onof timer

[andrewwaack]

is there a way of making this code more accurate


main:
high portb.0
sleep 190 '3 minutes
low portb.0
sleep 190 '6 minutes
high portb.0
sleep 190 '9 minutes
low portb.0
sleep 190 '12 minutes
high portb.0
sleep 190 '15 minutes
low portb.0
sleep 2700 '45 minutes
goto main



thanks andrew

[Ioannis]

Without a timer chip? I guess not. The example by skimask is based on the watchdog of the PIC, which is innacurate by itself very much (look at 5.77 of the manual).

Another option might be the elapsed timer by Darrel Taylors Instant Interrupts. But, maybe too complicated for what you want.

Ioannis

[skimask]

is there a way of making this code more accurate

Learn how to use the TIMER interrupts...
Put the PIC to sleep using the sleep instruction, let the TIMER interrupt wake up the PIC, increment a counter to keep track of elapsed seconds/milliseconds/minutes/hours/whatevever, take whatever action is neccessary based on elasped time, put the PIC back to sleep.

[Pic_User]

is there a way of making this code more accurate thanks andrew

Hi Andrew,

Ski and Ioannis are right. Search the forum.

Take a look at Darrel’s Elapsed Timer Demo
http://www.picbasic.co.uk/forum/showthread.php?t=190
There is a lot of information, but you may be able to use the parts needed for your project.

How accurate does it have to be? Tell us something about the project.
-Adam-