PC Screen data flasher:

If a PIC is used for example in a timer application, such as a programmable clock timer, the majority of the circuit is taken up by the user interface with its switches, pushbuttons and display hardware. This expense can be avoided if the settings are entered via a PC, but operating the device is then made even more inconvenient by the required connecting cable. In this article, the author describes a simple interface that requires almost no additional hardware and allows a PIC application to be configured from the PC without a connecting cable.