Last night, I finished preliminary testing of the V1.3 flight computer. The new design is intended to reduce the overall weight of the flight computer. The hardware was changed to now only run from a single battery rather than the dual power supply like V1.2.
Extra capacitor filtering was added across the PIC and the motor, and a snubber diode placed across the motor (should have been in V 1.2) The source of the PIC resets when the motor activated was also discovered - The PIC's reset on brown-out functionality was still activated. Turning this feature off solved the problem.
The whole computer and deploy mechanism will also be smaller to fit in smaller diameter bottles. Full details of the computer and deploy mechanism will be published once flight tested.