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14 Jan 2011

Dave reviews the new design BK Precision 879B handheld LCR meter.

BK Precision 879B Handheld LCR Meter Review – [Link]

14 Jan 2011

Alan Yates wanted a solution to wireless power transfer to his rotating POV device so he has done some experiments that are well documented on the page below. Check details on the link. [via]

DIY Wireless Power Transfer – [Link]

14 Jan 2011

Freescale Semiconductor has announced a new magnetometer chip for mobile devices incorporating magnetic compass capability, which it claims is smaller and consumes less power than competing devices. The Xtrinsic MAG3110 three-axis sensor can be used to determine headings for navigation, dead-reckoning, and various location-based services (LBSs). The MAG3110 is a quarter of the size of the currently most commonly used magnetometer chip, and its current consumption is only 25 μA, also a quarter or less that that of competing devices. [via]

Freescale shrinks magnetic compass chip - [Link]

14 Jan 2011

Led by mechanical science and engineering professor Nicholas Fang, Illinois researchers have demonstrated an acoustic cloak, a technology that renders underwater objects invisible to sonar and other ultrasound waves. [via]

Metamaterial hides underwater objects from sonar – [Link]

13 Jan 2011

This project is an electronics components tester based on PIC24HJ128GP204. It took 7 month for the author to develop it. The device can measure and automatically detect the connected components and it is powered using a LiIon battery. The results are shown on 320×240 65K color LCD screen.

Electronic Components Tester - [Link]

13 Jan 2011

If you want your programs to run more faster or want to squeeze bigger programs to fit in to MCU here is a solution. [via]

Having been frustrated with many of the inefficiencies of the Arduino core libraries, we have built an alternate set with performance and size in mind. Alastair has given a talk at the Canberra Linux User Group about this library – the slides can be viewed on SlideShare.

Programming Arduino more efficiently – [Link]

13 Jan 2011

The Xprotolab is the first mixed signal oscilloscope with an arbitrary waveform generator in a DIP module. It measures only 1.6″ sq. inches, and can be mounted directly on a breadboard. The Xprotolab can also be used as a development board for the AVR XMEGA microcontroller. The Xprotolab uses an ATXMEGA32A4 microcontroller, it uses the internal ADC with up to 2MS/s and the internal DAC for the arbitrary waveform generator of 1MS/s.

Xprotolab: Small fully featured atxmega32 scope – [Link]

13 Jan 2011

Jer writes:

Recently, I tested the 0832 LED Matrix Board that I purchased from Sure Electronics. Since I have a simple AVR microcontroller breakout board and a PIR sensor that senses motion, I decided to make something fun using the 0832 LED Matrix Board.

Motion Activated Message Display – [Link]

13 Jan 2011

A pair of AD8307 RSSI (Received Signal Strength Indicator) chips are used to produce DC voltages that are proportional to the logarithm of the Forward and Reflected power levels. These DC voltages can then be subtracted in an Op Amp to produce a voltage proportional to SWR which is essentially independent of power level.

SWR Meter – [Link]

13 Jan 2011

This project is using the Adafruit protoshield to build a four-contestant gameshow system. RoysterBot writes:

If you have ever watched a TV quiz show you have probably seen contestants trying to press a button in order to win a chance to answer a question. The contestant’s quick reaction time results in some kind of light and/or sound indicating victory. This is a practical way to choose the next focus of the game’s activity and it adds a bit of excitement to the process. So when the holiday party planning committee decided to have a trivia contest I decided to build a quiz contestant lockout system to add an extra dimension of fun to the festivities. This would help the planning committee’s mission of creating some entertaining activities for the event.

The minimum requirements were to have a system with multiple buttons that contestants press for a chance to answer a question. The first one to press the button would lock out the other contestants. The system would need to have a simple way to quickly identify who pushed their button first. And finally the system would need to be reset for the next round.

Considering the venue of the holiday party (an upscale wine bar) I felt that the contestant buttons would be one of the most important features. They needed to be hefty and able to withstand abuse by hoards of “beverage enhanced” partygoers.

Quiz-O-Tron 3000: Arduino quiz contestant lockout system – [Link]





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