Here is a snapshot of the revised design which uses an Amtel CPU to receive the I2C commands, monitor the key-buttons, as well as drive the LCD. There are plunty of Arduino modules out there to use as building blocks, for the LCD, the keypads, and the I2C in Slave Mode.
|Notice how it is just a bit larger then the LCD itself|
I have ordered a PCB via Batch-PCB, and the parts from Mouser. Will take over a month for them all to come in, and I expect to be playing with this over the summer. Until then, will be just using the current 'Back Pack' v0.1.3 PCB and design.
But, this could be yet another fun project!