Solar iPhone ChargerApril 7, 2011
2. 6V 200mA solar cell
3. 3.7V – 7.0V LiPoly charger
4. 3.7V 2000mAh polymer lithium ion batteries
I followed the directions from Make available here. Basically you make a Minty Boost 2.0 kit from Adafruit and add a solar panel (also from Adafruit), battery and battery charging module from Sparkfun.
5/1/10 Parts ordered
5/7/10 Some parts arrive – start assembly.
5/11/10 It works! Finished assembly except for box.
5/15 Doesn’t work exactly. I can charge an old iPod, but not the iPhone 3Gs. May have to do with voltage levels on usb pins 2&3. More research is needed.
This seems like a good place to start researching.
6/16/10 Put project in a mint tin. Seems to work ok, but sometimes finicky about charging iPhone.
8/4/10 Works great! Previous problems probably due to not charging battery up enough. I have been using it for over a month now. The battery can be charged up to 4.16 v.
This setup works best if the solar panel is actually outside, not behind a window or screen.
8/8/10 Adafruit now sells all the necessary parts for this project and has a new version of Minty Boost out.
4/6/11 Still using it – works great. Usually let charge for a day or two before using depending on weather.
Click through for more pictures.