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44 items tagged "logic"
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7:01
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Hack a Day
Sooner or later, you’re going to need a logic analyzer. If you don’t have a Bus Pirate or Logic Sniffer lying around, [Joonas] has a great MacGyverism that turns an oscilloscope into the simplest logic analyzer ever. The basic premise of the build is tying four digital lines to the analog input of an oscope. This [...]
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16:01
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Hack a Day
[Kyle] has been hard at working building an 8-bit computer from the ground up. He’s using a set of logic IC’s for the various components, and some NVRAM chips to store the control words. What you see above is the roadmap for his instruction set. He’s just started writing them to the chips, making the [...]
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9:01
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Hack a Day
Late last week, we saw a rather clever combination lock build that used only a single 74xx logic chip. [J. Peterson] read this post, and in a battle royale of geek one upmanship sent us a write up of the logic chip computer he built nearly 30 years ago at the University of Utah. Around 1982 or [...]
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8:01
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Hack a Day
The component gods must have smiled on [Darrell], because he recently ran into a cabinet full of 7400-series logic chips for sale at his local college surplus. All the regulars were there – flip-flops, logic gates, and SRAMs – in DIP packages. the 7400-series of logic chips gets very esoteric as the numbers increased, so [...]
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12:49
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Hack a Day
[Fernando] wrote in to share his take on building a logic analyzer. He’s using the parallel port to capture data and feed it to the display software of your choice. The method depends on a custom kernel which alters the way the parallel port works. The kernel he compiled includes a method of intercepting the [...]
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12:01
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Hack a Day
While function generators or analog signal generators are ubiquitous in their utility, we haven’t seen much of logic function generators on Hack a Day. Luckily, [Dilshan] sent in a really neat 8-channel signal injector that is amazingly simple to build and comes with a great front end for editing patterns from your computer. The hardware portion of [...]
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11:01
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Hack a Day
If you’re just getting into hobby electronics chances are there are lots of tools you’d like to get you hands on but can’t yet justify the purchases. Why not build some of the simpler ones? Here’s a great example of a 4-channel logic analyzer that can be your next project and will add to your [...]
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8:01
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Hack a Day
[Andrea] built this LED chaser using one logic chip. It illuminates all but one of the six LEDs, with the dim bit moving back and forth along the row in a chase sequence. This is something like an inverse Larson Scanner without the fading tail. But doing it with a logic chip instead of a [...]
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10:04
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Hack a Day
We’re not going to question the logic that went into putting racing stripes on a slow cooker, but [Evan]‘s sous vide machine is the most professional one we’ve seen. After [Evan] found a cooking book that went into the physics and chemistry of making a meal, he wanted to make some really good meals. Sous [...]
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14:57
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Hack a Day
[Bertho] really enjoyed pawing through the pile of projects submitted to the 7400 logic contest. But one thing kept hitting him with the vast majority of the entries: decoupling capacitors were missing from the circuits. If you’ve worked with microcontrollers or digital logic chips you probably know that you’re supposed to add a small capacitor [...]
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10:01
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Hack a Day
[74hc595] just finished his entry in the 7400 logic contest. It’s a drum machine built entirely from 7400-series logic chips. He hasn’t quite reached full completion of the project yet. The hardware works just fine, and he’s built a foam core face plate with many more controls than you see here but much of the [...]
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10:01
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Hack a Day
[Jonathan Thomson] just finished writing up his entry for the 7400 logic contest. It’s a voltage doubler that uses a 74HC14 logic chip. Because this is not at all what the chip was meant for–and he’s a sucker for puns–he’s calling it the Illogical Dickson Doubler. What he’s got here is basically a charge pump [...]
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9:01
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Hack a Day
[Bertho]‘s submission for the 74xx logic contest is really impressive. He designed a capacitive sensing touchpad using only 74xx and 40xx logic chips. We’re impressed with the build and his writeup is one of the best resources we’ve ever seen for capacitive sensing. There are two ways to go about designing a capacitive touchpad. The [...]
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8:01
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Hack a Day
[Caleb] is hard at work on a driving game based on 7400 series logic chips. This will be his entry in the Open 7400 Logic Competition, and it really outlines why this contest is especially tricky. The concept behind the game is quite simple. You’re the driver of a car (the red dot at the [...]
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12:01
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Hack a Day
Here’s another chance to ply your hacking skills for cash and prizes. Dangerous Prototypes has just announced the Open 7400 Logic Competition. First prize is $100 and a bunch of hacking goodies. But even better is that since it was announced, more sponsors have stepped up to increase the kitty, and the number of entries [...]
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14:01
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Hack a Day
[Eric] needed a project for his digital logic design class, and decided on a lock that open in response to a specific pattern of knocks. This is a fairly common project that we’ve seen a few builds with ‘knock locks,’ but this one doesn’t use a microcontroller. Instead, it uses individual logic chips. The lock [...]
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4:06
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Hack a Day
Although [Jack] just graduated High School and doesn’t have much experience with electronics, that didn’t stop him from building the DUO Adept, a homebrew computer built entirely out of TTL logic chips. The DUO Adept has 64k of memory, 6K of which is dedicated to the video ram that outputs a 240×208 black and white [...]
