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I Dream of JNE

Member Since: September 10, 2011

Country: United States

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Check out what you can do with a Beaglebone and other open-source project ideas at http://knek-tek.me

  • I was thinking the same thing, here are the initial thoughts I was going to pursue: * How much voltage can a solar panel the same size as the edison boards provide? Is that voltage enough for this battery? * How much more power management circuitry does this require? Adafruit sells a board for that but it’s got some size to it due to inductors and capacitors and plugging 3 devices in (solar panel, battery, load). * For full sunlight how many minutes of sun are needed to power 1 minute of computing and wifi?

  • I was going to suggest the OLED screen board but I guess if the Edison has no way, via software, of knowing the battery level it’s a moot point. Even with some clever software to try and monitor power usage and estimate, that’d still be quite a bit of work.

  • Now that I’m trying to create a symbol for this in my schematic design software, I’ve got to say the pin numbering on the board is really screwy. Instead of labeling 1-10 on the left and 11-20 on the right, they just have their functional name. Even in the graphical datasheet. Also the picture of the underside of the board is flipped and rotated so it makes it hard to do a mental comparison of where the vias go, which pins are which, what the planes are, etc.

  • Thanks.

    Also from the schematic it looks like SPI SS pin is pin 15, but that’s not called out on the graphical datasheet. The graphical datasheet makes it look like it can’t support the Slave Select pin for SPI.

  • Two questions: 1) What is the max amount of DC and transient current deliverable on the 3.3V and 5V rails? I want to power a lot of chips from this board but I don’t know what the current limits are on the 3.3V and 5V outputs from the dev board.

    2) In the features list, what does it mean to have “All module pins broken out”?

  • Are you below sea level?

  • 2.2kOhm according to the datasheet.

  • In the future you’ll probably need to use pastebin or some other text sharing site to keep this formatted well (or heck use GitHub! <— best answer) and then link to that.

  • If you have devices that are powered at different levels, you should use a level-changing circuit in your I2C lines. Sparkfun sells one but you can also build one easily with 2 transistors. Look for I2C logic level shifting like this application note pdf.

  • Those values would vary tremendously based on your geographical location, and your location relative to lots of stuff around you. Inside of a building vs outside, near powered train tracks, near overhead power lines, etc. If you want to get an idea of what the magnetic field should look like around you, you need to use the International Geomagnetic Reference Field brought to you by the hard-working folks at NASA and NOAA.

No public wish lists :(