Project Solutions

Trends in Microcontroller （1）

Published:2011/7/31 20:56:00 Author:Phyllis

By Christian Tavernier AN ABUNDANCE OF CHOICE The number of different microcontrollers on offer just keeps on growing. Nearly every single week a new product appears on the market. Choosing the right microcontroller for a particular design is becoming increasingly more difficult. Reason enough to appraise the latest developments. 16-bit devices appear to be old ha...   (View)

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Wireless USB （2）

Published:2011/7/31 20:42:00 Author:Phyllis

By Thomas Biel The Cypress wireless USB family is already in production (since 2003). It uses the 2.4-GHz band, which is available for use without licensing in most countries, while the frequency range preferred by Intel and the MBOA (3.1-10.6 GHz) can be expected to encounter problems with licensing, as it is often used for military purposes in Europe. Cypress offers a variety o...   (View)

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Wireless USB （1）

Published:2011/7/31 20:33:00 Author:Phyllis

By Thomas Biel Conventional USB has certainly become an indispensable feature of everybody’s desk. It is used to connect scanners, cameras, hard disks, sound systems and webcams after the initial installation, and the PC or laptop can remain switched on while the cables are connected or disconnected. This is naturally all very convenient, but the drawback is the large number of cables attac...   (View)

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Wireless Tyre Pressure Monitoring （1）

Published:2011/7/29 1:43:00 Author:Amy

By Helmuth Lemme Sudden tyre failure is not only annoying but also downright dangerous. In the future, new technology will help to reduce the number of accidents caused by tyre problems, with recently developed sensor systems constantly guarding tyre pressure and issuing a warning signal well before disaster strikes. In 85% of all cases, tyre rup­ture or explosion is caus...   (View)

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Resounding Truth an Acoustic Lie Detector （2）

Published:2011/7/29 1:16:00 Author:Amy

Bukhard Kainka Construction For this project too, we have designed a printed circuit board. However, this time not quite as you have come to expect from us. Figure 2 shows a PCB layout for our Universal Prototyping Board size-1 (UPBS-1) which can be purchased ready-made through the Elektor Electronics Readers Services. A normal piece of prototyping board, stripboar...   (View)

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Resounding Truth an Acoustic Lie Detector （1）

Published:2011/7/28 22:49:00 Author:Amy

By Bukhard Kainka There are those cool-headed types, who can lie through their teeth with a straight face. But in the end it is just a matter of asking the right questions. Sooner or later everyone will get sweaty palms. Lie detectors are always a great deal of fun at parties. Who is prepared to face up to the challenge from technol­ogy? And also: who is able to defeat the machi...   (View)

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Electronic Valentine Heart: LEDs are red my dear （1）

Published:2011/7/28 22:25:00 Author:Li xiao na

Design by F. Wolling Although this month’s Mini Project is not exactly stunning from a technical point of view, there are a number of unusual sides to it, mainly regarding why and how it came to be published in this issue. Read on... Unusual aspect no. 1: This is the first Valentine circuit ever to be published in Elektor, and no, the highstreet flower shops are not to bla...   (View)

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CoolRunner-ll: Xilinx CPLD Development Kit （3）

Published:2011/7/28 22:10:00 Author:Li xiao na

By Paul Goossens Software The software that comes with the kit is extremely extensive and distributed across two CD-ROMs. The design software and a number of examples may be found on tire CD-ROM labelled iSE’. The other CD-ROM contains a multimedia presentation about the development board, together with some additional technical information. In our case the ISE software suit...   (View)

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Sensors for Humans: Sensor Technology at MIT （3）

Published:2011/7/28 22:08:00 Author:Amy

By Delano L. Klipstein MEMS for biosensors Joel Voldman, Assistant Professor of Electrical Engineering at MIT, reported on BioMEMS. Cells contain a large quantity of useful pieces of information which are not only of interest to doctors. Modern criminology is also dependent on cell research. Today’s typical experiments use cell cultures con­sisting of more than ...   (View)

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Alternatives for battery-backed RAM

Published:2011/7/28 21:54:00 Author:Phyllis

Many microprocessor boards include a static RAM that stores a variety of system settings. It is often desirable to keep these settings when the power supply is turned off or interrupted. For this reason a backup battery is mounted on these boards, which provides standby power to the SRAM. At first sight, this seems a simple solution, but it is far from ideal. Batteries take up a fair amount of space on the ...   (View)

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CoolRunner-ll: Xilinx CPLD Development Kit（2）

