Interesting observing the lag between external and internal temperatures on my extended prototype SkyPiAQ air quality devices.

Five Test SkyPiAQ devices 01/07/2022 to 06/08/2022

A little python and matplotlib script I wrote to plot the data from my test devices for any period available in the database.

First thing to note is the massively varying plot on each graph is the external sensor box I also designed using the awesome software engineers cad program “OpenSCAD”, the enclosure design exceeded my expectations, still water safe after almost a year bolted to my shed. I went for a completely exposed base which I figured would get better airflow and allow draining of any liquid and an inner “keep” wall as well as the external vented wall.

Anyway you can see the four internal sensors are all pretty much in agreement, though aqkit went through a period in the kitchen that had better air mainly due to the airflow in the kitchen, and so that actually tracks the external sensor at certain periods, but then also worse air at times whilst cooking.

All sensors in agreement over barometric pressure.

As for the actual temperature reading, the external box is a thin pla 3d printed box mounted on a metal shed, so, kind of a temperature amplifier I would say! The Stevenson screen is key to the thing eh! same wood, same dimensions, same residual humidity in the wood, sealed with N layers of a specific paint… same sensor position in the box, same altitude from the ground, same ground surface (grass, not a Heathrow runway LOL) etc. etc. A very important component! The Enclosure. As for internal temperature think I have not accounted fully for digital self heating yet, need a reliable accurate mercury min/max thermometer and humidity meter for calibration.

You can also see why any air quality algorithm has problems pitching “OK” air when it varies so much in an external setting like this urban yet rural area. The problem for internal sensors is opening all the windows for a day makes all the other readings appear so bad on a linear scale.

Anyway if anyone wants to buy one you can add your name to a list, but the raspberry pi is currently as rare as rocking-horse shit so… a problem…

The Executioner Fly Killer

The Executioner Fly Swatter

Personally I think they over-egged the title a bit, I would call it “The Stunner” though earlier today this fly actually did seem to explode when swatted about 1-2cm from a reflective surface, which you do not want… and rarely in practice happens, that was some strange Newtonian acceleration thing I think…

Anyway, had mine a good couple of years now and at this present moment in time over constant assault over last few days I think I have liquidated pretty much the entire local fly supply!

The loud “crack” as the fly hits the surface is very satisfying, but do not be fooled!, the fly is probably only stunned, still got to locate and flatten the thing afterwards…

I mean the little cluckers will be back up and giving it the “I’m super-fly, can’t touch me” attitude shortly. They never learn and decide to fly away.

I learned to appreciate the subtlety of Tai Chi using it LOL, the blend of slowness and quickness! I guess it’s the technique of the global corporat-king usurer creeping up on you eh! And the executioner is the legal-system they implemented for themselves eh!

On further contemplation, rather like the appearance of nato creeping up on russia, the “fly” now has to make its move, (you have to understand the dynamics of what a fly is capable of doing, its position vs. your angle of approach with what is basically an electric spiders web) ideally straight into the bat, but the global corporat-king usurer is such an elusive and really very untouchable fly that they are also playing russia as potential emergent dominant in their new world order. I mean they plan to profit off war for a decade or so eh! Whereas I would like to see them be so hungry they try and eat their own vast quantities of money…

I mean so much so are the international corporat-king usurers hedging their bets that in all the thoroughly infiltrated western states they are actually depleting the arsenals of the “western powers” standing armies to support ukranians charging head first into a wall eh! With the actual weapons supplied going who-knows-where eh! via the darknet back to their own bunkers/redoubts cheap, having profited already off selling them to the western governments in the first place eh!

I mean that footage of biden doing crack and wanking at a so called rehab clinic is like… ultimate cognitive dissonance, almost like the proles are cheering him on LOL

Anyway, whilst the bat is quite tough, don’t go swinging it around aggressively, easy to catch your own household objects in your attempt to swat the fly.

verdict – BIG THUMBS UP

A great story about politics!

Bit off topic I know, but this is very good indeed. Maybe not off topic as in fact it is kind of about Heavenly level politics LOL

I think the crucial thing about this series is, it relies on a supreme authority (King/Queen/Emperor/Whatever) that is more interested in “higher things” than debauchery and money.

Of course debauchery and money are very attractive. And positively promoted by all western media!

And I would add I think “debauchery” is more than sex, drugs and alchohol, these holier than thou bunch of the vaccine drive, or the “global warming” bunch with an actual, would not be fair to call her a “tard”, as their figurehead, are as debauched with “groupthink-righteousness” (and actually probably also in a lot of cases also sex and drugs and alchohol and food or some other vice like seeking a genuine “damien hirst pig in makeup” or whatever).

New four cell 18650 “V9 battery shield” from China, is better than expected.

I received a new four cell battery holder from AliExpress and fitted four unused brown 18650’s also from AliExpress and was expecting maybe 30 hours out of it but it is still good 45 (and counting) hours later, so maybe these batteries are just better/fresher or maybe they have improved the efficiency of the battery shield.

