X10 Community Forum
🔌General Home Automation => Automating Your House => Topic started by: LeeCoburn on March 16, 2006, 12:47:29 PM
-
I'm trying to create an event that triggers to the second, and I'm not having much luck. It does happen sometime during the minute i set the trigger to. I would assume it's in the transceiver since an event every hour on the hour occurs at the exact same time to the second every hour.
Any suggestions?
-
There are so many variables which will not allow you to do this with any degree of reliablity! Noise,more than one module sent the same command, actualy any line activity just to name a few.! ;)
-
It's not clear to me exactly what you are programming. Can you expand a little?
-
I want to run an event, Basically turn on an appliance for 60 seconds every hour. I would like that event to happen on the exact hour right down to the second if possible. Or at least have the event happen exactly 60 minutes and 0 seconds from the start of the last event.
-
OK. For several reasons you will not be able to achieve the timing accuracy you want
if your schedule is downloaded to the CM15A memory. Is that what you've been trying
to do?
-
Yes that is what I'm trying to do. Should I run the scheduled events from the PC rather than from the CM115A Memory?
-
Yes, that ought to give you the same timing accuracy as your PC clock. Depending on your PC clock accuracy, you may need to update it from the web more frequently than Windows does by default.
I suggest you program individual timers for each On/Off event. (A delayed macro will be timed from the _end_ of the previous event rather than from the beginning, and an X10 On or Off signal takes about 1.2 seconds to be transmitted.)
(One of the main problems with running from a downloaded schedule is that the CM15A clock is maintained in sync with the AC line frequency. Barring a power outage, the power company attempts to keep this correct on the average, but it can swing back and forth a number of seconds during the course of a day or even an hour.)
Let us know how this works for you.
-
Ok I have to ask... What is it that requires such accuracy?