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6 May 2011

Powercast Corporation has unveiled its Lifetime Power Wireless Sensor System for wireless environmental monitoring in HVAC control and building automation systems, which uses RF energy broadcast by remote units to power wireless sensor nodes without batteries or wires.

The Powercast system consists of three parts: a family of batteryless sensor nodes with embedded Powerharvester receivers for wireless power, a WSG-101 building automation system (BAS) gateway, and a TX91501 Powercaster transmitter. The first member of the family of sensor devices is the WSN-1001 wireless temperature and humidity sensor. Additional sensors for measuring measure CO2, pressure, light level, motion and other conditions will follow shortly. [via]

Batteryless RF-powered wireless sensor system targets building automation – [Link]

5 May 2011

Getting started with microcontrollers and simple wireless data transfer: [via]

I thought you guys might like this article, it shows you how to get started using those $10 433 MHz RF tx/rx pairs. The article explains the theory, shows an example schematic for receiver/transmitter and has the project firmware for both available for download.

Microcontrollers and simple wireless data transfer - [Link]

16 Apr 2011

Va7sa designed this RF analyzer as his entry in the Renesas RX design contest. He writes: [via]

The NimbleSig III RF Analyzer is a compact, relatively inexpensive instrumentation cluster intended for analyzing the transmission characteristics of RF circuits designed to operate within the frequency range of 200 KHz to 200 MHz.

The analyzer is capable of generating a pair of frequency agile RF signals with digital accuracy. It has measurement capabilities for gain/loss, phase shift and low level RF power. A tracking generator sweep system mode provides a high dynamic range swept frequency display of circuit amplitude response characteristics. A spectrum display mode permits the viewing of signals in the frequency domain.

The RX62N RDK was a solid choice for the controller. It provides control logic and comms for the various RF modules and for the human-machine interface, 4.3″ touch screen SLCD display. The powerful RX62N RDK with its abundance of connectivity options and supporting peripheral devices provides a paved road for a number of planned enhancements for this instrument.

For an exhaustive description of this project, download this 58 page PDF.

NimbleSig III RF analyzer using Renesas RX62N – [Link]

12 Apr 2011

dangerousprototypes.com writes:

JeeLabs has a product known as the JeeNode v5, which is essentially a miniature Arduino (Atmega328p) board with an onboard RFM12B wireless module. Boards are available with the serial interface (shown above) as well as USB.

You can buy the kit directly from JeeLabs, or build your own using the schematic and documentation provided.

While it’s not an Xbee compatible RF unit, the RFM12B has its own RF12 library of functions which should help you accomplish many control and data transfer tasks.

JeeLabs JeeNode combines Arduino, RF – [Link]

12 Apr 2011

cliffyd writes:

I am going to show you a step-by-step process to building a spybug from common electrical componenets.

Long range spybug – [Link]

12 Apr 2011

neelandan writes:

Probe for measuring in the Radio Frequency range built inside an earphone jack, designed to have minimum capacitance and complete shielding.

RF probe – [Link]

24 Mar 2011

tehnikservice.net writes:

The following construction allows a simple cable tester to determine whether the cable network is present in high-frequency signal from the source. It is a contactless version of the tester to detect the presence of a signal at distances up to 2m. It can be used to control all types of signal cables, such as divorce Ethernet,modem connections, digital TV, etc. The circuit lights an LED at the moment it accepts RF energy around the cable.

Network Cable Tester – [Link]

11 Mar 2011

Direct conversion RF receivers are different from the standard superheterodyne one as they don’t have IF stage, and so the radio signals are directly converted into audio signals. This project uses 3 555 timer ICs as the only active devices to construct a direct-conversion radio receiver for the 80 meter amateur radio band. [via]

555 Contest Entry: Direct conversion RF receiver for 80 meter amateur band - [Link]

18 Feb 2011

Semtech has released a line of “power and go” inexpensive data transmitter chips. The new SX1240 and SX1242 ISM-band RF transmitters enable true data-in/RF-out capability, with only an external crystal and antenna impedance matching network needed. [via]

Semtech RF data transmitter chips – [Link]

5 Feb 2011

If you are looking a wireless communication between two Arduino modules, this project might be helpful. It uses low costs RF transmitter and receiver from Sparkfun to establish a radio link between the Arduino boards up to 500 ft. Data can be transferred serially at the maximum rate of 2400 bps. [via]

Radio link between two Arduino boards – [Link]





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