I've been working on a custom PCB for sometime now and finally have something to show, I'm using this as a way to document my progress. Let me just say that it's been some fifteen years since I last designed a PCB and I'm a software engineer by trade (well so people would have me believe) :

The PCB above is of my own design using the LPC1768 as the MCU an FTDIRS323 to USB converter and a small amount of I2C memory for parameter storage. I designed the PCB using information from the reference design and layed it out using the Eagle PCB design software. The board was manufactured/assembled by PCBTrain.

Eagle schematic of the minimum parts of the reference design I needed to get started (right click and choose save as) /media/uploads/ScubaBoy/basicreference.sch

The main purpose of the PCB is to drive a TFT display. You will see that I'm using my development mbed as the programmer.

Progress to date:

• Able to program the MCU.

• Verified RS232 to USB converter works correctly.

• Verified control pins are correct.

Revision 2 of the board arrived yesterday (Newbury Electronics have done a cracking job again) number of improvements over the initial design.

Whats new:

• Micro SD card socket for storage,
• Single cell lithium ion battery buck boost and charging circuit (top right)
• Battery backup for RTC.

Improvements:

• Reduced board size.

Items yet to be added/removed:

• Mbed drag and drop programming interface.
• Remove ISP programming connector.

Latest update of the board with the mbed interface :)

and TFT display mounted

Mbed enabled display board schematic /media/uploads/ScubaBoy/example.pdf