After reading @BDub post about hand-building some Spark Cores I decided to make my own with the layout slightly changed to suit my application. Now I find myself with an odd issue, after flashing the bootloader all I get is some rapid flashing cyan flashing cyan clip I thought maybe this was an issue with the keys not being present on the flash yet so I pulled the flash from my Spark Core and put it on my board, this didn’t have any effect. Any thoughts as to what would be causing this or where to begin?
My slightly modified schematic can be seen below. The three major differences is the support for HV input , a logic level converter to communicate directly to a 5V board, and a battery holder for the real time clock.