Hi, I have a Power Meter (NorthQ Power Meter) that calculates my whole house energy consumption by counting the led pulses in my analog power meter.

However the return is just the number of pulses (Watts) so in order to get the consumption I need to calculate the pulses between a certain interval (say 1 minute). And then multiply by 60 to get the watt hour:

*Time Watt Wh*

10:00 123456789

10:01 123456799 (123456799-123456789)x60

The value of the Wh i want to store someware to show in a graph later on. So questions:

How do I set a variable every minute?

I guess I need to set two variables to be able to subtract them?

How do I store the third variable (Wh) so I keep the history?

And how do I mark it so Homey recognise it as power consumption.

Thanks!

Pär