Jun 25
An RFID system consists basically of two compo-
nents:
Transponder
(fixed on an object that shall be identified)
Reader
(or interrogator base station)
A transponder includes the IC, and in LF systems
optionally a capacitor and a coil. HF systems only
need a coil, UHF systems an antenna. The reader
generates an RF field which is used to transmit
power and to per form bi-directional, contactless
data transmission (no connection or line-of-sight
necessary). As soon as a transponder or smart
label gets into the field generated by the reader, the
tag transmits information either immediately or on
request only. The reader decodes this information,
sends it to a host, or displays it.
RFID Applications
Versatile and flexible products form an Atmel prod-
uct scope that offers solutions for almost all appli-
cations in the main RFID market segments. Atmel’s
products fulfill the market requirements that call for
fast, secure and reliable identification systems.
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Jun 25
ASTM Format
Analyzers format responds to the ASTM specifications E-1381 & E-1394:
• E-1381: Standard specification for Low Level protocol to transfer messages between
clinical or laboratory instruments and computer systems.
• E-1394: Standard specification for transferring Information between clinical or
laboratory instruments and computer systems.
1. Connection specifications (ASTM E-1381)
1.1. Hardware and software characteristics
You can setup Baud rate, Parity, Stop bit,…
Hardware setting of the interface: Connect the Host and the instrument by the DB9 serial
port.
1.2. Output data characteristics
Characters: ASCII
Maximum message length: 247 characters.
Analyzer manages Xon/Xoff protocol.
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Oct 13
Sylvain submitted his latest project: a geiger counter with a USB interface. Thanks for sharing your nice project!
source : http://electronicfr.com/index.php/Microcontrollers-programming/How-monitor-radioactivity-with-a-PC.html
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Oct 13
Audium Semiconductor has launched an audio power amplifier IC which, at normal listening levels, is 20 times more efficient than competing devices, such as Class D amplifiers, without compromising audio quality. The AS1001 operates from a nominal 1.5 V power supply and delivers 100 W peak power output. The amplifier is so efficient that battery-powered amplified loudspeakers can run for up to 10 months on a set of four ‘C’ batteries, playing for three hours per day.
The amplifier also enables the development of smaller, cooler, mains-powered audio equipment, with fewer heat sinks. Applications include totally wireless speakers, home theatre surround sound speakers and battery-powered travel speakers. Future Audium ICs will support MP3 docking stations and USB powered speakers.
The AS1001 architecture uses patented techniques to minimise both fixed power losses and output-dependant variable power losses. The modulation scheme uses low switching rates to minimise switching losses. Power rail switching means that the amplifier operates efficiently from a low voltage rail most of the time, with a DC-DC boost converter driving higher voltage transistors on extreme audio peaks.
source : http://www.elektor.com
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