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11:21
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Hack a Day
One thing we learned by watching [Alton Brown] on all of those Good Eats episodes is that a multitasker is way better than a unitasker. [Joost] is thinking along the same lines by taking a fantastic tool and adding a useful function to it. His software project turns a USB Saleae Logic Analyzer into a signal [...]
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12:01
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Hack a Day
[Q] is an Electrical Engineer who works in an industrial setting. He frequently uses Programmable Logic Controllers at work but had never built one himself. He decided to undertake the project at home and managed to build a PLC that outputs 120V AC or 12 V DC and has optoisolated inputs. On the circuit board [...]
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6:17
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Hack a Day
[Wulfden's] new gadget is a 28 channel 3.3 volt digital logic analyzer. Powered by a Parallax Propeller running at 100MHz (permitting a 10 nanosecond sampling rate), using all though hole parts, and open design so it is possible to whip up your own. Data is collected and sent to a host computer running Propalyzer which [...]
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4:22
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Packet Storm Security Exploits
This is a proof of concept to demonstrate a logic security flow in the way Drupal CAPTCHA is used to protect login forms from bruteforce. If the CAPTCHA challenge is solved, the next login attempts can be issued without solving any new CAPTCHA challenge.
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4:22
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Packet Storm Security Recent Files
This is a proof of concept to demonstrate a logic security flow in the way Drupal CAPTCHA is used to protect login forms from bruteforce. If the CAPTCHA challenge is solved, the next login attempts can be issued without solving any new CAPTCHA challenge.
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4:22
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Packet Storm Security Misc. Files
This is a proof of concept to demonstrate a logic security flow in the way Drupal CAPTCHA is used to protect login forms from bruteforce. If the CAPTCHA challenge is solved, the next login attempts can be issued without solving any new CAPTCHA challenge.
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8:04
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Hack a Day
[Spi Waterwing] wrote in to make sure that we were aware of Logisim, a Java-based open source digital logic simulator. We’ve used Atanua quite a bit in the past but hadn’t heard of this program. It seems to have a pretty big educational following and right off the bat it’s got a feature we’ve always [...]
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22:01
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Packet Storm Security Recent Files
Apache Shiro version 1.0.0-incubating suffers from an information disclosure vulnerability. Shiro's path-based filter chain mechanism did not normalize request paths before performing path-matching logic. The result is that Shiro filter chain matching logic was susceptible to potential path traversal attacks.
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22:00
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Packet Storm Security Exploits
Apache Shiro version 1.0.0-incubating suffers from an information disclosure vulnerability. Shiro's path-based filter chain mechanism did not normalize request paths before performing path-matching logic. The result is that Shiro filter chain matching logic was susceptible to potential path traversal attacks.
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11:10
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Hack a Day
[Christian Weichel] has been hard at work developing LogicAnalyzer, an open source tool that may interest you. It is designed with SUMP Logic Analyzers in mind but a main goal is expandability. What this means is that it plays nicely with things like the Open Workbench Logic Sniffer or you can do a bit of [...]
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9:30
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Hack a Day
The Superprobe is a logic analyzer, multimeter, and much more rolled into a fun to build project. [Ben Ryves] didn’t come up with the original idea, but he definitely took a good thing and made it better. You can use it to test logic, inject logic into a circuit, read capacitors and resistors, test frequency, [...]
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20:00
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Packet Storm Security Advisories
Secunia Research has discovered a vulnerability in imlib2, which can be exploited by malicious people to compromise an application using the library. The vulnerability is caused by a logic error within the IMAGE_DIMENSIONS_OK() macro in src/lib/image.h. This can be exploited to cause heap-based buffer overflows via e.g. specially crafted ARGB, XPM, and BMP image files.
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12:30
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Hack a Day
If you’ve got a graphic LCD lying around you can build this four-channel logic analyzer with a couple handfuls of cheap components. [Ronald de Bruijn's] design uses a PIC18F4580 to sample up to four logic inputs at a maximum resolution of 2 MHz. He’s included the PCB artwork so that you can etch your own [...]
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7:18
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Hack a Day
[Lucassiglo21] developed this logic clock without using a crystal oscillator or a resonator. Instead, he’s letting the incoming electricity keep the time for him. The supply is AC at 50 Hz so he’s using some 4017 decade dividers to reduce that down to a 1 Hz signal. From there it keeps track of the ticks [...]
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12:51
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Hack a Day
the folks over at OpenSchemes are at it again. This time they’ve cracked open a low end ZerPlus logic analyzer and modified it to function the same as the higher end model. The 16 channel version they purchased appeared to be fully capable of handling the 32 channels of the more expensive model. The installation [...]
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15:28
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Hack a Day
Hackaday alum [Ian Lesnet] has been working in cahoots with a dedicated team of developers to produce the OpenBench Logic Sniffer. This caseless logic analyzer can operate at 100MHz and sample 32 channels at once. Better yet, a digital oscilloscope add-on is in the works. The pre-order comes in at $45, that’s a lot of [...]
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8:30
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Hack a Day
[Mike Bradley] wanted to use his oscilloscope to display 8 channels of digital signals. Alas, the analog unit didn’t have this capability. Not to worry, he threw together an adapter module that does the trick. Using a PIC 18F26K20 microcontroller he inputs four or eight channel digital logic (at 5V) and filters the output to [...]
1337day (was: Inj3ct0r, 1337db)
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