On Saturday the Hackaday community turned out in force to try something new. The first Hackaday Unconference was held in three places at the same time, and I was in Chicago and was amazed at the turnout and variety of presentations. The image above sums up the concept quite well, everyone shows up ready to give an eight minute talk, but as a whole, no one knows what to expect. Well, we should have known to expect awesome and that’s what we got.
As usual, people are excellent… to one another and in adapting to the fluid nature of the day. Pumping Station: One, a renowned Hackerspace in the Avondale neighborhood near downtown Chicago, opened their doors for us. Not knowing how many people to expect we set up two presentation rooms with a third on deck just in case it was needed.
We just barely squeezed everyone in one room for the first track but ended up splitting into two for part of the day. Here you can see that second room filling up. Even so we still had a handful of presentations that didn’t get a chance to shine — we simply must do this again so they can have the chance and because I had such a great time!
Continue reading “The Think Tank At The Chicago Unconference”
[Michal Zalewski] has radiation on the brain. Why else would he gut a perfectly-horrible floor lamp, rebuild the entire thing with high-power RGB LEDs, and then drive it with a microcontroller that is connected up to a Geiger-Müller tube? Oh right, because it also looks very cool, and Geiger tubes are awesome.
If you’ve been putting off your own Geiger tube project, and we know you have, [Michal]’s detailed explanation of the driver circuit and building one from scratch should help get you off the couch. Since a Geiger tube needs 400 volts DC, some precautions are necessary here, and [Michal] builds a relatively safe inverter and also details a relatively safe way to test it.
The result is a nice piece of decor that simultaneously warns you of a nuclear disaster by flashing lights like crazy, or (hopefully) just makes a nice conversation piece. This is one of the cooler Geiger tube hacks we’ve seen since [Robert Hart] connected up eighteen Geiger tubes, and used them to detect the direction of incoming cosmic rays and use that to compose random music (YouTube, embedded below).
[Michal] is also author of the most excellent Guerrilla Guide to CNC Machining and keeps good tabs on his background radiation.
Continue reading “Mood Lamp Also Warns Of Nuclear Catastrophe”
[agp.cooper]’s son recently went to China, and the biggest complaint was the Great Firewall of China. A VPN is a viable option to get around the Great Firewall of China, but [agp] had a better idea: an acoustic coupler for his son’s iPhone.
Hackaday readers of a recent vintage might remember an old US Robotics modem that plugged into your computer and phone line, allowing you to access MySpace or Geocities. Yes, if someone picked up the phone, your connection would drop. Those of us with just a little more experience under our belts will remember the acoustic coupler modem — a cradle that held a phone handset that connected your computer (indirectly) to the phone line.
With a little bit of CNC work, [agp] quickly routed out a block of plywood that cradled his son’s iPhone. Add in a speaker and a microphone, and that’s an acoustic coupler. There’s not much to it, really. The real challenge is building a modem.
In the late 90s, there were dedicated chipsets for modems, and before that, there was a 74xx-series chip that was a 300-baud modem. [agp] isn’t using anything like that. He’s building a modem with an Arduino. This is a Bell 103A-compatible modem, allowing an iPhone to talk to a remote computer at 300 bits per second. This is a difficult challenge; we’re not able to get 33kbps over a smartphone voice connection simply because of the codecs used. However, with a little bit of work, [agp] managed to build a real modem with an Arduino.