Black box number 2

I decided to use a arduino nano in this one.   Partly became it has the USB port for progressing,  but also had a 3.3v output.
Unfortunately,  it's only providing 2.4v which doesn't seem to be high enough to drive the network adapter.
So like like I'm going to have to add a separate regulator.

Decommissioning of power mon, Mark one

Poe temperatures sensor in a box

Radiator Balancing

I didn't have much time to spend balancing the radiators.  I read a couple of web sites and in the end decided to so it simply by turning down the lock shields and opening a quarter turn, then tweaking slightly to either increase the decrease the temperature differential.  The target is 20 degrees,  but I just held the pipes and looked for a noticeable difference.

Its a week latter and I have added flow and return monitoring, I notices that the flow temperature cycles, but interestingly this cycling is also visible in power usage.   Its off that I've not notices this before.

Import power( orange ).   Flow ( red )

Looking back through the history of my electricity usages,   I see when the effect starts.  9th Jan about 10:30pm - just the time when I balanced the radiators.

Import power ( orange )

So the question is; has balancing my radiators saved me electrisity?

Central heating update

Its been over a year since I had a new boiler installed, but I have finally got round to installing radiators in all my bedrooms.   It took a while to do.

Perfect sunny day

Weeks worth of data

Checking CT clamps versus the flash counting

The etched board

Board Layout

Arduino Electric Power Monitor V2 Circuit Diagram Schematic

The design uses 2 CT sensors and a voltage sensor which also does zero crossing detection which triggers an interrupt.