I've been reading about this subjects and for what i understand there are only 3 timers available (and probably we cant use them all)
What I would like to know is if it's possible to use a timer as an interrupt several times. The point is to have 7 pir sensors (one in each pin) and when one is active a timer would start for that sensor (and restart every time), and all sensors could be active at the same time.
First time I thought about this I was planning to use a RTC (calculating time diferences), but I didn't know about internal timers and interrupts.
I managed to figure out how to use 7 interrupts, but I cant interface that with the timers for each sensor.
Any help would be appreciated.