Member Since: January 24, 2009

Country: United States



4th year EE student. Loves high powered lasers, making things with microcontrollers, and learning how stuff works.


Cal Poly Robotics Club Cal Poly IEEE Student Branch

Spoken Languages


Programming Languages

C, Assembly


California Polytechnic University, San Luis Obispo, California



  • Wow they still make this? This was my second soldering iron (first was a 60W fixed power firestarter that literally glowed red hot if you left it plugged in too long), and I quickly learned that temperature controlled irons are the only way to go. To start it up, I'd set it to 5, then as it warmed up, had to lower to 4 and around 3 for good soldering, otherwise it would get too hot and oxidize the solder too quickly. I wouldn't recommend this even if you are on a budget, do yourself a favor and get a nice temp controlled Weller or Hakko, you'll thank yourself later.

  • Took a while of frustrating debug to realize that my cable had a counterfeit FTDI chip in it; FTDI bricked it giving it a PID of 0000 but it still showed up in windows and spit out "NOT GENUINE DEVICE" or similar when receiving bytes over the UART.

  • What happens when 2 of these are close by each other, do they interfere?

  • I fixed your cable. Took about a half hour, some heatshrink, solder, and hot glue.


    Stub lengths are ~7cm, just a bit longer than 1/10th of a wavelength at 480 MHz. Android/high speed devices work just fine on it now, though I'm sure the waveforms are still less than ideal.

  • Thanks Sparkfun!
    I spent from 8am PST till 9:20am PST refreshing the page, watching Twitter and getting nowhere, so I took a nap till 10am, hit reload, and to my amazement, the quiz was back up. As quickly as I could I blazed through the quiz till I got a 6/6 (EE student, woo!) and had to skip the last 4 for time (that bar was FLYING towards the end). Certainly more successful than last year! I'm gonna split the winnings with my roommate, who was also up at the start.
    I hope this serves as a humbling experience regarding what your servers can handle. All that optimization + expansion didn't seem to help too much eh? I think I'll take my $20 loyalty money (and an extra hour of sleep) next year though.

  • These are amazing. It's only a matter of time before they can make these operate on their own with the kind of power that we're seeing in the processors of modern smartphones, and getting its position data from better IMU's + GPS. Don't forget that landing-on-powerlines charging system.
    Manhacks here we come!

  • Output impedance for the accelerometer is approx. 32k Ohms (from the datasheet). For the non-amplified channels of the gyros, it's 33k Ohms (from the schematic). For the amplified channels it's likely much less and probably insignificant to the input impedance of the Picaxe ADC. If you're worried about the accelerometer, you can buffer the signal with a unity gain op-amp/voltage follower.

  • This looks pretty cool, if several of these were storing energy for a while in a capacitor, it might be enough to change an E-ink display.
    By the way, any chance SparkFun will be getting E-ink displays in the future? That would be awesome!

  • Disclaimer: I own one of these, and it is kind of a piece of crap. Granted, it's the cheapest oscilloscope you can possibly buy, anywhere, so from that point of view, this thing is awesome.
    I'm not sure if they've fixed it in the newer revisions, but the front panel hole for the LCD is too small so you are going to have to route it out with a Dremel or other tool. Also, as soon as you get it, update the firmware to the latest version. The newer ones might be shipping with the latest firmware, but I know it made mine way better, it even upped the sample rate!

  • No, it's just one analog channel.
    You can find more details on the manufacturer's site:

No public wish lists :(