high frrequency PWM ,arduino

High frequency PWM signal

Use and Arduino Uno microcontroller board to generate a variable frequency variable pulse with PWM signal . The output pulse width should be adjustable , you can use an analog pin voltage varying from 0-5 V for duty cycle control (0 V should correspond to 0 duty cycle and 5V should correspond to 100% duty cycle). The frequency of the signal should range from 10kHz to 20 kHz and should be programmable .

i have a problem with the frequancy part, what i shloud do !

0 Robert Peter Oakes over 11 years ago

there are a number of registers in the Atmega 328 that allow control of the duty cycle (Compare registers) and also pre-scale registers that will control crude frequency ranges (A division of the CPU clock (none, 2, 4, 8, 16, 32, 64)

the two compare registers will control when the output goes high and low

timer C can be configured to work in 16bit mode allowing more refined control of the output

so one option is to use these registers to generate the output you need and allow the atmega to do other things

the other option is to use the timer to create interrupts at the frequency you want and then have the interrupt routine directly change the output pin using a simple delay function to manage the pulse,

A simple bit of math can factor for the pulse width to keep the frequency correct and to ensue the pulse width does not exceed the period of the frequency.

based on this explanation I hope you can put a working sketch together, if not then post what you can get going and ill help more with some examples of my own that i will create to aid you.

Peter
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0 Former Member over 11 years ago

CAN U PLZ GIVE ME EXAMPLES THAT CAN HELP ?
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0 Robert Peter Oakes over 11 years ago in reply to Former Member

Quick Response Day

I had a quick google, ended up on the actual Arduino Site and found this great article describing all sorts of PWM stuff including 16 Bit and fast PWM

http://arduino.cc/en/Tutorial/SecretsOfArduinoPWM

I hope it provides what you looking for
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