Portable, loud, and fashionable. Take a vintage suitcase and install a set of speakers, passive crossovers, an amplifier, and a couple of rechargeable batteries. Now you have a portable, albeit heavy, stereo that will make your ears bleed.
Some people may have known already about the temperature sensor built into the ATMEGA8, 168, 328 series microcontrollers, but the most serious enthusiast would write off the 1°C resolution as just a coarse sensor of no practical use. I would have to say I was part of that group, until I compared the response between the two sensors.
The TI LM35DZ is a simple temperature sensor that has an accuracy of +/-0.5°C at 25°C and with 0.08°C of self heating, this should be sufficient to demonstrate the rough nature of the ATMEGA328′s internal temperature when compared to dedicated external sensor. The TO-92′s have the best Thermal Reponses on the datasheets and are the cheapest. Connection is straight-forward, +5VDC, Vout and Gnd with Vout to the ATMEGA328′s PC0 (Arduino pin A0).
For the ATMEGA328 internal sensor, adjustment of the voltage offset can be used to calibrate to another sensor.
In this short vlog I go over the differences between Nixie tubes and Vacuum Florescent Displays. These displays often get lumped together but they are very different, and not to be confused with each other. I also give a nod to Dave Jones who is the current caretaker of the LVDC board. You can watch the Mailbag episode where Dave unboxes the board here.
David Kilpatrick from TXAustralia takes us on a detailed tour of the old decommissioned 10kW analog TV transmission system at the Artarmon facility in Sydney. It is still used to transmit digital TV. How it all works from the broadcaster video input to final transmission output up the 180m broadcast antenna. Plus some teardowns of the old equipment that’s been used to transmit the Channel 7 TV signal in Sydney since 1981.
Copper rigid coaxial lines, waveguides, filters, splitters, combiners, converters, transmission valve, power supplies and all the equipment necessary to transmit a 10kW analog or digital TV signal in a major city like Sydney.
I originally starting working on this device about the same time as the Sky65116power amplifier. The idea was that I should put a PA on the transmitter, and a low-noise amplifier (LNA) on the receiver. In this post, I’ll discuss the why and how of LNAs, as well as the construction and evaluation of the Sky65047 400MHz to 3GHz LNA board shown below. I’ve had these boards sitting on the bench for quite some time, and I finally got all the random-value passives that I needed gathered and the equipment necessary to measure it.
Sony has a new feel-good site and campaign – Artists & Engineers”. Good to see them celebrating art and engineering, maybe this is the start of focusing on great hardware and not being as adversarial with makers, hackers, artists engineers and entrepreneurs.
Popular X-box hacker and open-source hardware proponent Andrew “Bunnie” Huang is confirmed as a keynote speaker for EE Live!, featuring the Embedded Systems Conference, on Wednesday, April 2, at 9:30 am at the San Jose Convention Center.
Bunnie’s talk will focus on how open-source hardware can play a role in creating lasting value and user communities around new hardware platforms, the implications of the open-source hardware movement for traditional business models, and new opportunities for design engineers.
Famously known for his Xbox exploits, Bunnie is a strong advocate of open-source hardware and is an active contributor to the ecosystem.
An MIT graduate with a PhD in EE, Bunnie is currently a Research Affiliate with the MIT Media Lab and serves as a technical adviser for several startups. He also remains an active practicing engineer, with experience designing everything from nanophotonic silicon chips, wireless radios, and consumer electronics to robotic submarines.
In 2012 Bunnie received an Electronic Frontier Foundation Pioneer Award for his work in hardware hacking. Bunnie also will speak on his experiences manufacturing hardware in China at the Hardware Startup Engineering Summit at EE Live!, which takes place during EE Live! 2014, March 31–April 3, 2014.
The Shine by Misfit Wearables is an activity monitor that tracks your steps, general activity level, quality of sleep, and tells time. It uses bluetooth low energy (BTLE) to communicate to the (iOS only) app that helps you track your progress. And its waterproof! We wanted to open it up and see how it works. Check out more photos in the guide on the Adafruit Learning System.
While we have a good idea about how these things should work theoretically, it seemed about time to try erasing cards with some magnets. This article describes our test results with some cards and a card reader, and provides some guidelines about how to avoid erasing a credit card accidentally.
I’m probably unusual in that I find this world of cheap clone “shanzhai” hardware amazing. I’m fascinated that someone is out there redesigning existing silicon to make a knockoff that is smaller, cheaper but otherwise near-equivalent – to be used in devices that retail for less than $3.
I’d love to learn more about these secretive industries and the engineers who work in them.
How about you? Do you have any experience with dirt cheap hardware devices? How do you feel about shanzhai competing with regular firms’ R&D by cloning their hardware? Please leave a comment and let me know what you think.
The latest addition to our vintage collection is a Keithley 130A handheld DMM from the mid-eighties.Keithley is not well known for its handheld DMMs, or at least I’ve never heard of them. It’s a 3.5 digit 0.25% instrument made in mid 1980s.
It’s a dream of many hobbyists: turning their leisure pursuits into a lucrative business. That’s what happened for MIT alumna Limor Fried ’03, MEng ’05, whose pastime — tinkering with electronics — not only gave rise to a profitable company, but also positioned her as a leader of a technology revolution.
Since childhood, Fried has built, tweaked and otherwise modified (or “hacked”) electronic devices, sometimes creating her own unique gadgets. Eventually, at MIT and beyond, she would sell these products — while freely sharing their design plans online — through her startup, Adafruit Industries.
Today at the Chaos Computer Congress (30C3), xobs and I disclosed a finding that some SD cards contain vulnerabilities that allow arbitrary code execution — on the memory card itself. On the dark side, code execution on the memory card enables a class of MITM (man-in-the-middle) attacks, where the card seems to be behaving one way, but in fact it does something else. On the light side, it also enables the possibility for hardware enthusiasts to gain access to a very cheap and ubiquitous source of microcontrollers.