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The U49325 Sun Runner Stirling Engine is a solar-powered Stirling Engine which offers a dramatic demonstration of energy conversion.   This motor and its parabolic mirror can be attached to any conventional camera tripod. When properly aimed at the sun, the polished aluminum parabolic mirror focuses incoming solar energy on the heat cap of the engine, which is converted to rotary motion. Unit comes complete with motor, parabolic mirror, and wrenches. Standard camera tripod is not supplied. This engine is completely assembled and ready to run. Each unit is test run at the factory prior to shipping. Motor runs at 2,000 RPM and up. This engine can also run as a horizontal engine with an alcohol burner. Demonstrate this exciting method of harnessing the sun’s clean and renewable energy to your students.  Weight: 6.00 lbs Dimensions: Engine: 8.25 x 3 inches (L x W) Flywheel: 3.25 inchesParabolic Mirror: 18 inch diameterPlease note that this item is designed to demonstrate the operating principles of a Stirling engine for educational use and is not designed for power production.  It can potentially be coupled with a generator for producing very small amounts of electricity but is incapable of powering anything beyond a small light bulb or LED.

The Allwinner A10 CPU has been developed in, and is sold in, the People's Republic of China. Its mass-volume price is around $7, yet it is a 400-pin highly feature-rich 1.2ghz ARM Cortex A8 with a MALI400 GPU

What is My N3RD? My N3RD (Pronounced Nerd) turns your smartphone into a remote control for every gadget, vehicle and appliance you own. It works with the My N3RD app to upgrade ANY switch into a wireless controlled, programmable, and automatic smart switch, updating all of your devices into intelligent connected ones. Connect and control devices directly. No internet connection or router required.   Works with DC and mobile applications such as Cars, RVs, and boats. With My N3RD, you aren’t just limited to home appliances. Connects to any switch, enabling you to upgrade virtually anything— not just simple appliances like fans and lights. Simple setup. You only need to configure functions in the App once, and you can reuse them again and again. My N3RD is equipped with two relays and two inputs that can be used with external switches and physical switches to create a wide variety of uses. My N3RD is smart. You can program My N3RD to act without your intervention. Use the app to set timers for appliances and electronics. Although My N3RD has direct connect capability, it can also be connected through your home WiFi so you can control your devices from anywhere. Upgrade anything to an Internet of Things device.

Arduino Ethernet is a collection of libraries I have written to use within the Arduino programming environment in conjunction with the Ethernet shield. While the individual libraries are downloaded within a single archive, they do not depend on each other (unless noted otherwise) and can be used independently. The libraries are published under the GPLv2 (or, at your discretion, any later version). Individual libraries EthernetBonjour | Documentation EthernetDHCP | Documentation EthernetDNS | Documentation Also, by popular demand, I've prepared a very simple demo sketch using DNS, DHCP and Bonjour together. Basically, it gets network configuration data via DHCP, then lets you resolve DNS names via the DNS server received from DHCP, all while announcing its DHCP-assigned IP address via link-local Bonjour — Basically a combination of examples from the individual libraries, which I also recommend to look at, as they contain lots of comments explaining how stuff works.

Get a token to post a message using OAuth.

Add some Libraries to your Arduino IDE.

Download the Arduino Tweet Library and put Twitter folder into ~/Documents/Arduino/libraries (Mac) or My Documents\Arduino\libraries\ (Windows). If there is no such folder, please create it. Download the EthernetDNS Library from gkaindl.com and install it. Re-launch the IDE. Detailed information about libraries installation.

Socket Communications CompactFlash RFID Reader Card 6E ( RF5400-542 )

Product Details Integrated Type II CF card plugs into the Type II CompactFlash slot of Windows Powered Pocket PCs Reads and writes to ICode 1, Tag-It HF and PicoTag proprietary HF tags Reads and writes to the most popular HF ISO 15693 tags, including ICode SLI/SL2, LRI512, my-d and Tag-It HF-I High frequency, 13.56MHz reader/writer Add plug-in RFID capabilities to Pocket PC applications

$186.60

What is Scrapy? Scrapy is a fast high-level screen scraping and web crawling framework, used to crawl websites and extract structured data from their pages. It can be used for a wide range of purposes, from data mining to monitoring and automated testing.

Xerox was founded in 1906 in Rochester as The Haloid Photographic Company,[8] which originally manufactured photographic paper and equipment. The company subsequently changed its name to Haloid Xerox in 1958 and then simply Xerox in 1961.[9] Xerography, a modern word meaning "dry writing" developed from two Greek roots, is the name of the process invented in 1938 and developed by the Haloid Company. The company came to prominence in 1959 with the introduction of the Xerox 914,[10] the first plain paper photocopier using the process of Electro-photography, (later changed to xerography) discovered by Chester Carlson, which he developed with John H. Dessauer.

So NFC is just a method of communication between two devices at short distance. What makes the NFC antenna design simple or easy? If you know much about antennas, the first question you might ask is what is the operating frequency of NFC. It turns out that these devices operate around 13.56 MHz. The corresponding wavelength is 22 meters long - this means to get a nice half-wave dipole antenna (that radiates well) we would need a device about 11 meters in length.

he NFC antenna area may be limited to 3"x1" (or 7 cm * 2.5 cm). Hence, we are talking about fitting an antenna i

to a volume where the maximum linear dimension is about 0.5% or less of a wavelength. And from antenna theo

Ampere

The ampere (SI unit symbol: A), often shortened to amp, is the SI unit of electric current[1] (quantity symbol: I,i)[2] and is one of the seven[3] SI base units. It is named after André-Marie Ampère (1775–1836), French mathematician and physicist, considered the father of electrodynamics. Note that SI supports only the use of symbols and deprecates the use of any abbreviations for units.[4]

Newton (unit) From Wikipedia, the free encyclopedia Jump to: navigation, search Not to be confused with Newton scale, a rarely used non-SI temperature scale. Newton Unit system: SI derived unit Unit of... Force Symbol: N Named after: Isaac Newton In SI base units: 1 N = 1 kg·m/s2 The newton (symbol: N) is the SI derived unit of force. It is named after Isaac Newton in recognition of his work on classical mechanics, specifically Newton's second law of motion.

Coulomb

The coulomb (symbol: C) is the SI derived unit of electric charge. It is defined as the charge transported by a steady current of one ampere in one second: One coulomb is also the amount of excess charge on the positive side of a capacitance of one farad charged to a potential difference of one volt: