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rsp

Member Since: July 23, 2007

Country: United States

Profile

Role

troublemaker

Programming Languages

all

Expertise

Creator of the Colorganic Spectralizer and Colorganic Spectralizer Kit (Sparkfun product KIT-10446).

Interests

meh

Websites

fearlessnight.com

  • Product COM-12022 | about 7 months ago

    This LED strip has no ws2801’s, just plain old RGB LEDs. Although there’s no voltage rating stated, it looks like you give these strips +12V and then pull the lines for the color(s) you want to ground. These strips can be cut into any multiple of 3 LEDs. A full 5M strip would pull about 6A at 12V with all LEDs on full.

  • News - We Have It In Stock | about 8 months ago

    I call statistical shenanigans. Many of the parts listed by Digikey & Mouser are variants of the same part and are not intended to be normally stocked, so the in-stock rate of parts that Digikey & Mouser intend to actually have in stock is much higher than 30%. And I’d expect the Sparkfun stock rate would have to be even higher because many of Sparkfun’s products are unique and don’t have alternatives, so if it’s out of stock you’re out of luck.

  • News - New Product Friday: The R… | about 9 months ago

    There are several things that make cublets expensive; they are high quality, made in the USA, patented, and just starting to ramp up to large quantity production. Although they are hackable (they can be opened with a screwdriver), they aren’t open source; but maybe Sparkfun can make that happen like they did with littleBits. With “cublets code” (a web-based compiler that’s in it’s infancy right now) the cubes can be reprogrammed via the bluetooth cubelet. So there’s a lot going on behind the cublet product, and it all costs money.

    As far as prices go, their RCR123A batteries are a little high, but otherwise their pricing seem reasonable. Buy cublets from the manufacturer’s site and get free shipping during August 2013.

  • News - Engineering Thursday - 3D… | about 9 months ago

    Careful now, the Sparkfun Spork is a classic design. Of course it could be improved by adding a couple of gunsights and a ‘328 processor, but that’s obvious. The bottle opener works great for me; although the bottles I open are mostly screw top type so I dunno if that means a lot. But seriously I do like Blueblast88’s idea of adding some engraved ruler markings; other than that, it’s often unwise to mess with a classic design unless there’s a really significant improvement that can be made.

  • News - Open-source hardware comm… | about 9 months ago

    I’ve heard about these guys; to be a member I think you have to wear a fedora.

  • Product COM-11783 | about 9 months ago

    Static tests with my uncalibrated cat were inconclusive, however the measured surface resistivity is greater than 100 MOhms, so it’s not antistatic or dissipative type plastic.

    Not shown in the dimensional drawing, the compartment depths are 1.73" (front) and 0.5" (back). The lids fit well, but could allow tiny (e.g. SMT) parts to escape.

    This is a great case; the only improvement I can think of would be to add a fold-down style carrying handle.

  • Product COM-11821 | about 9 months ago

    SF lowered the price after my comment. Whether it ’s a product listing error or responding to a call for competitive pricing, I’m happy whenever SF offers the best products at the lowest prices.

  • Product COM-11821 | about 10 months ago

    Adafruit has had these for a while, and they cost less. They have nicer (and cheaper) breakout boards for these too.

  • Product SEN-11836 | about 10 months ago

    The pads marked J1 are for a USB connection; the pinout is:

    • Pin 1 (square pad) = +5V (usually the red wire in a USB cable)
    • Pin 2 = D- (white or yellow)
    • Pin 3 = D+ (green)
    • Pin 4 = Ground (black)
    • Pin 5 = Shield (optional)

    To use the SDK_DEMO.exe program over USB it must be the version for the C1 model, which is here.

  • Product SEN-11836 | about 10 months ago

    You can connect the UART transmit and receive lines directly to a 5V ATmega328 Arduino. The GT-511 transmit level is 3.3V (measured), which meets the ‘328 input requirement of 0.6*Vcc. The GT-511 receive pin looks like it’s 5V tolerant, but they don’t explicitly say that, so I’d put a 5K resistor in series just for extra safeness (this is the configuration I tested, and it works fine).

Name Pieces Total
Engineering Roundtable - RFID Garage Door "Open Sesame!"
The major parts for Joel's RFID garage door opener.
6 59.7