13 stories
·
0 followers

Telescopes: Refractor vs Reflector

7 Comments and 10 Shares
On the other hand, the refractor's limited light-gathering means it's unable to make out shadow people or the dark god Chernabog.
Read the whole story
Atrus
1367 days ago
reply
Well, there's still a mirror on the refractor too...
Share this story
Delete
6 public comments
kizilbash
1363 days ago
reply
So a refractor can see space vampires?
Arizona
mkalus
1367 days ago
reply
I like both. My refractor and my reflector.
iPhone: 49.287476,-123.142136
JayM
1367 days ago
reply
Heh
Atlanta, GA
Covarr
1367 days ago
reply
I'm more interested in a redactor, really useful for cleaning up mistakes in a light's output.
Moses Lake, WA
alt_text_bot
1367 days ago
reply
On the other hand, the refractor's limited light-gathering means it's unable to make out shadow people or the dark god Chernabog.
skittone
1364 days ago
Yay! Alt_text_bot, you're wonderful. Thank you.
saganfan
1367 days ago
reply
Next time a student asks me about what telescope they should buy I will show them this.

RUFS, an open source Arduino based robotic farm

1 Share

F30IJWFI13E9A2H.LARGE-600

Paul Langdon over at BLT Robotics wrote in to let us know about a cool open source project the vertical hydroponic farm, an instructables here:

We call our project RUFS, for Robotic Urban Farm System

  • A vertical hydroponic garden
    -Allowing for high density yields and shorter growth cycles
    -Reducing resource consumption – water, fertilizer and space
    -Labor saving – no weeds or soil to till
    -Higher consistency of crops with great tasting results
  • Maintained by micro-controllers (Raspberry Pi & Arduino)
    -Watering cycles – monitor and auto refill levels
    -Plant nutrients and pH – monitor and correct
    Temperature monitoring
    -Air Circulation & Lighting controls (for indoor operation)
  • Smart and Connected
    -Farm Controller App for smartphone, tablet and pc
    -Get notified when the system needs a refill
    -Alerts when something isn’t running as expected

Via the contact form.

Read the whole story
Atrus
2170 days ago
reply
Share this story
Delete

July 07, 2014

2 Comments and 9 Shares

Only a few discount tickets left for GaymerX, which is the only con I'm doing in 2014!
Read the whole story
Atrus
2302 days ago
reply
Share this story
Delete
2 public comments
llucax
2301 days ago
reply
Go fuck yourself.
Berlin
dmierkin
2302 days ago
reply
So true

FLUX 1440: A Highly Impractical but Awesome Clock

1 Comment and 4 Shares

clock

One our tipsters just sent us this great project — it’s a unique style of clock that we haven’t seen before. It was completed as part of what we think was a post-graduate program by [Felix Vorreiter]. This is FLUX 1440 (translated).

It uses 1200 meters of marked rope that is fed into the clock and strung between various pulleys and gears. Every second, the rope is moved 1.3cm. Every 57 seconds, the time is readable across the strands of rope — but only for 3 seconds. After that everything goes “back into the river”, a metaphor for chaos.

The explanation behind it is in German, but we’ve tried to piece together a general statement about the meaning behind it. Of course, we’d love if one of our German readers could provide a better translation!

FLUX 1440 displays time as a spatial dimension and counts the length of a day using a long segmented rope. The length of each minute is felt physically, as the viewer must wait as the shapes change until the current time reveals itself from the chaos of the markings.

Stick around for an extremely well produced video demonstrating it — it’s also in German, but we think you’ll be able to piece together the meaning.

[Thanks Matt!]


Filed under: clock hacks
Read the whole story
Atrus
2428 days ago
reply
Share this story
Delete

Hackaday Interview with Amal Graafstra, Creator of xNT Implant Chip

1 Share

Near Field Communication (NFC) enabled devices are starting to appear in our everyday lives. Shown in the picture above is the xNT (fundraiser warning), a 2mm x 12mm fully NFC Type 2 compliant 13.56MHz RFID tag encased in a cylindrical Schott 8625 bioglass ampule. It was created by [Amal Graafstra], who therefore aims to produce the world’s first NFC compliant RFID implant. The chip used is the NTAG203, which is (for the sake of simplicity) a 144bytes EEPROM with different protection features.

We can only start thinking of the different possibilities this chip will create in the near future, but also wonder which precedent this may set for future NFC enabled humans. Embedded after the break is the presentation video of xNT but also an interview I conducted with [Amal Graafstra], who has already been living for 8 years with RFID tags in each hand.

