Member Since: January 27, 2010

Country: United States




  • I have the same concern about batteries fitting in this holder, because I bought some protected Gray/Black Ultrafire button top 18650’s on ebay and battery holders and they are way too tight. If you look at this picture, Sparkfun’s non-protected Li 18650 that doesn’t have a protruding button top smashes the spring nearly all of the way down. So I was just going to buy one of these holders to find out, but just doing this simple analysis proves to me at least that they will be too small for the protected batteries I have. YMMV though, my friend has some Red Ultrafire button top 18650’s that DO fit in the same holders I bought (which look exactly like these 95 cents on ebay). From memory, the wires are 22 awg stranded or smaller.

  • This is a VERY cool idea and I can’t wait to see what layouts people come up with! Thanks for putting this together :)

  • Just an update: I added a backwards compatibility option to the OLED library. This is mainly for Adafruit’s version of the OLED display from Winstar, but it defaults to the newest version which is what you have already determined works best for your display.

    Adafruit has merged my pull request, so these changes are in their master lib now. You can choose to keep linking to my fork for stability, or link to their master for changes that may come in the future (good or bad). Thanks!

  • Awexome to hear that this is helping you guys out ;-)

  • There is no power management. If you are powering the board directly from the arduino’s VCC pin, you should probably disconnect that power source when plugging in your FTDI cable.

  • That trace disconnects the 5V regulator, and it’s output 10uF cap, the VCC pin of the FTDI header and the power status LED. from the rest of the circuit. You will not be able to reprogram your circuit without powering the unit from batteries directly on the Arduino’s VCC header pin. You’ve also lost some of your 5V stiffening/decoupling… not too bad if you are not doing anything noisy with the circuit, especially since you are running on batteries. However, I think just providing a solder jumper for the power status LED is the thing that will really matter for current draw. (5V - 2V) / 10k = 0.3mA assuming it’s a red led. I can’t imagine there is much current back-feeding into the 5V regulator, but you’d have to check.

  • Since you are using the Adafruit_CharacterOLED Library, you might want to look at my pull request and determine if your display will have similar but solvable issues: https://github.com/ladyada/Adafruit_CharacterOLED/pull/5 I would recommend trying it with and without my fix as they may be updating their library with the fix at some point.

  • Nice, are they for sale?

  • I realize the L6470 is $5, but $35 for this is kind of steep considering it takes at least 3 of these to start having any kind of serious fun ;-)

  • Just dim the backlight and wake up with a touchscreen tap. I did this using the Adafruit Touch Shield and it works great.

No public wish lists :(