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dana
Member Since: May 7, 2006
Country: United States
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In addition to the losses from using a linear regulator (according to Lady Ada's Minty Boost Meta Documentation) 9V batteries have a much higher internal resistance than AAs, ~2ohms compared to ~0.3ohms. Moreover, 9V batteries have about 4.5Wh of power (9v at 500mAh) compared to 9Wh for 2 AAs (2 * 1.5V * 3000mAh).
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Publishing a magazine in addition to running SparkFun would be tough, but a column and/or regular project articles in Make magazine might be feasible. A lot of projects in Make are based on SparkFun products anyway.
After a couple of years the columns/articles could be collected into a book, eventually becoming a series of books. -
The Teensy and Teensy++ use the Atmel ATmega32U4 and AT90USB1286 respectively (http://www.pjrc.com/teensy/) and can be programmed with sort-of-mostly-Arduino-compatible firmware (http://www.pjrc.com/teensy/teensyduino.html).
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No, you cannot use these out of the box.
You need a U.FL to RP-SMA cable and an antenna with an RP-SMA connector (or a U.FL to SMA cable and an antenna with an SMA connector, but SparkFun doesn't seem to sell any antennas with an SMA connector). -
There's an very active subgenre of arcade enthusiasts, so I'm sure I won't be the only to suggest that if you're going to carry arcade style joysticks, you should also consider carrying some arcade style buttons, trackballs and interface electronics.
Just a couple of example links; http://www.xgaming.com/arcade_parts.shtml, http://www.ultimarc.com/JShopServer/ and http://www.u-hid.com/. -
For those of us who can't get to Hong Kong, there's always http://DealExtreme.com (prices include shipping).
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Just for reference, an instructable on how to make an RFID tag.
Unfortunately a 13.56 MHz tag, not the 125 KHz version.
http://www.instructables.com/id/RFID_Reader_Detector_and_Tilt_Sensitive_RFID_Tag/ -
This looks like the datasheet, http://www.p3america.com/pp/802.htm.
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Can you use a phase-change material instead of water?
http://en.wikipedia.org/wiki/Phase_change_material
I don't know if they make phase-change materials that work in the 120 degree range. Although I suppose you could use wax. According to this:
http://answers.yahoo.com/question/index?qid=20060911183537AAMm269
Bee's wax melts (phase-change) at 45C/113F, paraffin between 47C/116F & 65C/149F and carnauba between 78C/172F & 85C/185F.
No public wish lists :(