The people behind lowpowerlab has come up with a nice solution to switching your Raspeberry Pi on and off. Using a microcontroller and letting it communicate with the Pi over GPIO, the power supply is kept in sync with the Pi. All is explained in the video below.
The great Introduction to Machine Code for Beginners by Lisa Watts and Mike Wharton from 1983 is available online.
This book is a simple, step-by-step guide to learning to program in machine code. Machine code is the code in which the computer does all its work and programs written in machine code runs much faster and take up less memory space than programs in BASIC. A machine code program, though, is much more difficult to write and less easy to understand than a program in BASIC.
I remember reading this as a kid, so I presume that it was translated into Swedish. Still, a colourful introduction to how the machine thinks. I’ll show it to my daughter this weekend.
The Raspberry Pi Foundation just announced the availability of the long awaited camera board.
The camera boards are now available for order! You can buy one fromRS Components or from Premier Farnell/Element14. We’ve been very grateful for your patience as we’ve tweaked and refined things; it’d have been good to get the camera board out to you last month, but we wanted your experience to be as good as possible, and we’ve been working on the software right up until last night.
For such a small device, this has been an enormous project, and a year-long effort for everybody involved. We’re pretty proud of it: we hope you like it!
For the curious minded, there is a small video demonstrating how to get it started.
Adafruit is a great resource for may electronic projects. One of my favorite parts is their focus on wearable electronics. Gizmos with LEDs and speakers have been around for a while. You can even get them from Thinkgeek. However, capacitive touch with conductive fabric opens possibilities.
I’m not sure if this ever will become mainstream. But imagine having sensors for vitals integrated in your t-shirt. Monitoring pulse, breathing, etc without any clumsy sensors. This, coupled with movement-based power generation, I’m sure we will see more and more in the future.
FPGAs are a fascinating piece of technology. Gaming can also fascinate. Merging the two in a retro recreation of a the classical NES means that I have to write about it.
Ludde (from Gothenburg, just as myself) built a NES inside a Xilinx Spartan-6 FPGA as a project over Christmas. The system drives a VGA output and emulates the CPU, PPU and APU, i.e. processing, graphics and audio units. Conveniently enough, the controllers are hooked up via USB, so you do not have to dig out the originals.
Over the last year, or there about, we’ve had Flattr links at the bottom of all posts on Digital Fanatics. The total yield of these is EUR0.52, or which one payment came from Thingiverse and the other from my account on Flattr.
The conclusion of this is that this site either targets the wrong audience, or that Flattr does not work. I kind of liked their idea, but for now, the link goes away.
Jörg Wolfram has re-created the ZX81 system using an ATMega AVR MCU. The system uses a PS2 keyboard, NTCS (or VGA/LCD) for graphics and an SD-card instead of a tape. Looks like a great recreation of the past. The curious can read more about it here (Google translated, original German here)