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.
Looking at the sky through a Raspberry Pi