Member Since: April 11, 2009

Country: United States

  • Yes, those are the right caps.
    Did you check for +5v and -5v on V+ and V- respectively?
    Did you forget to put a .1uF bypass cap on VCC? Are the other 4 caps are all wired up correctly? Ground on pin 15, power on pin 16?

  • Combined with a 0.33F supercap, you can get a full charge (3.9v) in one day.
    With that power, you can run a 10mA LED for 1 minute. Or power an ATtiny at 32KHz in Idle 24/7 and wake up to take measurements several times a day.
    Yes, you need to be very careful about power saving modes and leakage.
    No, it will not charge your LiPo minty-boost.

  • There is no switcher, this is a raw solar cell which is effectively a stack of diodes. It will output a voltage relative to the amount of light. Noon-day summer sun I got about 4.2 volts open circuit. Indoors at 5pm indirect light 2 volts. Night indoor lighting 0.4 volts.

  • I just read that Monster vs Vermonster article.
    Now it all makes sense. As Sun declines and Sparkfun grows, Sun is concerned that you might branch out and start selling servers and workstations.
    So this is just a ploy to get you to agree to not compete with them.
    How long does Sun have left? cash/burn rate - I don't have their financials handy, but you might be able to stall this long enough to outlast them, and thus hold your rights to the high end workstation market intact.

  • I hope you are taking this seriously and have a trademark lawyer representing you and responding to this.
    Sun may be on the ropes, but they, or whoever ends up with the Sparc trademark, will have the resources to make things very hard for you trying to defend your right to use Sparkfun.
    Despite your and most of your fans' opinions (I'm a fan too btw), Sparc and Sparkfun are indeed similar, and you are both in fields that could easily be considered related. You both sell electronics and "processing units", and the number of MIPS isn't relevant. You have open source in common as well.
    Some random judge without much of a clue just might be convinced by their army of lawyers to see it Sun's way.

  • So, to be clear, this particular wall wart is unregulated, maybe 14V open circuit, at or above 6VDC with up to a 300mA load. An good choice for projects with their own regulator, although you need to be careful.
    For example, a 3.3v Arduino drawing 100mA might overheat its regulator. The supply will be around 10V with that light load, so the regulator would be dropping 6.7v at 100mA, or over 1/2 watt. That's a lot of heat for a tiny, SMT regulator.

  • It would have been more convenient if you had the same pinout for this as the FTDI Basic. So both will plug into the Arduino boards directly. As it is, pwr/gnd are crossed!

  • Another option for plotting data is Ploticus:
    I've used it to plot weather data. Bubbles per minute should be easy. Sometimes I reformat the raw data by running it through perl, then into ploticus.

  • Data sheet says 70 ohms typical. Bandwidth will be limited by the output load's capacitance. Might work for video with short cable length. It doesn't look like they sized the traces for 50 or 75 ohm impedance, but the trace lengths on this tiny board are very short so that shouldn't be an issue.

  • They've just implemented this with a simple 5V jumper, and it costs $5 less!

No public wish lists :(