, she could recreate the logic modules on a breadboard.

[Fran]‘s work on the LVDC has been very interesting. It began with a look at the PCB, followed by an x-ray analysis. Next up was a three part series of the teardown. With each part is a detailed video on the progress.

While this is the end of [Fran]‘s work on the project, she will be handing off the LVDC hardware to another engineer to continue the analysis. We’re looking forward to seeing what comes out of this continued research.

Hackaday Links: December 1, 2013

hackaday-links-chain

Since our ‘ol buddy [Caleb] left Hackaday for EE Times, he’s been very busy. One of his latest projects is doing Antique Electronics Autopsies. This time around it’s a 1953 Heathkit Grid Dip Meter. It’s a beautiful piece of engineering with Point to Point wiring and metal gears.

We love microcontroller breakout boards, and so does [Tim] apparently. He built a breadboard friendly breakout for the NXP LPC812. It’s an ARM Cortex M0+ with 16kb of Flash and 4kb of SRAM. The entire breakout board is smaller than the through-hole DIP LPC1114. When are we going to see these on Tindie, [Tim]? Here’s the Git with the board files. You can also pick up a board at OSH Park - $3.30 for a set of three.

What do you do when you have the perfect idea for a Kickstarter, but don’t have the funds for the perfect sales pitch? The obvious solution is to start an Indiegogo campaign to raise funds for your Kickstarter. Unfortunately, this campaign has already been successfully funded, so it’s already too late to get in on the ground floor. Relevant xkcd.

We’ve seen this DIY cell phone before but now it’s just about ready for production. [David] at the MIT Media Lab has been working on a bare-bones, ATMega & GSM module phone for a while now, and now you can grab the firmware and board files. Make your own cell phone!

Here comes Hanukkah, so drink your gin and tonica. Here’s a pedal powered menorahica so put on your yarmulke, it’s time to celebrate Hanukkah.

Hackaday Links: November 10, 2013

hackaday-links-chain

[Henryk Gasperowicz], the wizard of electrons who makes LEDs glow for no apparent reason, has put up another one of his troll physics circuits. We have no idea how he does it (he does say he’s using wireless energy transmission) so a few solution videos would be cool, [Henryk].

Altoids tins make great electronic enclosures, but how about designing your PCBs to fit mint and gum containers? Here’s a Trident USBASP, a tiny Tic Tac ISP thingy, and a Mentos USB to JTAG interface.

By the end of this week, the PS4 will be out, along with the new PS4 camera. It’s a great camera – 1280×800 at 60Hz – but unless someone develops a driver for it, it shall forever remain tethered to a PS4. Luckily, there’s a project to develop a PS4 camera driver, so if you have some USB 3.0 experience, give it a shot.

Multimeter teardowns? [David]‘s got multimeter teardowns. It’s an HP 3455A, a huge bench top unit from the 80s. This is, or was, pro equipment and strange esoteric components definitely make a showing. ±0.01% resistors? Yep. Part two has some pics of the guts and a whole ton of logic.

The US Air Force Academy just moved their embedded systems course over to the MSP430. Course director [Capt Todd Branchflower] just put all the course materials online, with the notes, datasheets, and labs available on Github.

Inside The Clapper

clapper

Hackaday readers above a certain age will probably remember the fabulously faddish products developed by Joseph Enterprises. These odd gadgets included the Ove’ Glove, VCR Co-Pilot, the Creosote Sweeping Log, and Chia Pet (Cha-Cha-Cha-Chia) as mainstays of late night commercials, but none were as popular as The Clapper, everyone’s favorite sound-activated switch from the 1980s. [Richard] put up a great virtual teardown of The Clapper, that provides a lot of insight into how this magic relay box actually works, along with some historical context for the world The Clapper was introduced to.

Sound activated switches are nothing new, but the way The Clapper did it was just slightly brilliant. Instead of listening to every sound, the mic inside the magic box sends everything through a series of filters to come up with a very narrow bandpass filter centered around 2500 Hz. This trigger is analyzed by a SGS Thompson ST6210 microcontroller ( 4MHz, ~1kB ROM, 64 bytes of RAM, and 12 I/O pins ) to listen for two repeating triggers  within 200 milliseconds. The entire system – including the source code for the MCU – can be seen in the official patent, US5493618.

The Clapper sold many millions of units at a time when a lot of homes were assuredly in a pre-microelectronics world. Yes, in 1986, a lot of TVs had microcontrollers and maybe a washer/dryer combo may have had a few thousand transistors between them. Other than that, The Clapper was many household’s introduction to the ubiquitous computing power we see today, and all with less capability than an Arduino.

Tearing down an ultrasound machine from 1963

hehsiemens

Vintage electronics are awesome, and old medical devices doubly so. When [Murtaugh] got his hands on an old ultrasound machine, he knew he had to tear it apart. Even if he wasn’t able to bring it back to a functional state, the components inside make for great history lesson fifty years after being manufactured.

This very primitive ultrasound machine was sold by Siemens beginning in 1963 as a, “diagnostic ultrasound unit for the quick evaluation of cerebral hemorrhage after accidents.” This is barely into the era of transistors and judging from [Murtaugh]‘s teardown, nearly the entire device is made of vacuum tubes, capacitors, and resistors. The only solid state component in this piece of equipment is a bridge rectifier found in the power supply. Impressive stuff, even today.

In the end, [Murtaugh] decided this device wasn’t worth repairing. There were cracks all the way through a PCB, and he didn’t have any of the strange proprietary accessories anyway. Still, this junkyard score netted [Murtaugh] a bunch of old tubes and other components, as well as a nifty CRT that came with a wonderful ‘Made in West Germany’ label,.