MikeSharp01

Well I never thought I was that clever but maybe I am by comparison to some - oh that's how IQ works, now I get it 😂.

Then they clearly have no understanding of number.

I suppose there is a chance that you have hit the sweet spot? I wonder how the ASHP is cycling do you have any details of that? Sorry if I don't recall your upstairs temperature management systems but you, and others, talk about it getting a bit warm upstairs over the past heatwave. So I have been looking at cooling for upstairs in our build but I do wonder if some sort of stirring system to pick up air from just above the slab or push warm air down to the slab (EG simple convection) might be a way forward.

Leaf blower it into a shed or some such then scoop it up from there?

Some might say worst thing that happened, others might say the best thing that happened - but mostly nobody noticed which in itself was a shame but generally the way of things. ‘THE PAST IS A FOREIGN COUNTRY: THEY DO THINGS DIFFERENTLY there.’ L. P. Hartley. Which I guess is why building control is very different today. We are actually all over the place - and like @SteamyTea we sometimes move about a bit, none the less you are very welcome to THE forum for people like us.

Just show them the patent - ?

So he wrote it up and started a fad.

12.5 billion years ago in a universe not far from here......

It's on but only a dribble, this is going to bite us all in the bum, another good reason not to expose your bum by pushing your head into the sand.

Sorry just did that and I found a whole slew of senior politicians already there - no room for me.

Yep - that's a worry - think I will find some sand and stick my head in it.

Now I must finish my trustee report - sometimes life interferes and not capacatively.

Bugger me, just looked at the tracks above the board taking SDA and SCL from the RTC to the WEMOS lovely and parallel - so thought nice capacitor there, so bent them apart - see pic, works like a dream - dry joint or interference?

Yes, thanks for the heads up on the boot pins - had the GPIO15 with a pullup for the pulses. That has cured the boot from reset switch but the rtc is still error 4 - bus arbitration fault. (Nothing else on the SDA / SCL pins I can see.)

I have moved on and found an interesting bug. If I run the RTC on a nano it works fine, then I transfer it to the WEMOS, first run is fine but next upload it breaks and I get error 4. So for now I will put the RTC on the back burner and work on getting counts back to the server. See if can remember enough Node Red to get that going with MQTT from the device. Might be fun but no more time today. Chores🤨

Yes I thought of that but if I2C is not working then other things won't work and I need to have it available as I want the block to be universal - I have a few other I2C devices so I need to try them and see if it's the RTC, the library (which may not have been extensively tested on the ESP8266) or my circuit / associated capacitive issues. I have played with MQTT on it and thought I could use it to provide a time to all the subscribers so I still keep time if the internet is down.

Ok so I have been working up a ESP8266 based equivalent of the Steamy counter. Although it broadly works I am having a real struggle getting the RTC to work reliably. Technically I don't need it as the receiver end could do all that, I could use the millis() functions to create quite good timing and I need that anyway to measure the interval and get a rough idea of instantaneous KWh. Could do this better with the 32KHz pulse train from the RTC if it was enabled on the boards I have - same as Steamy's. I have tried a slew of libraries but I still regularly get a bus conflict error on all three of my RTC chips and they all behave perfectly on an Arduino nano. As the RTC is currently managing the sensor timings - I put a DHT22 on the board as well for fun, I guess I need to fish out my logic analyser and look at the timing on the I2C to see whats going on although the scope would show me if the edges are fuzzy / noisy. I decided to echo the flashing LED on my sensor and made a bracket I can just tighten on the meter so nothing is actually fixed to it. So work still in progress I guess.

Very well, just conditioning the photodiode and getting the code working, just can't decide where to split the client / server activities. Might get to share something tomorrow.

Absolutely - just need to work out how to use it in reverse so as to get accuracy both ways. Simple question with a complex answer - did we already discuss this? Why not get another meter and connect it backwards so it flashes on export!

So really the energy monitor using the red light is not going to be universally useful but will work in non export situations or we need to add more features / intelligence to get a more universal solution.

Why would it come on if no chargeable current is flowing surely each complete pulse is 1Wh so turning it on and leaving it on means more than nothing is happening. Unless it comes on at 90% (or some such) of 1Wh expecting it to fill shortly but it does not. So then the falling edge is the full 1Wh and on means almost there - seems daft though.

And presumably the lights on?

We have LPG heating here at Millstone Manor and it has a standing charge - they call it tank rental or some such but same thing in the end.

These threads are getting mixed up. I redid the sums and I think that I would need about 3.7Kw of cooling to achieve that but if I drop the delta and the ACH it obviously comes down dramatically (proportionally). Looking around this unit (https://www.paulheatrecovery.co.uk/wp-content/uploads/2020/07/ComfoPost-CW6-PAUL.pdf) will almost get to the above, assuming the ASHP can cope.

Thanks - that's all interesting but I don't think any of them will fit in our void, I also would need to plumb the condensate out and, because we don't want to bring outside air in, other than via the MVHR, we would need to recirculate which looks like it adds to complexity somewhat! I think I am going to look harder at getting the MVHR boost to deliver a modicum of cooling - if I get ahead of it I feel, just gut feel, we might achieve it so I need to get back to the sums. See this thread: