Car A/C Controller

After implementing CarPC my next thought was how well can I make use of the PC in my car,
and so came up with a USB device that can control car aircon. The device is build around
a full speed USB PIC 18F4550 microcontroller. Figure given below is the screen shot of the
software that runs in CarPC. One can set temperature using this screen, and the device through
a relay will switch ON/OFF aircon automatically, to maintain this temperature. Currently the
system uses single zone temperature sensing, as I have used only one 18B20 temperature
sensor. By adding more sensors this can be converted to a multizone sensor.

Get the schematics, source code and VC++ project code from the links given below

Visual Studio Project

PIC Source code