V9 Battery Shield on a 3d printed coaster I designed in the awesome OpenScad

The shields are a nice design in that you can fit 2 pin DuPont headers on both a 3.3v rail and a 5v rail to power several devices simultaneously and then you can use heavy duty copper core wire and solder that to the power-in pads of the Raspberry Pi rather than use the tiny cores of a usb cable. This will provide better power efficiency and much longer power cable lengths.

Verdict: Recommended!

(I have had three of the two cell battery shields in use for a couple of years which are still rock solid except one failing to charge through the micro-usb port which may have been due to a dodgy cable, but that one still charges OK through the usb-c port)

Also I would recommend with any battery that has been used outside, like now these batteries are operating in occasionally sub-zero temperatures, allow the batteries to warm to room temperature for an hour or so before charging.

Note: Do not put them on top of the fire or radiator.

The batteries themselves which have actually been sat doing nothing for over a year I think except a charge or two in a digital display 4 cell charger from guess where? (China of course), all seem quite balanced in the shield all discharged to either 3.04 or 3.05 volts before the shield shut down.. so all good!


OK, as is quite common with stuff from AliExpress these have an oddity, they stuck a new switch on so it operates in two modes… one mode the power status led’s stay on, and a double click on the white button will power it down… but!!! in the other mode, when you power it off it is still putting out 2v on both 5v and 3.3v rails so ????? Well as long as you know that!. And now you do!

Also I guess there are a lot of subtleties about usage modes for longevity of 18650’s I think these do (well they state they do) discharge to 2.5v while on power and then when it cuts out actually the cells recover to 3v… so only time will tell if you were to conduct simultaneous experiments of absolute discharge levels vs. numbers of recharge cycles which is best mode.

anyway, 46 Hours was not bad… and nice to know it can go that long, probably will swap them over at around the 30 hour range at which point they are not so discharged but will go through a recharge cycle…. which is most damaging? deep discharge or the actual recharge cycle? I guess that is the question?


Probably there is a difference in the quality of charge using a more expensive charger than these shields, Like this pack long term is getting 30 or so hours recharging using the shield. Which is in line with the longevity of the 2 cell packs I have had in use for a couple of years, so 600 or so cycles later on each of them still getting 12+ hours. The extra quality required if I was specifying the pack is missing. I guess dual rails are a power waste if you only want 5v or 3.3v for starters. Still as a general purpose thing, not bad. Could be aliexpress stuff from certain suppliers is better or worse. I Won’t mention names, they know who they are already.

My new design 3d-print external enclosure running and uploading graphs.

Graphs uploaded here will now be a better representation of actual external air quality being mounted on the shed rather than being in the shed, probably still some slight cold/warm coupling to the shed as it is in contact with the shed, but much less than being actually in the shed with the doors closed.  One problem exists in that I wired power direct to the pads on the pi and am using a pair of double 18650 AliExpress Chinese battery pack which are cool but not as efficient as they could be. Getting 12+ hours uptime from a pack but may be a delay in switching packs out and a step/spike in the graph if I let the sensor cool down between battery change as it warms up again. Really need to get a 100W solar panel on the shed (to probably get only 20W actual power at this time of year) enough to charge a “leisure battery” up during day.

The Irony of a CO2 shortage

Not been own-brand (neither expensive “mineral” nor own brand cheap fizzy tap water) fizzy water in local Morrisons for months! Was not in any old-brand supermarkets for a couple of months at least (Lidl still had some)  but Sainsburies got fizzy tap water now and Tesco have own brand fizzy mineral water. BUT!!! sure the Tesco mineral water is less fizzy than it was! That is to say it used to be impressively fizzy.

The thing is, this is a several years old problem, I researched it and it is to do with carbon footprint and energy costs and shutting down production of compressed CO2 in the UK. Our leaders are severely substandard it seems to me, except in the fields of bullshit and cover-up at which they excel!

Satellite videos working again

Not checked if satellite videos still working for a while, assumed it was.

I encountered a few problems having switched to an old raspberry pi-b to do the downloads and encoding which is also a SkyPiAQ test node, just to see how the hardware video encoding works using the omx mp4 encoder, I mean not bad, but quality is mediocre anyway. A vfat usb stick auto loading thing was the problem. Still, it is amazing how capable those old pi-b computers were. (and the pi zero).
So switched back to running on a Pi3, tried using h.265 but browser players not compatible enough, shame as it is like double space saving for same quality as standard h.264, so anyway sat vids for today back up with better quality videos.
Will get round to linking to all the missing videos.

Cameras using new awb_mode

New awb_mode for raspberry pi NoIR cameras is now available to fix the pink hue of running auto white balance on the raspberry NoIR cameras. Myself I would call it greenworld, but it is definitely an improvement on the standard auto mode for NoIR cams.
in /boot/config.txt add the following line to end of file

The Dimming, Full Length Climate Engineering Documentary ( Geoengineering Watch )

Lyndon Johnson: “He who controls the weather will control the world”

An Interesting documentary, I like the angle that he only cottoned on when he noticed his solar cell output drop! Of Course the marketing blurb on these panels is very probably far from the general truth

What it’s about, everyone could generate their own solar energy if the corporat-king laputans (laputans (laputa) are one of the sets of characters in Swifts, Gullivers Travels) were not blocking out the sunlight eh!