How do you get accurate temperature measurements without air movement? Do you have lots of airflow around your 3D enclosure?
This all started as I was curious about the very small and single hole in the BME280 sensor. It only has one hole, so how does the air get in and vice-versa?
My enclosure is normally installed in a tree or the “crop of interest” but never in direct sunlight so the enclosure is at ambient air temperature and in this situation there is plenty of airflow around the outside of the enclosure. As a result the enclosure itself is at ambient temperature.
Being a LoraWan based device, I’m not sampling 1,000 times per second, more like every 20 minutes, so there is plenty of “settling time” for the sensor to adjust to a change in air temperature. My discussion about airflow was not to say the design stops all airflow but there is sufficient restriction to stop droplets of water from getting on the sensor. Its far more restricted than you might expect but I exploit the phenomena how moisture travels in air.
It’s a balance between letting in water droplets and completely stopping airflow. Maybe I should name this the Goldilocks enclosure? 
some old pics related, inside the BME280
lots of problems with 100%
empty dessert packaging to the rescue, for the airflow I’ve made some holes
this ‘solution’ helped a lot (looks a bit stupid 
)
but after some month’s I needed to use my special tools
Make your own Field strength meter (toy) and prove that signal strength varies inversely to distance 
Bit too quick there Borroz - the link shows how to make a complete device whereas your link just shows the module
1 Like
I’m sorry , wanted to say… I build something like that a few years ago.
But with a tuned filter
anyway these kits are also nice
unfortunately… I blew this one up 
1 Like
Maybe WORKBENCH, maybe not?
Anybody use the Raspberry Pi SD Card Copier? I just did and it just works and elegantly simple too. After all the faffing about in the past with partitions and block sizes, start and end points copying images to larger cards.
I have a Pi Model 3B+ velcro’d on the back of my “not smart” TV which has been very bloaty lately on an 8GB SD card. Plugged a card read/writer into the Pi, click-click and it is done. Just a few minutes to write the image but card is formatted and expanded into the free space. The SBC runs like it did from a fresh install. I am thinking it had very little swap space in memory or something, not my chosen subject!
As most of us seem to own and use these SBC’s I recommend it. Works well.
@BoRRoZ: The postman brought me a batch of 8x8 WS2812B tiles today. So many projects now…
1 Like
1 Like
Roller coaster temperatures in the garden shed…
(Green line)
Think your temp sensor is faulty, looks like it’s stuck, it doesn’t work above 20C. This is what a temp graph should peak at
1 Like
Yesterday one of my students got enthousiast. He really wanted to get connected to TTN so he built an antenne while I modified the node for him. Joint effort by student and teacher! We measured and tuned the antenna to 868 MHz in IoT class. #Fun!
4 Likes
1.02 SWR 
… you’re a master tuner
@slaven96 Here you go, the enclosure is cylindrical with the cable entering at the top so it hangs from the cable. There are two cylindrical walls with the slots on the inner and outer walls which are offset. A spray of water cannot get directly on the sensor. The bottom has holes to drain any water that enters through the slots in the outer wall. Actually just realised I don’t have many good photos of the enclosure. Will need to take some next time I’m on site which by the way is ~400Km away.
2 Likes
a friend’s PC that started smoking… it seems the (expensive) videocard 