BPW34 - high sensitive pin photodiode
I’m moving my electronic (hobby) workshop to another room and I was looking online for material to make my own (bigger) workbench.
then I found this ‘used’ office outlet, just 10 minutes from my home and buying a used desk is almost cheaper then building it.
Anybody who needs (NL) an affordable hobby worktable… look
- so I bought 2 … now I get an 3.20 x 0.80 workbench …
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Have you completed the SHT31D Rocket Scream low power extra long life V 2.0 LoRaWAN node?
Can you share your experience with the SHT31D Sensor?
this morning the test node died… for real 
so yes I finished the rocketscream lowpower node test
result : 290 days on a single AA battery transmitting temp / framecounter / humidity every 5 min.
but that test was done with a BME280 sensor
the node died when the voltage dropped to 1.17 V last night
the V2 version (the one that’s available now, will even last a bit longer)
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I meant The WORKBENCH part 1 - #949 by BoRRoZ
the new node with better SHT31D Sensor.
i read the BME280 is not so good
so I thought you already have experience with the SHT31D Sensor
ah ok that one … sorry no… not finished yet
the BME280 worked fine indoors, but I think it’s getting very fast to 100% humidity outdoors
very good service I experienced on eBay.
I was not completely happy with the product I bought and the shopowner understand my problem and replaced them very fast, thank you mr. Hunk Lee !
So If you need (big) LIPO’s I can recommend A-OK battery !
the problem when you just can’t throw away working equipment … 
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Get yourself a S.O. (significant other), she/he will take care of it 
uhhhhhhhhh … 
selected components for power unit mobile outdoor 4g gateway
can provide 5v and 12v for min. 48 hours continue
energy storage … diy ‘powerwalls’ … the new frontier
here one build in an old vending machine
most builds use recycled laptop and other equipment lion battery’s… up to 900 and more
of course it would be interesting to get a lot of data from such a wall… state of charge from every cell, temps, humidity ect ect…
batrium
This Batrium thing looks nice…
I am really questioning all these builds where there is no single cell monitoring.
In radio-controlled model car racing, cell balancing has always been critical. If you don’t balance your cells, weak ones are becoming weaker and weaker across charges and you will overcharge healthy ones.
I am probably missing something, but I don’t see how these big “arrays” of batteries in parallel stay balanced over time.
(Also I have seen enough bad things happening with LiPo that I am very reluctant to have DIY LiPo operated devices at home… )
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yes there is a certain risk .
I’m following a few groups and most of them know what they are building.
Tesla is selling wallmounted ‘blocks’ of 120 kg… for your home.
if you search social media you’ll find that the subject of energy storage is very alive at the moment, I’m interested to see if LoRa(WAN) can be usefull to monitor such an installation and how.
'I am probably missing something, but I don’t see how these big “arrays” of batteries in parallel stay balanced over time.
yes they are all balanced to the max… starting with selecting equal capacity ones and mounting them in the most profitable order in an array (there’s software for that)
and then of course active or passive BMS
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wiring an UTP cable for the new workbench… with the help of YouTube