To solve the battery backup issue I designed a board that would run like an ATXRaspi (when paired with a Moteino), but in addition also have backup power from a LiPo battery. It acts as a charger/5V booster and can provide up to 2A for 5V loads. This is perfect for the RaspberryPi computer running the Moteino Framework.

I was able to get past the prototype stage and get a batch of these MightyBoost boards assembled. Here is a diagram of the various functions/pins on the board:

It has many uses (like charging your phone, or just act as a standalone supply for other 5V embedded systems). But mainly I designed it to be used with things like the RaspberryPi, providing a power button interface for easy shutdowns, automatic switching to battery backup when power is lost (battery is also charged while plugged in externally), battery monitoring and clean shutdowns when the battery runs dry.

Here is the MightyBoost details page and more will be added later. I need to upgrade the gateway computer to a newer Pi and also upgrade from ATXRaspi to MightyBoost. Stay tuned for more updates.