I need a smaller, “internal-izable” alternative to the mustache shield for powering my Spark.
I want my device to be chargeable and powerable through a micro-USB port, but stick to a 3.7v lipoly battery when not directly powered. Just like the mustache shield does, but I need this soldered in directly, to the VIN (or 3V3) pin, and in as tiny size as possible.
I was looking at the following SparkFun product: https://www.sparkfun.com/tutorials/379
Would it fit the bill? I’m not entirely certain from the guide if it can do both the powering and charging simultaneously.
Other possibilities would also be welcome.