Do you frequently find yourself looking for odd-ball resistor values or soldering resitors together to try to get as close as possible to some uncommon E96 (1% resistor) value? If you make a lot of prototypes, you might be happy to learn that most major resistor manufacturers offer resistor ‘kits’ containing a certain number of every value. While they aren’t cheap, they do represent a fair value for the amount of work involved packaging and producing them, and if you’re really serious about electronics it can be reassuring to know that you have every value you might need.
To find different kits, you can search Digikey for some variation of this phrase: “res kit 1% 0805″ (changing the package size to match what you want), or here are the Digikey part numbers for some kits manufactured by Yageo (who typically have very competitive prices on their reels of resistors):
0805 1% Resistors (50 of each value):
0603 1% Resistors (50 of each value)
Join GE’s live 8-hour Ask Anything online conversation with leading innovators including Yves Behar, Tim O’Reilly, Bre Pettis and Andy Spade. Be a part of the event that celebrates GE’s $200 million ecomagination Challenge at ecomagination.com and submit to @ecomagination #AskGE
Chris Anderson from DIY drones is on right now, it’s on today for the next 5 or 6 hours.
Yes, this video is really short, but it’s stunning once you know what’s actually going on:
In the lab, University of Minnesota researchers show how a new multiferroic material they created begins as a non-magnetic material then suddenly becomes strongly magnetic as the piece of copper below is heated a small amount. When this happens, it jumps over to a permanent magnet. This demonstration represents the direct conversion of heat to kinetic energy.
Researchers say the material could potentially be used to capture waste heat from a car’s exhaust that would heat the material and produce electricity for charging the battery in a hybrid car. Other possible future uses include capturing rejected heat from industrial and power plants or temperature differences in the ocean to create electricity. The research team is looking into possible commercialization of the technology.
To create the material, the research team combined elements at the atomic level to create a new multiferroic alloy, Ni45Co5Mn40Sn10. Multiferroic materials combine unusual elastic, magnetic and electric properties. The alloy Ni45Co5Mn40Sn10 achieves multiferroism by undergoing a highly reversible phase transformation where one solid turns into another solid. During this phase transformation the alloy undergoes changes in its magnetic properties that are exploited in the energy conversion device.
During a small-scale demonstration in a University of Minnesota lab, the new material created by the researchers begins as a non-magnetic material, then suddenly becomes strongly magnetic when the temperature is raised a small amount. When this happens, the material absorbs heat and spontaneously produces electricity in a surrounding coil. Some of this heat energy is lost in a process called hysteresis. A critical discovery of the team is a systematic way to minimize hysteresis in phase transformations. The team’s research was recently published in the first issue of the new scientific journal Advanced Energy Materials.
This tutorial covers the low cost DHT temperature & humidity sensors. These sensors are very basic and slow, but are great for hobbyists who want to do some basic data logging. The DHT sensors are made of two parts, a capacitive humidity sensor and a thermistor. There is also a very basic chip inside that does some analog to digital conversion and spits out a digital signal with the temperature and humidity. The digital signal is fairly easy to read using any microcontroller.
Last week, we created a daily stats page. If you’re like us, then you compulsively click refresh on this page way too often! So lets AJAX-ify this page so that it updates automatically every time someone makes an order.
Dozens of tour buses have added the tiny town of Elma, N.Y., as a stop this year. On their way to scenic sites like Niagara Falls, these tourists are squeezing in a visit to the Made in America store.
Shop owner Mark Andol climbs aboard a bus and tells the riders that shopping here is a patriotic act.
“When you walk through them doors, I guarantee when you’re shopping — the homework’s been done — it’s 100 percent made-in-America products. Made in this country by American workers, and the money stays in our economy. So, enjoy yourself,” he says.
Customers pour into the spacious building, which used to be a Ford dealership. American flags and patriotic quotes adorn the walls.
Gloria Giesa of Vaselboro, Maine, says she always looks for “Made in the USA” labels when shopping. But this store saves her the trouble.
“Makes me think of when I was young and everything was American. And that’s the way it should be,” she says.
So far, principle hasn’t turned into a profit. Any money the store has made has gone into acquiring new products. Sales have doubled from this time last year, thanks to word of mouth and visits by out-of-towners.
Franchisees are already planning to open more Made in America stores, envisioning it as the next Wal-Mart — without the foreign goods.
