by Stephen Evanczuk @ digikey.com:
Pulse-energy-harvesting applications convert bursts of energy to sufficient power for operating simple circuits such as wireless switches, wireless data loggers, remote controls, and the like. To build these designs, engineers can draw on a wide variety of available ultra-low-power ICs and energy transducers from manufacturers including EnOcean, Linear Technology, Linx Technologies, Maxim Integrated, Measurement Specialties, Microchip Technology, Mide Technology, ROHM Semiconductor, Schurter, Silicon Labs, and Texas Instruments, among others.
Powering Circuits through Pulse-Energy Harvesting - [Link]
by praveen @ circuitstoday.com:
This article is about a simple auto ranging ohmmeter using arduino. The measured resistance is displayed using a 16×2 LCD display. The circuit is sufficiently accurate and uses minimum number of external components possible. Before going into the details of this project, lets have a look at the basic resistance measurement method.
OhmMeter using Arduino – with Auto Ranging Feature - [Link]
An app note (PDF!) from Renesas on how to minimize power consumption when sensing switch inputs
A switch input is one of the simplest interfaces to an MCU. However, when very low power designs are needed the pullup or pulldown resistor for the switch can draw a significant current. If the switch input is a momentary switch the current flow is very short so it is rarely significant. However, if the switch input is a door switch or level sensing switch
or any other switch which may remain in the active state for a relatively long time the energy used must be considered
Most of the discussion that follows gives examples for pull-up devices with the switches, the same principles apply for pull-down components. Also all the discussions assume that the EVdd = Vdd (all ports powered from the same supply voltage).
Minimizing power consumption when sensing switch inputs - [Link]
Webinar introduced UDOO as a powerful single board embedded SBC based on the powerful Freescale i.MX6 chip, which offers complete and powerful platform for your applications.
Looking for a powerful platfom for your Linux applications? - [Link]
The LTC®4121 is a 400mA constant-current/constantvoltage (CC/CV) synchronous step-down battery charger. In addition to CC/CV operation, the LTC4121 regulates its input voltage to a programmable percentage of the input open-circuit voltage. This technique enables maximum power operation with high impedance input sources such as solar panels.
An external resistor programs the charge current up to 400mA. The LTC4121-4.2 is suitable for charging Li-Ion/ Polymer batteries, while the programmable float voltage of the LTC4121 is suitable for several battery chemistries.
LTC4121/LTC4121- 4.2 – 40V 400mA Synchronous Step-Down Battery Charger - [Link]
by Matt Richardson @ makezine.com:
Spark has improved and expanded their product line with the Photon wi-fi development board and a pair of new wireless modules for custom circuit boards. The Photon improves on the popular Spark Core microcontroller by adding 802.11n wi-fi connectivity, SoftAP for provisioning, more memory, and a faster ARM Cortex M3 processor. Like the Core, it sits right into a standard breadboard for easy prototyping. And best of all, it can be had for $19.
Photon – A Wi-fi Microcontroller for $19 - [Link]
by Jeremy Cook @ makezine.com:
Most of us have probably seen clocks or numerical displays that flip sequential boards to display the next number in a sequence. If you wanted to take that a step further, you could make a replica of “Dottie,” which flips small dots as pixels. As the great video below says, it makes a “pleasant mechanical flipping sound all day.” It also tells the date, chimes every 15 minutes, and gives an animation show once an hour.
Dottie the Flip Dot Clock - [Link]
BITalino is designed for anyone interested in building self-tracking applications based on information from your body.
BITalino is a low-cost, purpose-built, all-in-one hardware and software toolkit designed for quick and easy creation of cool projects with body signals, development of quantified self wearable devices or apps, and/or learning how to build medical devices. Comparative professional-grade tools for this purpose can easily cost in excess of $10,000; our vision is to make them available for anyone, and harness the power and creative thinking of the open-source movement to boost innovation in biosignal-based applications in unprecedented ways.
BITalino (r)evolution - [Link]
by Suzanne Deffree @ edn.com:
Intel announced its 4004 processor and its chipset through an ad in Electronic News on November 15, 1971, making them the first complete CPU on one chip and the first commercially available microprocessor.
The building-block 4004 CPU held 2300 transistors. The microprocessor, the size of a little fingernail, delivered the same computing power as the first electronic computer built in 1946, which, in contrast, filled a room. Full technical details for the 4004 can be found in this January 1972 EDN story on the technology: One-Chip CPU available for low-cost dedicated computers.
Intel 4004 is announced, November 15, 1971 - [Link]
by EEVblog @ youtube.com
Dave investigates two very serious issues with jitter on the Rigol DS1000Z series oscilloscopes, including the DS1104Z and new DS1054Z
Some sort of modulated sampling/trigger jitter problem at 5 microsecond intervals (the “5us jitter problem”). And severe jitter with the AC coupled trigger mode, a problem which is also present on the DS2000 series scopes as well.
EEVblog #683 – Rigol DS1000Z & DS2000 Oscilloscope Jitter Problems - [Link]