- update AWS schematic and PCB with PIC24HJ128GP502 uP.
  The processor is NOT used by AWS yet, but it will placed in the demo board, and I can try out it later.
  I2C, SPI, USART interfaces are connected already.
- tried to avoid the "possible STACK overflow" warning by moving the "PIC init" steps from a single function into the main loop, but after recompile the project, the warning still comes.
  So I will keep this changes, and I try digin what more can I do for solve this issue.