Graphic showing the GPIO pin breakout on the Raspberry Pi B+ board.
Raspberry Pi B+ GPIO 40 Pin Block Pinout – [Link]
Watch signals propagate through basic digital circuits. Emulate any two-input logic gate using just one rLogic board and one jumper. To order rLogic+, the breadboard compatible variant, simply order normal rLogic. When the survey is sent out you will indicate which you would like.
rLogic is a basic breakout board for the Fairchild Semiconductor TinyLogic® series of Configurable Logic Gates, with an LED for watching signals and cleverly arranged header pins for simple conversion from gate to gate. Different from programmable logic, configurable logic is manually changed through rewiring using a simple shunt (AKA, a jumper), allowing you to easily and quickly morph a single pinkie sized board into any basic logic function you might need. rLogic requires no prior knowledge, but if knowledgeable of basic digital circuitry then you may jump right in with creating. If not, then a few minutes with rLogic boards will begin to teach you the basics of digital electronics.
rLogic: Affordable, Tiny, Universal Logic – [Link]
RS Components just announced the availability of Raspberry Pi Model B +.
After the success with Model B, three million items sold, Raspberry Pi has been enhanced with several new features and functions included in the Model B + version. Apparently:
the energy consumption of the Pi Model B+ are significantly lower (between 20% and 30% less than the B)
I / O lines have been expanded replacing the GPIO socket with one for 40-pin connectors (pinout for the first 26 contacts remains identical to that of the original Model B)
The number of USB ports is doubled from two to four
The new Raspberry B+ is here for RasPi lovers – [Link]
What’s inside a 1991 vintage IBM PS/2 L40SX 80386SX laptop?
EEVblog #639 – IBM L40SX Retro Laptop Teardown – [Link]
Anandtech tears down the LG G Watch and Samsung Gear Live:
The G Watch turns out to be pretty easy to take apart. There are four Torx T5 screws on the back, removing them gives you access to its internals. The 400mAh battery is integrated into the back cover. ARM’s teardown confirms 3.8V chemistry, resulting in a 1.52Wh total capacity.
The logic board in the Gear Live is a bit more complex. There’s a second layer stacked on the main logic board that also acts as an RF can.
LG G Watch and Samsung Gear Live Teardowns – [Link]
By Sergey Feingold @ makezine.com:
For makers, engineers, and DIY enthusiasts, Shenzen, China is a bit of a dream world. Once you get past the shoddy internet and questionable origin of the components you buy in the markets, you realize just how quickly and easily you can get almost anything done. For about $100 you can get a couple dozen 4-layer PCBs and a stainless steel stencil. For another $50 you can get it in 2 days. That’s seriously cheap, and the game changes when you have such ready access to fast, cheap manufacturing. The electronics market puts Wal-Mart to shame, and you can’t walk 20 feet without bumping into someone carrying a reel of components or pushing a cart full of capacitors. I was there with Lavie Sak, my co-founder for Shot Stats, makers of Challenger, a tennis swing tracking device. We were excited and overwhelmed by this new place and it seemed like anything was possible.
Prototyping a Tennis-Tracking Device in Shenzen: A Lesson – [Link]
Nodcah made this Instructables detailing the build of his DIY fingerprint scanning garage door opener:
As a person without a car, I don’t need to carry keys around everywhere I go. Because of this, I’ve been locked out of my own house several times. It’s a pain to wait for someone with a key, so I thought I would do something about it.
This project is my way of solving this problem, while getting the chance to interface with an awesome fingerprint scanner (aka: FPS).
Also, this module isn’t restricted to just garage doors, for you can create different kinds of simple motorized locks to suit your needs.
DIY fingerprint scanning garage door opener – [Link]
An all-in-one breadboard with Oscilloscope, Spectral Display, Function Generator, and Power Supply.
We are excited to bring a low-cost audio range electronics development board to classrooms, labs, small businesses, and techno-geeks everywhere. This idea has been bouncing around in our family for many years and now the technology has caught up to make it a reality at a price that schools and individuals can afford. We have paired a traditional prototype board (or breadboard) with an electronics suite so that the experimenter does not have to purchase the expensive electronics test equipment needed during development. It is everything we wish we had when we were learning about circuits on a breadboard.
Bakerboard: The Educational Breadboard with More – [Link]
Have no fear… even if this project sounds complex, you’ll easily learn in this article many things about high speed electronics and PCBs. In fact, my goal here is to teach you some basics about all the new problems that arise when you’re dealing with GHz signals
Amplifying nanosecond pulses for quantum physics experiments – [Link]
This Photodiode based Alarm can be used to give a warning alarm when someone passes through a protected area. The circuit is kept standby through a laser beam or IR beam focused on to the Photodiode. When the beam path breaks, alarm will be triggered. The circuit uses a PN Photodiode in the reverse bias mode to detect light intensity. In the presence of Laser / IR rays, the Photodiode conducts and provides base bias to T1.
The NPN transistor T1 conducts and takes the reset pin 4 of IC1 to ground potential. IC1 is wired as an Astable oscillator using the components R3, VR1 and C3. The Astable operates only when its reset pin becomes high. When the Laser / IR beam breaks, current through the Photodiode ceases and T1 turns off. The collector voltage of T1 then goes high and enables IC1. The output pulses from IC1 drives the speaker and alarm tone will be generated.
A simple IR transmitter circuit is given which uses Continuous IR rays. The transmitter can emit IR rays up to 5 meters if the IR LEDs are enclosed in black tubes.
555 Photodiode alarm – [Link]