Generate 50hz frequency wave to control servo motor

[kalpana naruka]

hey, i am working on remote contrlled surveillance helicopter. To control sevo motors, i am using Phase correct PWM mode and i need 50 hz output wave frequency..is this possible using 6 or 8 MHz crystal.??

thanks in advance.

[AJISH ALFRED]

Hi,

It depends on the specifications of the microcontroller you are using. Please mention the details of the microcontroller in your project also.

[kalpana naruka]

I am using atmega328 having 28 pins. I know it can be done using 6.5 Mhz crystal easily, but unfortunately i dont have. so i want to know if it could be done with 6 or 8 Mhz crystal by choosing any appropriate mode in phase correct PWM or prescalar for timer0.

Thank u very much for ur attention.

[AJISH ALFRED]

Hi Kalpana,

If it works with 6.5Mhz crystal then ofcourse you can do the same with 4Mhz, 6Mhz crystal and 8 Mhz crystal by appropriately setting the timer registers.

Suggest you to use 4Mhz or 6Mhz crystal since you need long time period (20ms).

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