If your desktop computer lacks a webcam, you can try out using your Android phone as a webcam. DroidCam can help you turn your Android smartphone into a webcam. Created by Dev47Apps, the application is currently in beta. DroidCam 2.0 is a Windows client program that must be installed on the desktop or laptop that you wish to use with your Android phone. You also need to install the application on your Android phone from the Android Market.

More details on how to connect your Android phone as webcam is available here. Your Android phone version should be 2.x, older versions are not supported.