I’m using the K8015 in “Interval Timer” mode. The load is ON for 10h and OFF for 14h (the whole cycle is 24h, 1 day).
I set up the ‘delay1’ and ‘delay2’ carefully, using the “Learning Mode”, with an accuracy of +/-1 seconds.
Though, during real timer operation, ON and OFF periods have some drift. 15 seconds per day is a typical time drift, but I get up to 1 minute some times. I tried setting delay times several times, but the accuracy I get is always the same.
Is 15s within the expected accuracy of the PIC internal clock, or should I expect something better? Could this drift be explained by room temperature changes (no more than 7°C)?
Is there any improvement I could do to have better timing control?
This is normal (internal RC operation, can be up to 5% off).
If you application is that critical, you need to look for a different timer (sorry, not available in our range).
Thank you for answer.
My application is the automatic light for an small aquarium, so 1 minute timer mismatch is not an issue. The K8015 fully meets my expectations!
I was just trying to get the best from my setup.
I find the 5% internal RC discrepancy a bit high. In my particular application it might mean more than 1 hour delay! (I’m actually getting 0.1%).
Going beyond the scope of the K8015, I guess that the accuracy could be improved by using an external clock for the PIC.