need audible pulse out that varies "on time"

[Jerson]

The way I would do it is to implement a soft PWM. I think it's been covered on this site already. Let a timer run in the background every mS. Give it a value for on time of the buzzer (0-1000mS) Every time the timer ticks, you can verify if the buzzer needs to be on or off. Now, all you have to do is give it a value from your mainline code.

[MUC]

jerson,

why soft and not HPWM? Honestly I'm not fully getting this...

Mark

[Jerson]

MUC

Frankly simply because I'm so used to it by now, I've never had to do the HPWM. I do a lot of temperature controllers with cycle times in the range of 1 to 30 seconds. So, ..... It's more a matter of personal taste.

Jerson