[Mathieu] First, we’d like to wish you all the best for your campaign, and it seems you’re already on the right path as you’ve just gotten $2k5 of your $8k goal on your first day.

[Amal] Thanks! We’re quite open about most of our R&D projects, and I know several people have been waiting for the xNT. They certainly came through at launch time. The tough part now will be to gather the remaining necessary backers, many of whom may be new to the entire concept of an implant.

[Mathieu] As mentioned in your video, you’ve been living with NFC chips in your left hand for 8 years now. Is it something you often ‘show’ to people, and what are their reactions?

[Amal] The chips I implanted back in 2005 are RFID technologies, but they are not NFC compliant, meaning they do not conform to NFC Forum standards. The xNT is the first NFC compliant implant available, which is why we’re so excited to see the campaign succeed! To answer your question though, most people don’t even know I have any RFID implants, and I don’t bother showing them off anymore. Most people find out when I use them to get into my home, or to access my datacenter or unlock my car. If they are paying attention, they will notice I don’t have anything in my hand and they will ask “hey, what just happened there” and I’ll show them and explain. When introduced to the concept in that way, seeing a useful application of it before contemplating the implant itself, most people are receptive and can see the usefulness. If I tell someone about it first, their reaction is usually a squeamish look on their face and sometimes a negative comment.

[Mathieu] Many of our geek friends at Hackaday are very interested by this technology, but are afraid to put it under their skin. What in your opinion could make them take this step?

[Amal] Back in 2005 I had several doctors as clients, and I consulted with both a cosmetic surgeon and my family general practice doctor about the device and the location I wanted to implant it. Both agreed it was a very safe place to install one of these devices, and both performed the procedure for me without hesitation. Since getting my implants, I’ve worked with hundreds of people also interested in getting an implant. I started Dangerous Things in order to control the materials processes involved to ensure the tags we sell are made with biocompatible glass and internal resins, and all components are bio-safe. Of all the people I’ve helped or sold implants to, I’ve never heard of any tags that have been implanted in the correct location (webbing of the hand) and in the proper orientation (parallel with the metacarpal) ever breaking or causing a problem. I’ve worked with doctors and body piercers to place these tags under the skin, and we’re building a partner network of professional body piercers to increase access to a clean studio environment and professional installation services. We offer procedure guides and phone consultations for piercing professionals who are installing for a Dangerous Things customer. Additionally, the implants are MRI safe, so getting one will not exclude you from medical imaging procedures.

[Mathieu] In your experience, are technical people less reluctant to try this chip than non-informed persons?

[Amal] Most of the time, people without a technical background will have misconceptions about the technology which lead them to believe that it is capable of doing something that it can’t. The most common misconception is that it can be tracked in real time by a 3rd party, like a GPS enabled device might be. Another common reason non-technical people are reluctant to entertain the idea of an implant is the lack of cheap, simple commercial products that work with the implant. When I got my first EM4102 based 125khz implant, the NFC standard was not published and there were no devices. This lack of standards meant you’d have to buy an expensive commercial access control system or you’d have to build solutions yourself. I ended up building my own solutions, as did many other hacker/hobbyists. The good news is, with NFC standards growing in popularity, commercial devices and systems based on NFC are now becoming available and a non-technical person can easily begin to integrate NFC into their daily lives without needing to solder it together themselves.

[Mathieu] The chip that you offer to put under the skin can be reprogrammed at will but has a unique 7 byte serial number, which may arise privacy concerns. What will you do with this information? Can we trust you? Do you think you’re setting a precedent in the history of NFC enabled humans?

[Amal] The 7 byte UID programmed into each NTAG203 chip could be a privacy concern if people used their tags with systems that are outside of their control. For example, if a person enrolled their implant with an access control system at their work or school, then every time they entered the premises by using their implant, that access even would be logged. But, the reality is, this is always the case when you use an access card, so there really is no difference having that access card under your skin instead of in your pocket.

The real question being asked about privacy revolves around consent – can someone read it, from a distance, without your consent. While it is technically possible someone could build a large, high powered antenna loop to pick up tags from a distance of a few feet, it’s not practical and not at all likely. Magnetically coupled data transmissions from passive tags don’t work like typical electric field radio emissions, and it becomes very difficult to generate a stable magnetic field that is large enough to envelope tags at a distance while maintaining the integrity and sensitivity required to communicate with those tags. Furthermore, the context in which you use your tag matters. If someone were to set up a large antenna loop somewhere and skim tag IDs of people walking by, in order to do anything with that information they would have to figure out who you were, how you used that tag ID, and plan an attack on you specifically. Unless a person were to use their implant to gain access to a bank vault or another target that an attacker would want to get into, it’s just not very likely. On the other hand, attackers who set up skim points to pull credit card data from RF enabled cards don’t need to know anything about their victims in order to go use that skimmed data to make purchases. Context matters.

