The controller has been implemented using only proportional and integral control. The derivative control likely not be required Below is a graph of output voltage of the switcher with increasing input voltages. Under minimal load this will need to be tuned to respond appropriately for give step sizes and output loads.

The ability to switch the output voltage on and off is given by the menu. Two commands are available to enabled and disable the switcher. This along with the PID controller itself has pushed the project over the 1KB limit.