Published:2011/7/28 21:53:00 Author:Li xiao na

By Paul Goossens The hardware The printed circuit board comes with a CPLD type XC2C256TQ144-7 fitted ex-factory. If desired, a second CPLD may be fitted on the board — this may be an XC2C64 or an XC2C32. An oscillator running at 1.8432 MHz supplies the clock signal required by the CPLDs. The oscillator module is fitted in an IC socket allowing it to be easily exchanged if a differ...   (View)

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Sensors for Humans: Sensor Technology at MIT （2）

Published:2011/7/28 21:43:00 Author:Amy

By Delano L. Klipstein Wireless physiological data measurements Phil Shaltis, research assistant in the Department of Mechani­cal Engineering, agrees. He reported a sensor in the form of a finger ring which can measure blood pressure and oxygen sat­uration levels and transmit them wirelessly to a monitoring station. The challenge in this case is not ...   (View)

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CoolRunner-ll: Xilinx CPLD Development Kit （1）

Published:2011/7/28 21:43:00 Author:Li xiao na

By Paul Goossens Here’s a brief article about an attractive development kit from our friends at Xilinx, which is not only rich in contents but also affordable for the hobbyist! The board is supplied ready-built and comes with two CD-ROMs crammed with software. PALs and GALs never really made it into the world of hobby electronics, despite the fact that these components are instrumen...   (View)

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The Commercially available WiNeS UMTS Optimization Solution

Published:2011/7/28 21:39:00 Author:Phyllis

Radioplan, the leading supplier of 3G radio network planning, optimization, and measurement analysis solutions, announced its commercially available WiNeS UMTS optimization solution that cut the cycle time for tuning the radio access network of a large city by over 80% in 2004. WiNeS was a sophisticated and fully-featured 3G optimization toolset that had been developed to its current level of advanced funct...   (View)

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Sensors for Humans: Sensor Technology at MIT （1）

Published:2011/7/28 21:21:00 Author:Amy

By Delano L. Klipstein Polymer Electronics for Chemical Sensors’ was the topic for the tenth research and development conference at the Massa­chusetts Institute of Technology (MIT), which gave an Overview of current developments in the field of plastic elec­tronics. The name of one speaker made us prick up our ears: Professor Timothy M. Swageris associate director of the ’Institute...   (View)

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iAccess--an intelligent access control system （6）

Published:2011/7/28 21:21:00 Author:Li xiao na

Design by I. Joostens Overview of the menu structure The menu structure is quite simple and intuitive. If you use Table 1 as a reference, you should not have any significant problems. Nevertheless, a few remarks are in order with regard to keys and access privileges (which are called ’access rights’ in the menus). A particular iButton can only be stored once in t...   (View)

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No escape from the labyrinth

Published:2011/7/28 21:13:00 Author:Phyllis

Most lasers used in the manufacture or marking of boards generate hazardous dust and fume that should be controlled by an extraction and filtration system. This is also true in hand or machine soldering application producing solder fume. The cost of ownership of these filtration systems in terms of replacement filters can be a concern for the end user but the new patented Labyrinth filler from Purex may ju...   (View)

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iAccess--an intelligent access control system （5）

Published:2011/7/28 21:01:00 Author:Li xiao na

Design by I. Joostens Basic settings Provisionally connect four pushbutton switches to the S1-S4 positions on the circuit board. These buttons have the following functions: SI = Reset, S2 = Enter, S3 = Down, S4 = Up. Also provisionally connect an iButton probe to pins 1 and 3 of K2, with the centre contact of the probe attached to pin 1 and the outer contact connected to pin...   (View)

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VHF-Low Explorer （3）

Published:2011/7/28 21:01:00 Author:Phyllis

By Gert Barrs Inside the receiver Figure 3 pictures the circuit diagram of our little receiver. MOSFET Tl at the antenna input provides a gain of about 18 dB across the band, driving the TDA7000 RF input via coupling capacitor C5. The receiver’s input impedance is 50 D to match most types of coax cable available these days. A number of capacitors strewn around the...   (View)

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VHF-Low Explorer （2）

Published:2011/7/28 20:47:00 Author:Phyllis

By Gert Barrs What’s in it for me While the radio amateur fraternity is poised to grab their share of the spectrum around 70 MHz, it should be noted that the 68-88 MHz band has other, equally interesting users and applications including Government, MoD and PMR {private mobile radio) communications (not encrypted in many cases), security services, telemetry and the odd TV station. Un...   (View)

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