by talk2bruce @ instructables.com:
Using a Raspberry Pi, a Raspberry Pi camera module, a PIR motion sensor, a USB WiFi adapter, a handful of parts, and a couple of Python programs, you can construct a camera that will automatically snap photos or record short videos when something moves in front of the camera and will automatically upload the photos/videos to Dropbox. This instructable shows how to build a Raspberry Pi Motion Sensitive Camera.
Raspberry Pi Motion Sensitive Camera - [Link]
by Colin Jeffrey @ gizmag.com:
Liquid Crystal Displays (LCDs) are a common and increasingly pervasive method of displaying information for everything from watches to giant TV screens. Though, like most other displays, LCDs require electrical energy to constantly display an image. Researchers from the Hong Kong University of Science and Technology, however, have produced an ultra-thin LCD screen prototype that is not only capable of displaying images without continuous power, but in 3D as well.
Energy-efficient 3D display maintains images without power - [Link]
The LTC2645 is a family of quad 12-, 10-, and 8-bit PWM-to-voltage output DACs with an integrated high accuracy, low drift, 10ppm/°C reference in a 16-lead MSOP package. It has rail-to-rail output buffers and is guaranteed monotonic. The LTC2645 measures the period and pulse width of the PWM input signals and updates the voltage output DACs after each corresponding PWM input rising edge. The DAC outputs update and settle to 12-bit accuracy within 8μs typically and are capable of sourcing and sinking up to 5mA (3V) or 10mA (5V), eliminating voltage ripple and replacing slow analog filters and buffer amplifiers.
LTC2645 – Quad 12-/10-/8-Bit PWM to VOUT DACs - [Link]
by Martin Rowe @ edn.com:
Teledyne LeCroy has announced the LabMaster 10-100Zi, the world’s first 100-GHz real-time oscilloscope. First demonstrated in 2013, the LabMaster 10-100Zi acquisition module for the LabMaster 10 Zi oscilloscope makes a significant jump in bandwidth over the previous record of 65 GHz, also held by Teledyne LeCroy.
100 GHz real-time oscilloscope arrives - [Link]
by Bill Schweber @ digikey.com:
With very few exceptions, every electronic circuit needs an oscillator, also referred to as a clock, clock generator, or timing circuit. Its role is to provide the “heartbeat” for the processor, memory functions, communications ports, A/D and D/A converters (if any) and many other functions. In non-critical, low-budget situations such as $10 mass-market electronic thermometers, this clock may be made from a simple resistor/capacitor (RC) oscillator. However, for the vast majority of situations which are more critical, the oscillator is based on a quartz crystal (Figure 1). This is a mature (80+ years) and highly effective technology which can support of wide range of frequencies from kHz to hundreds of MHz, with performance spanning fairly good to excellent, depending on the crystal cut, fabrication, packaging, and other considerations.
MEMS Oscillators Challenge Quartz Crystals in RF Applications - [Link]
Paranoia abounds! well maybe a bit – we are in a situation where we don’t trust our tools – especially our crypto tools – this project is an attempt to create a cheap open source entropy generator that’s open enough that one can verify and trust it.
We’ve based our design on an existing platform – our Cheap RF system – mostly because it’s cheap to build, we had existing hardware, and had just finished bringing up a USB stack for it
Our simple device is a USB stick, it is open source hardware, you can build your own, runs open source firmware – and you can physically open it to make sure that what’s inside is what you expect. With an external programmer you can also program it with your own firmware.
We generate ~350kbits per second of entropy packaged at ~7.8 bits/byte – if you use the entropy data at a lower it accumulates and we quickly approach 8 bits/byte.
OneRNG – Open Random number generation project - [Link]
This device was built at Recursive Software Development Labs in order to be mounted on a rally car competing in the Estonian National Rally championship.
The racing team needed help realizing a reliable measurement device which would output the currently inserted gear on a large, bright led display.
The biggest challenge to overcome was that the existing mechanical sequential gearshift would only allow enough room for a small potentiometer to be attached to its main axis, but the mounting mechanism is highly subject to vibrations, therefore after some time the readings would become unreliable or jittery.
Rally Gearshift Display - [Link]
CPU Atmel AT91SAM9G25 SoC (ARM9 @ 400Mhz)
DDR2 Ram 128 or 256 MByte
Power supply: 5VDC via microUSB or 3.3VDC using the PCB pads
Line levels: TTL 3.3V (NOT 5V tolerant)
Operative temperature range:
ARIETTA-G25 (128MByte RAM): -20 +70 °C
ARIETTA-G25-256 (256MByte RAM): -0 +70 °C
PCB layers: 8
RoHS and REACH compliant. Low EMI
Availability: > 5 years
Designed and Made in Italy
Arietta G25 – Tiny, cheap and easy ARM9@400Mhz Linux Embedded module - [Link]
Hey all, this is my first post on this blog, so I’d like to say hello! I’m Ian M, a high school student who likes breaking(/fixing(/breaking again)) electronic stuff. I was just sitting around, and I wanted to see how cheap I could make a usb avr isp programmer. I based the design off of http://www.simpleavr.com/avr/vusbtiny, which is based off of the original UsbTinyIsp. For the firmware, I just took their firmware and re-compiled it. The source is available at http://www.simpleavr.com/avr/vusbtiny/vusbtiny.tgz?attredirects=0. Their post uses 3 resistors, 2 diodes, 1 capacitor, and an MCU. I thought I could do better. Turns out you don’t need two of the resistors, or the diode. My schematics are released into the public domain, and the original code stays under its original licence (which I don’t exactly know what it is, but I bet it’s in the readme).
Tiny, Tiny, AVR Programmer - [Link]
Raj writes with this technique for installing open source drivers on Windows.
I came across a surprisingly simple approach to installing USBasp and USBtiny drivers for all versions of Windows — XP, 7, 8, 8.1, whether 32-bit or 64-bit, all inclusive! As you may know, installing open-source drivers such as USBasp and USBtiny have been a great pain on some of the recent Windows OS, due to the enforcement of signed drivers. The typical solution involves rebooting Windows into a mode that disables driver signature enforcement. This can be a huge source of frustration.
While searching for ‘fully signed USBasp driver’, I came across this tool called Zadig, which can be used to install libusb drivers on all versions of Windows, and it’s digitally signed. Since USBasp and USBtiny are both based on libusb, it worked really well — I was able to install both drivers on Windows XP, 7 (32-bit and 64-bit), 8, and 8.1 instantly, without messing with driver signature enforcement at all. I was mostly surprised such a great solution wasn’t documented more widely online.
How-to install open source USBasp and USBtiny drivers on Windows - [Link]