[Mathieu] Did you try different antennas to see how far you could read the chip from?

[Amal] I’ve tried various antenna configurations with my 125KHz tag because low frequency works better than 13.56MHz high frequency tags when implanted into the body. The best range I could get using a high powered antenna loop coil that was 2 feet (~60cm) in diameter was about 1 foot (30cm). Typical read range of a 2mm x 12mm 125KHz tag using conventional readers is between 1mm and 2cm, depending on the reader and antenna configuration.

[Mathieu] In your opinion, can this chip be used to implement simple authentication on everyday devices?

[Amal] The xNT is well suited for simple authentication systems. The user memory space can also be used for NFC by storing an NDEF record, the latter portion of the user memory could also be used to store rotating one-time keys to help secure custom security systems. In a typical skim attack, an attacker that is able to read a tag’s UID bits and memory contents without consent would be able to emulate that UID and memory contents to the target reader device. In this scenario, the attacker gains entry and the victim has no idea anything is wrong. The attacker could come and go as they pleased without detection. By using a rotating key, each time the potential victim uses their tag the reader updates the key. This means two things; 1) the attacker has a very limited amount of time to utilize their attack. If the user were to return and use their tag before the attacker had time to execute an attack, the attack would fail. 2) the victim of a successful attack would not be allowed access due to a bad key on the tag. This would alert both the victim and the system administrator to a potential attack situation, which could bring up surveillance video of the current attempt and the last system access made by the attacker. Detecting an attack after it has happened is just as important as preventing one. Of course, there is no such thing as absolute security, and there are attacks which could be executed against a rotating key system, but again context is what matters. Typical users are going to be using the xNT for residential home access type projects, and I think if someone wants into your home that badly, they are much more likely to break a window or use some other, more conventional method.


Filed under: Crowd Funding, hardware, Interviews, wearable hacks
Read the whole story
Atrus
2532 days ago
reply
Share this story
Delete

Neo-Chassis ‘Minerva’

1 Share

A classic transhumanist pastime is designing our future cyborg bodies. Never as an excuse for being slothful in the present… but hey, some of us alive today will make it to the cyborg era, and we want to have our blueprints ready. The prerequisite technologies are being developed right now.

Some of the features we want to see:

  • Redundant, mechanical, higher-throughput organs
  • Organs that perform multiple important functions simultaneously
  • Artificial oculus with full-spectrum light sensitivity, telescopic vision
  • Carbon nanotube fiber muscles and tendons
  • Redundant power supplies, including ATP, petrochemicals, fuel cells
  • Mechanical cells with fullerene biomesh capable of quickly hardening
  • Nanocilia tactile sensors, self-cleaning skin
  • Gecko-style gripping skin, for walking on walls
  • Full freedom of rotation for joints
  • Aggregated diamond nanorods for the skeletal system
  • Deployable wings a la FusionManwith high tensile strength
  • Swarms of deployable nano-UAVsfor third-person vision and game-playing
  • Artificial gills for breathing underwater
  • Active skin that can become hydrodynamic for underwater movement
  • Systems for extracting water vapor from ambient air
  • Direct neural uplink via optogenetics or some other high-bandwidth interface
  • Chromatophores which permit quick color change and optical cloaking
  • Higher range of temperature tolerance: Luna to Saudi Arabia
  • Skin capable of manufacturing nutrients besides Vitamin D using sunlight
  • Deployable lorica segmentata for space or other extreme environments
  • Redundant nervous system with armored nerves, wireless backup
  • Fast-twitch muscles capable of extreme bursts of speed
  • Thermatophores for the generation of heat or cold
  • A heart based on redundant turbines instead of the 4-chamber model
  • Optical sensors around the body and a visual cortex to correlate it all
  • Small deployable lasers for reading/writing data or rangefinding
  • Internal holographic cubes for backing up all cognitive content
  • Mesh capable of being filled with air, for floating on water
  • Completely redesigned ear with full-frequency audio sensitivity
  • Solar cell skin for the option of obtaining full energy through sunlight
  • Photophores for emitting light, whether at night or in the deep ocean
  • Ultra-high-energy-density microbatteries for energy storage
  • “Lab-on-a-chip” capability for analyzing/processing unusual substances
  • electroplax cells for electromagnetic sensing and electricity generation*
  • *idea by PinkProgram

    Any others?

Any other ideas?

Read the whole story
Atrus
2635 days ago
reply
Share this story
Delete
Next Page of Stories