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Member Since: February 3, 2009

Country: United States

  • Voltage only. You supply the juice, this little guy will supply the noise!

  • Enough to fill a house? ;-)

  • At power-on, all I/O pins are configured as inputs.

  • Unfortunately, we don’t have a data sheet for these. A data sheet probably doesn’t even exist for them.

    SparkFun doesn’t manufacturer either of the USB battery packs for the Spectacle kits. They are essentially “off the shelf” USB power banks that we were able to obtain at a good price from a manufacturer. The status LEDs can’t be disabled, but likely only consume a few mA of current when active so they wouldn’t have much of an impact on battery life anyway. The status lights only come on if you have a heavy load on the output so for low current use, (like with Spectacle) they won’t ever be an issue.

    At light / no loads, voltage is always present. We don’t have schematics for these, but from watching the output on a scope, it appears that there is a capacitor across the output that gets charged up and is monitored for voltage. When the voltage falls below 5 volts, a DC boost converter very briefly comes on to top off the cap and maintain voltage. When you’re using these with a low current load like a Spectacle Director board, the boost converter comes on more frequently, but the pack never activates the boost converter full time.

    I have not tested an over-current condition with these, but similar packs I have tested automatically limit current to 1 amp. I have plugged my 2 amp phone into one and it charges slower that if I charge at 2 amps so it looks like these are limiting current to 1A automatically. The charge pump inductors DC to DC converters eventually saturate and don’t have the ability to deliver more than their rated current protecting the entire device.

  • This Dissolvd Oxygen Probe can be fully submerged in fresh water or salt water, up to the BNC connector indefinitely.

  • Pins 5, 6, 9, 10, & 11 are all PWM pins.

  • It is possible but very difficult unless you’re good at soldering fine pitch SMD parts. (The pins on this module are very small and close together.) We have the same module on a breakout board that might be easier for you to use.

  • We don’t have plans for a Si4777 breakout board unfortunately. Even if we did, the licensing costs associated with HD radio would probably make a breakout cost somewhere north of $100. Until the company that owns the patents on HD radio releases details on how to decode their CODEC without paying a fee, you’re never going to see a HD radio receiver in the hobby electronics world.

  • You can power the board from USB through the USB socket. The 7-15 volt limitation is only if you use the barrel jack that’s to the right of the USB socket.

  • Not sure about the one in the picture, but the build list for this board has a 220 ohm resistor in it and no 1.2K resistors. Rest assured the product we actually ship has a 220 ohm resistor.

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Sewing kit two

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