Add Software Support for I2C GPS Sensor (Adafruit Mini GPS PA1010D)

[keenanjohnson]

Previous versions of the Frog Sensor have always used USB GPS packages due to their cheap cost and easy of use.

However, it would be a better engineering design to move away from USB to a different connector for GPS for two reasons:

• The decreased size - The USB connectors are large and always have an inconvenient bend radius which makes the enclosure large.
• The reliability - USB connectors don't tend to mate very reliably and generally tend to be one of the first things to fail in outdoor electronics.

The Adafruit Mini GPS PA1010D is an excellent candidate for a GPS sensor that uses I2C.

In order to support this, we'll need to modify the Frog software to read from either the I2C GPS or a USB GPS.

[keenanjohnson]

This tutorial from Adafruit shows the basics of connecting and parsing the input in Python..

We'll need to add that parsing code into this part of the Frog Software.