AXON PWM duty cycle?

[mstacho]

Just out of curiosity, if I use one of the PWM channels on the axon, what's the duty cycle, in seconds?  I ask only because I may have to do some software PWM'ing and I don't want to mix duty cycles...

MIKE

[waltr]

Duty cycle is measure in percent of the PWM period not in time (seconds).

What device do you need to control with PWM?
What frequency or period do you require?

[mstacho]

Sorry, I meant PWM period.  I calculate the duty cycle on my own as a percentage of the period as you say, but once I know what percentage I want (I evaluate it as a PD controller) I am now just multiplying by the maximum integer, which in my case is 255, which represents one full period for the 8-bit PWM.  I want to know what 255 corresponds to in seconds.

As for the device, it's just a bunch of DC motors.  I can't use servos because I need both position and force control, so it's PWM for me :-)

MIKE

[Admin]

You should use WebbotLib. My original Axon library is now obsolete.
http://webbot.org.uk/iPoint/37.page

You can set your period to be just about whatever you want, although resolution is limited to the 16 bit timers on a 16MHz processor.

[Webbot]

You should use WebbotLib. My original Axon library is now obsolete.
http://webbot.org.uk/iPoint/37.page

You can set your period to be just about whatever you want, although resolution is limited to the 16 bit timers on a 16MHz processor.

Servo software PWM requires 16 bit timers - but general pwm motor control can be done in WebbotLib using 8 bit timers.