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how to determine required ppr for rotary encoder

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engkeat

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rotary encoder pic

in my design, the motor is required to lift up/down a base with a constant speed within 5-8rpm, i m using incremental encoder as the speed sensor and PIC-16f877A to control the pwm, the motor is directly connected to the base as well as the encoder, can anyone guide me in determine the required ppr ? do i need any interface between the encoder and the PIC?
 

determining ppr encoder

In Your application the ppr depents on how fast you want to control the motor.

Regards
Nandhu
 

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