|Wireless remote data
Technologies and sample systems that gather sensor data across distances, usually via radio links. This includes general telemetry and SCADA (supervisory control and data acquisition), especially for gathering data about wildlife, natural resources, and distributed energy systems.
Ken Novak's Weblog
Monday, March 15, 2004
WI-FI wireless revolution in South-Africa
: A discussion on community wifi networking in South Africa, including tips on defying the regulators, on using wifi for 50km links, and on setting up neighborhood perimeter security systems with webcams and infra red motion detectors. 8:14:09 AM
Saturday, March 13, 2004
RFID and sensor tags for sale: "The RFID division of Mannings, a company located in Southport, Merseyside, England, has launched a new system of RFID tags and readers that can monitor machines used in industrial and manufacturing plants. The system features RFID two tag models—dubbed aTAG 1 and aTAG 2—with chips that can be configured to operate in any frequency ranging from 860 MHz to 920 MHz. The reader, which can accept signals from aTAG tags regardless of the chosen frequency, has a read range of up to 100 meters. Measuring 70mm by 64mm by 23mm in size, aTAG 1 has a total of 18 inputs (six analog and 12 digital) that can accept data from a variety of sensors; the smaller aTAG 2 has six (two analog and four digital). 12:00:09 AM
Both tag models come with a temperature sensor, a battery, a battery-level sensor and a flash memory card that enables the configuration of the tag’s frequency and data transmission rate. The memory card also records the tag’s alarms settings for sending out alerts whenever a particular event happens. Battery life can last up to 10 years, depending on the signal and input frequency. The tags can also be wired to power source.
Each aTAG tag is identified by a unique algorithm that lets an aTAG reader pinpoint the tag’s location and, if the tag is moving, its direction of movement. The tag can by connected to temperature transducers, flow meters, pressure monitors, gas analyzers or other instruments that use 4 to 20 milliamp analog or digital I/O outputs. Once the reader receives the data transmitted by the tag, the data can be relayed to a PC or plant monitoring system using a standard RS232 cable.
Mannings and its partner, Handels Ock Konsulthuset Plefo AB, a company in Sweden, say the aTAG system can be integrated into existing building management systems, supervisory control and data acquisition (SCADA) software systems, or other monitoring software and is also compatible with wireless technology from Bluetooth. .. The aTAG readers and tags cost £40 to £180 (US$72 to US$324) each." The Mannings site has examples of readers for applications like livestock tracking.
Thursday, March 11, 2004
Radio E-mail in West Africa: IRC uses a Codan-based HF radio email network, using Qmail and other open-source packages on salvaged computers. "The International Rescue Committee (IRC) has one of their largest operations in Guinea, providing services and support to a population of up to 200,000 refugees quartered in many camps established throughout the country. I became involved with IRC when my wife accepted the position of Country Director for the program in the summer of 2001. ..
The current result of our own Radio E-mail project is that we are now serving mail to over 50 desktops and 150 staff in four offices throughout Guinea. The entire wide area network is serviced behind a single public IP address, at a total ISP cost of $150(USD) per month. Based mostly on existing hardware, the Radio E-mail project has leaped boundaries and opened dialogs for its users that were previously not possible. Best of all, the system has deployed standard network and internet technologies throughout the organization and throughout Guinea utilizing the freely available, best of breed, borderless open-source technologies." Reference is also made to MAFlink, a Christian missionary networking organization with HF, Satphone, and dialup services. They operate HF email networks in Congo, Mali, Haiti, Ecuador and West Papua. 9:34:15 AM