Timer PWM - with different on and off cycle times

(3 posts) (2 voices)

vfr800nut
Member

Hi All,

Probably a complete noobie question but here goes.

I noticed timer PWM mentioned in this thread,
http://forums.leaflabs.com/topic.php?id=1222#post-7400

I'm looking to turn 4 different relays on for x milliseconds then off for y milliseconds. where x != Y. My present solution is using timers 3 and 4 with 4 interrupts on each, 2 on and 2 off via digitalwrite.

Can the on and off times of timer PWM be allocated seperately to generate the required square wave (600-9KHz)?

Has anybody got a more elegant solution for this ?

Thanks

Posted 2 years ago #
ala42
Member

You can specify the period of the timer and can specify the high time for each of the timers for output channel.
I hope you do not try to pulse mechanical relays with 600Hz or more.

Posted 2 years ago #
vfr800nut
Member

Thanks

No, not pulsing mechanical relays. Looking to use optoisolated MOSFETS instead, much better to drive an ignition coil with :)

Posted 2 years ago #

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