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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 bought this along with some LiFePO4 batteries, only to discover upon closer reading of the datasheet that this device can only work with batteries whose chemistry lets them go up to 4.2V. Unfortunately my project requires LiFePO4 which has a max voltage of 3.6V! There is no way to modify the output of this device to intercept the 4.2V and drop it down to 3.6V without making all the other features of the device basically pointless. Glad I read that before plugging it in to those batteries.

    For anyone who's curious about the differences in chemistry, you should use a LiFePO4 chemistry for use-cases where the device will mostly get power from elsewhere (like the wall) and the batteries will be sitting at full charge for long periods of time without being exercised. LiFePO4 doesn't mind sitting at full charge for long times, unlike other lithium chemistries which will degrade faster if they're not exercised and if they're kept at full charge. (Don't keep your phone or laptop at 100%! Cycle it every day and let it "die" every once in a while).

    --> Sparkfun: Please note in the product description that this device is ONLY for use with batteries that have a max voltage of 4.2V. Other lithium battery chemistries with lower voltage maximums will not work and will experience an over-voltage event if they're used with this.

  • Would I be able to use the Adafruit GFX Library with this?

  • The 555 timer can be used for a boost converter to take the 5V from a USB port and boost it up to 400V-600V! What's this useful for? Well, you could power a Geiger-Muller tube and detect radioactive hits. And maybe use that signal to pulse some Christmas lights on and off, visualizing the heartbeat of the cosmos as cosmic rays hit your Christmas tree: http://knek-tek.me/index.php/2018/01/09/radiation-controlled-christmas-lights/

  • Will Sparkfun please do a run-down of these many, many IoT dev board options and clarify what the intended use-cases look like for each, and how they are all distinguished? There's this product, various raspi options, the gadgets that Intel made like the Edison (before Intel withdrew from the maker market), the Teensy boards, and on and on with dozens of shields for each of those.

    So many options for an IoT dev platform! What are they for! What niche does this product fill that wasn't already filled by all the other extremely similar gizmos?

  • If the cap only has a 2.7V rating then you would need two in series to use with a 3-3.2V bus.

  • Seconding this. The storage space and dynamic memory need to be listed in the specs.

  • Section 6-4 of the datasheet says that with no display update, it draws 6uW, so that implies that unlike a non-hybrid e-paper display this thing can NOT keep the image after losing power. So not good for a very low-power system. :-(

  • I tried reconditioning mine again in an actual humidity chamber and it worked. I must not have had the right conditions before.

  • Unfortunately after spending nearly two years in storage, my sensor no longer works, even after placing it in a very humid container for a day. It is stuck in Diagnostic mode and only gives RH=99.94%, Temp=124.98, no matter what. :-(

    Is it possible that one of these cannot be reconditioned and I have to throw it out? Your guide says >50% RH for 5 hours, which I did.

  • In the figure where you show the capacitors hanging off the Vin pin, and you had to use a diode to prevent backflow into the solar panel, you could instead put the capacitors coming off the Vcc pin (Vout on the actual chip) and like Fig 11 on p. 16 of the 3588's datasheet you would NOT need a diode. The LTC3588-1 is able to have huge capacitance on its output without the need for a blocking diode...apparently. Haven't tried it myself.

    Am I wrong?

No public wish lists :(