Good suggestion Jumper however I work at an Australian university, all of which have suffered savage government funding cuts over the last ten years. I have 100 of the 18F4550 from another department available and the project cost is already too high. The PCBs have been ordered and the 4550 is pin for pin except RC3 which is not used in this design.

I intend to make the 4620 the 'standard' microcontroller here as I can then retrofit numerous projects with extra features and relax about tight memory for future projects.


Brian