Arduino 3.3V and LiPo UPS
i'm looking easy , smart 
way have 3.3v arduino pro mini 1 little lipo (1 cell - 1s) embeded, acting ups.
lipo must on charge when external power (from dc or usb) available , feeds arduino when dc or usb unplugged. of course, arduino mustn't turn off in meanwhile!
i know olimexino , same arduino pro mini.
i don't want use shield. must cheap solution. found couple of ics useful: max1551/5 , ltc4071.
has worked on matter?!
way have 3.3v arduino pro mini 1 little lipo (1 cell - 1s) embeded, acting ups.lipo must on charge when external power (from dc or usb) available , feeds arduino when dc or usb unplugged. of course, arduino mustn't turn off in meanwhile!
i know olimexino , same arduino pro mini.
i don't want use shield. must cheap solution. found couple of ics useful: max1551/5 , ltc4071.
has worked on matter?!
one solution battery charger adafruit sells. you hook battery up, , if there external power, uses charge battery. you can charge while arduino running. adafruit sells 3 different modules of charger can power chip while charging batteries:
the chip adafruit uses first link mcp73861. the mcp73833 new replacement mcp73861 (the biggest difference seems mcp73861 can use input voltages 12 volts, while mcp73833 can use voltages 6 volts, limits other boards come from).
- http://www.adafruit.com/products/280 - can charge battery mini usb plug (5v) or 2.1mm dc adaptor (5-12v);
- http://www.adafruit.com/products/259 - can charge battery mini usb plug (5v);
- http://www.adafruit.com/products/390 - can charge battery mini usb plug (5v) or 2.1mm dc adapter (5-6v). this designed charged solar power , automatically draw current possible panel in light condition.
the chip adafruit uses first link mcp73861. the mcp73833 new replacement mcp73861 (the biggest difference seems mcp73861 can use input voltages 12 volts, while mcp73833 can use voltages 6 volts, limits other boards come from).
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