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total device?

Posted: Sun Nov 29, 2015 11:29 am
by Edwin
How can i get a total device?
i want a device that has the total value of 3 other devices: device 1 is 12 watt ,device 2 is 30 watt, device 3 is 40 watt .
total device =12 watt+ 30 + watt + 40 watt=82watt
i dont know how to do that in an event
i make a virtual device called TotalUsage but dont know how to ad up all the devices together in an event.
can someone show me an example?

thanks
greetings
edwin