NEW PRODUCT – DHT22 temperature-humidity sensor + extras. The DHT22 is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed). Its fairly simple to use, but requires careful timing to grab data. The only real downside of this sensor is you can only get new data from it once every 2 seconds, so when using our library, sensor readings can be up to 2 seconds old.
Simply connect the first pin on the left to 3-5V power, the second pin to your data input pin and the right most pin to ground. Although it uses a single-wire to send data it is not Dallas One Wire compatible! If you want multiple sensors, each one must have its own data pin! We have written an Arduino library with example code
Compared to the DHT11, this sensor is more precise, more accurate and works in a bigger range of temperature/humidity, but its larger and more expensive
Comes with a 10K resistor, which you will want to use as a pullup from the data pin to VCC.
NEW PRODUCT – DHT11 basic temperature-humidity sensor + extras. The DHT11 is a basic, ultra low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed). Its fairly simple to use, but requires careful timing to grab data. The only real downside of this sensor is you can only get new data from it once every 2 seconds, so when using our library, sensor readings can be up to 2 seconds old.
We have written an Arduino library with example code
Compared to the DHT22, this sensor is less precise, less accurate and works in a smaller range of temperature/humidity, but its smaller and less expensive
Comes with a 10K resistor, which you will want to use as a pullup from the data pin to VCC.
Eric Schmidt, Google’s executive chairman, believes that a third of check-out terminals in retail stores and restaurants will be upgraded to allow wireless “tap and pay” from mobile phones within the next year. Such a development will prepare the ground for what he believes will be a “trillion dollar” industry of mobile advertising and payments.
It won’t be in “most” places within a year, but it will be in high traffic places like Starbucks seemingly overnight. At this time Starbucks scans a QR-looking code with their current scanners which uses an app on the iPhone, but as soon as iPhone gets NFC we think Starbucks will add that at the same time, likely a joint-keynote thing with Jobs and Shultz. Android (Google) has the Nexus S with NFC and Google announced Google wallet, but it’s not slated to be out until “summer”. As of last week there is an official “scan the screen” app for Android too for Starbucks.
At first glance, these might appear to be normal 5 mm (“T-1 3/4″) clear lens ultrabright yellow LEDs. However, they’re actually “candle flicker” LEDs– self-flickering LEDs with a built-in flicker circuit that emulates the seemingly-random behavior of a candle flame.
In the close-up photo above, you can actually make out the glowing LED die on the left side, and a corresponding-but-not-glowing block on the right: the flicker circuit itself. In what follows, we’ll take a much closer look, and even use that little flicker chip to drive larger circuitry.
Erected in 1999 — with an accompanying smoke-spewing brick wall at its side — Metronome has long baffled those who lived or worked in the neighborhood, even when functioning properly. The digits are intended to display military time, forward and backward: the first seven numbers exhibit the time of day, in hours, minutes, seconds and fifths of a second; the last seven represent the time remaining in the day, using the same units. The middle digit, a collision of numbers overlaying one another from both directions, is a virtual blur to the naked eye.
For more than a year now, one of New York City’s largest timepieces has marched to its own beat, spouting nonsensical readings — 40 minutes slow, an hour and 10 minutes fast, 7 hours and 26 minutes slow — to mystified passers-by.
With updated programming software in place — from its inception until its malfunction, the clock had retrieved an atomic time reading using a dial-up connection, according to Ms. Jones — the artists are optimistic that Metronome’s technical glitches are behind it. At long last, they hope, the founding message of the installation, as a reflection on the passage of time, will resonate with audiences once again.
Early returns are discouraging.
“I saw this in the papers in Sweden. It’s the national debt,” insisted Ann Magnusson, a tourist from Stockholm, resting on the steps of Union Square Park on Monday afternoon. “China owns the U.S., no?”
The DareDroid is a biomechanic cocktail making dress that uses medical technology, customised hardware and human temperament to provide you with a freshly made cocktail.
The dress is created by The Modern Nomads (MoNo). The team consists of Anouk Wipprecht, a Dutch fashiontech designer that uses electronics in her designs. Marius Kintel, a hacker, tinkerer, and engineer based in Vienna and at the Metalab and Jane Tingley, a Montreal based artist who works with sculpture, responsive installation, and sound.
“Trumpet Marine 2″ by Ranjit Bhatnagar. This is such a simple and beautiful piece. Very summer-y.
I saw a firefly a few days ago, so it’s summer now, whatever the calendar says. Last weekend was the annual Figment Festival on Governors Island, and I brought back my 2008 wind-powered sound sculpture in a new cyborg body.