here i am sending you some of the links for servo motor check out
http://www.engineersgarage.com/articles/servo-motor
http://www.engineersgarage.com/embedded/avr-microcontroller-projects/atmega16-servo-motor-circuit
the above project for servo motor is done by using delay its better to do it with using PWM channel of AVR the below links shows how to generate PWM with PWM inbuilt channels in avr…
http://www.engineersgarage.com/embedded/avr-microcontroller-projects/fast-pwm-mode-timer-circuit