This detailed technical article by Pramode C.E. describes a simple application developed by Pramode's students using the Real-Time Application Interface (RTAI), a platform for developing real-time applications with Linux. Part of a computer vision project, the application controls a servo-attached webcam through a browser interface.

Pramode's students were inspired by the famous “Cat Cam” article by Cort Dougan: Creating a web page controlled 2-axis movable camera with RTLlinux/Pro.

The article contains much sample code, and covers:

• Controlling the servo
• Using interrupts
• Measuring pulse width
• Semaphores and Priority inversion

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