Tag Archives: mobile applications

The Computer Without A CPU


[Jeff Laughton] was contacted by a customer that was interested in adding some automated functions to a printing press. Before eventually settling on a microcontroller for the job, [Jeff] went old school and started looking at logic gates, counters, and flip-flops. This lead him to the Motorola 14500 industrial control unit, a minimal processor with only 16 instructions. After a few ‘back of the napkin’ sketches, he came up with an extremely minimal computer that doesn’t use a microprocessor. It’s an interesting design notable not only for its electronic brevity, but also because it only uses one instruction.

The only instruction this computer will ever execute is an input test, the result of which controls a two-way branch. Instructions consist of an input address, output address, and a single bit of data. If the data bit is true, the computer jumps to one location in ROM, and if the data bit is false, a jump to another location is executed.

A computer really isn’t a computer without some form of memory, and this design is no exception. [Jeff] managed to add two bits of data between the 8-bit latch and 8-bit multiplexer in the design. This is enough to call a few subroutines which test the I/O-mapped memory to decide what the next instruction should be.

It’s a truly bizarre design, but actually much closer to a true Turing machine than the computers in your pocket, on your wrist, on your desk, and in your car.

Thanks [James] for the tip!


Filed under: misc hacks

Resolving OpenSSL Heartbleed for VMware vCenter Server 5.5 (2076692)

This article provides the resolution procedure for vCenter Server 5.5 in response to the OpenSSL Heartbleed vulnerability. *Note*: The Heartbleed issue affects the Windows version... Published: 4/20/14

Frequent NFS APDs after upgrading ESXi to 5.5 U1 (2076392)

When running ESXi 5.5 Update 1, the ESXi host frequently loses connectivity to NFS storage and APDs to NFS volumes are observed. You experience these symptoms: · Intermittent APDs for NFS... Published: 4/18/14

A virtual machine or host in VMware vCenter Server has alert icons but no corresponding alarm (2070859)

· The host or a virtual machine in vCenter Server inventory shows a red alert symbol. · There are no alarms listed in the Alarms tab. · The alert... Published: 4/18/14

Make a 3D Scanner for 60€ Using Old Hardware

3d laser scanner

[Till Handel] just put the finishing touches on a paper he wrote about how to build a cheap 3D scanner — mostly out of spare parts.

Using parts from old printers and notebooks, he’s cobbled together this rather rough-looking laser scanner. But don’t be fooled by its looks! It’s capable of scanning 360° around itself at distances from 0.3 – 5m, making it an excellent candidate for scanning rooms.

It uses a line laser and a webcam mounted on an arm driven by a stepper motor, which looks like it’s out of an old optical drive. An Arduino Uno and an A4988POW stepper driver control the system. The paper (Caution: PDF) is very detailed and published under GPLv3 (a general public license).

It works the same as many 3D scanners — a line laser provides a 2D profile/outline of the object being scanned that the camera picks up. As the system (or object) rotates, new profiles are recorded and sewn together to form a complete 3D image.

3d laser scanner diagram

To increase the resolution and accuracy of the scanner, you can always put a better camera on the end!

Filed under: laser hacks

Error occurs after upgrading from 5.0 U1 to 5.1 U1 using vSphere Update Manager (2076206)

After upgrading an embedded ESXi 4.1 host to 5.0 and subsequently upgrading the host to 5.1 using vSphere Update Manager, an error might occur during the boot... Published: 4/18/14

Samsung data center fire causes outage, errors on smart TVs and phones (update: fixed)

Seeing an error message on your Samsung phone, tablet or Smart TV today? You're not alone, as the Samsung.com website appears to be down and owners worldwide have reported anything from error messages to being unable to access apps on their smart...

Testing in PRD2 on 27/1/14 (2070675)

Testing in PRD2 on 27/1/14 Testing in PRD2 on 27/1/14 Embed link: How to install ESXi v4.0 U1 in scripted mode with a PXE-booted ESXi v 4.1 installer (1023973) Refer-to link: ESX host getting I/O errors with... Published: 4/18/14

Filament Extruder Pumps Out 1kg/hour!

3d printer filament factory

3D printers are awesome, and while the plastic filament may not be as much as a rip off as printer ink (yet), it’s still marked up at least 500%! If you really want to break free, you’re going to need your own filament extruder.

ABS, a typical printing material, will run you about $30 USD per kilogram. Don’t get us wrong, that will go a long way — but did you know ABS pellets (technically processed MORE than filament) can be as cheap as $3-4/kg?

What if you could buy the pellets, and make your own filament with them? If you do a lot of printing, this could save you a lot of money. We’ve seen lots of different filament extruders here on Hackaday, and here’s yet another iteration — capable of extruding at an extremely fast rate of 1kg per hour! [Ian McMill] was inspired by [Xabbax's] Low Cost Filament Extruder, and has put together an excellent Instructable guide on how to make your own — with his own flair of course.

Take a look!

Filed under: 3d Printer hacks

Remediation steps for critical updates to vCloud Automation Center 6.0.1 regarding CVE-2014-0160 Heartbleed vulnerabilit…

vCloud Automation Center 6.0.1 requires an update to resolve a security issue found in older versions of the OpenSSL... Published: 4/18/14

Flexible Arduino Sure to Be A Hit


Scrolling LED on soda can

Wearable, lightweight hacks have long been dominated by the Lilypad. This will probably change with the introduction of the Printoo. Using printable circuit technology, the Printoo takes a modular approach to enable hackers, makers, and engineers alike to construct flexible circuits that can be put on almost anything, including paper!

Powered by the all too familiar ATmega328, the Printoo core module is fully compatible with the Ardunio IDE. The modular design enables functionality with several other printed devices including displays, batteries, sensors and even LED strips to make many different projects possible. One of the most interesting modules is the 1.5 volt, 500 micron thick electrochromic display.

Be sure to check out their Kickstarter, which has a nice video that demonstrates the project. If funded, they will be available in October in case you want to get your hands on one. Or feel free to make your own. Just be sure to let us know if you do!

Filed under: Arduino Hacks, wearable hacks