impactoz
Full Member
Posts: 142
Raspberry Pi: Yes
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Post by impactoz on Aug 17, 2019 19:52:44 GMT -8
Just wish it was simple... Many sensors are used in these projects, sometimes websites use lux (like stemweather) and others want to use solar radiation in w/m2 But apparently they are not the same thing and you simply cannot convert between the two !! github.com/weewx/weewx/wiki/Watts-and-luxDifferent sensors return different things; SI1145 The Sunlight / UV Original sensor - somewhat unreliable apparently - returned values; - Visible - IR - UV Index based on Visible and IR Measurements are in Lux, and this device is no longer recommended for new projects, suggested replacement is Si1153 TSL2591 The new recommended sensor - should do everything the SI1145 does - except there is NO UV Information - returned values; - Visible - IR - No UV Returns info as Lux VEML6075 - Only useful for UV. Not currently supported by SwitchDoc, but I have added it myself and its a great little UV Sensor - returned values; - UVA Index - UVB Index - UV Index So its very easy now to get Lux, and UV Index - but how to get Solar Radiation in W/m² - as you can not calculate it from Lux or anything else returned with these sensors ? The proper tool to do this is to use a Pyranometer - but these are more expensive than your current whole setup! There must be other sensors to do it - as many commercial - often cheap systems seem to produce the values for solar radiation in W/m². I have looked at nearby weather stations, and compared notes on values - and there is no linear correlation... I can get close on cloudy days when the values are low. BUt on bright days I would end up with orders of magnitude of difference. I cant find a sensor that would help in the low cost arena.... However some web pages talk about using a standard solar cell.... www.hackster.io/jeffrey2/measuring-solar-radiation-with-arduino-f741acWhats your thoughts - sticking a small solar cell onto our units and calculating the values per above link.... is that the only way to do it ? Accurate ? Looking for ideas or a really a solution !!!!
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Post by SDL on Aug 18, 2019 13:26:57 GMT -8
We have the VEML6075 in house, but we haven't tried them yet.
We are really interested in any possible solutions out there! I wonder if we could glean some of this data from the solar panel data? Probably not, as it is so tied in with the battery charge.
BP
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phate
New Member
Posts: 43
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Post by phate on Aug 24, 2019 6:07:57 GMT -8
VEML6075 - Only useful for UV. Not currently supported by SwitchDoc, but I have added it myself and its a great little UV Sensor - returned values; - UVA Index - UVB Index - UV Index How I wish I could just add sensors so easily. I really want to add a few more things. Like a colour sensor to get the colour of the sky. Is your code for this UV sensor on here somewhere? I wonder if your allowed to contribute code to the actual SDL GitHub. I'd also love to see a config setting that allows separate time lapse times for night and day.
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Post by SDL on Aug 24, 2019 6:43:53 GMT -8
Hey Phate,
Keep at it. You are already a lot more sophisticated than you were a year ago!
BP
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impactoz
Full Member
Posts: 142
Raspberry Pi: Yes
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Post by impactoz on Aug 26, 2019 0:11:23 GMT -8
I really want to add a few more things. Like a colour sensor to get the colour of the sky. I love sensors - I want to add more.... - Considered a radiation sensor just for the fun of it.... - Looked at how I could actually tell if it was snowing (not that I get any), and the best way seems to use a camera and look at reflections / changes - so going to pass on that one... - Already have a ultrasonic sensor to measure the water tank level at the farm on the same machine - which sends weekly email updates... Don't talk much about this experience as its not really weather related... - I have the VEML up and running and seems to work well.... So I will post my code / experience of that in a separate post... BUT YOU HAVE ME INTRIGUED... A color sensor to look at the sky ? Is that going to try and work out how cloudy it is.... I like the idea... hmmm... don't want too wide of an angle..... blue = no cloud cover... white would be cloudy... black if during the daytime - storms... You have got me excited !!! What else can you tell me !!!!
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impactoz
Full Member
Posts: 142
Raspberry Pi: Yes
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Post by impactoz on Aug 26, 2019 6:34:32 GMT -8
Your color sensor has started it - argghhhh…. Been looking around.....
Now assuming this was to detect clouds - which it may not, its just the first thing I thought of.... But a cloud detector would be interesting....
Seems the cheap way of doing it is to measure sky temperature and ambient temperature... The difference between the two is lower when its a clear day or night... kind of makes sense... but how to measure sky temperature....
The Mlx90615 sensor is an IR temperature device... and cheap at around the $10 mark....
But alas - I also found other things now I am thinking of.... A camera pointing upwards to take pics of the night sky! Even to count meteors.... where does this stop.... Can I now find a way to detect earth tremors - YES YOU CAN - Google Raspberry Shake....
So now left on my to do list; - Solar Radiation using a Solar Cell - Cloud Detection - Sky Camera (Astronomy pics) - Seismology
Will it never end!
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Post by SDL on Aug 26, 2019 8:54:16 GMT -8
You know, you can do cloud detection using an AI Machine learning algorithm based on photos from the camera. I've done similar things on the Raspberry Pi in two places: 1) In my Book: Python All-in-One for Dummies: amzn.to/2KTlc9N2) In our upcoming super secret kickstarter starting on September 9th. Another cool thing about the camera is you can turn off the IR filter (it does at night normally), and maybe you can get some pics from that! John
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impactoz
Full Member
Posts: 142
Raspberry Pi: Yes
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Post by impactoz on Aug 26, 2019 13:40:55 GMT -8
2) In our upcoming super secret kickstarter starting on September 9th. Followed that thread, and nobody had guessed what the new 'toy' will be... Did I accidently give it away... Any prizes for a good guess !!!! Cant wait until 9 Sep to find out what its called... SkyCloud ?
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wolf
New Member
Posts: 43
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Post by wolf on Aug 27, 2019 2:30:44 GMT -8
Maybe add more air quality sensors? The dust sensor fixed PM2.5. But there is also PM10, Ozone (O3), Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2) and Carbon Monoxide (CO) emissions.
I've no idea if there are any resonable cost sensors for these thou...
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impactoz
Full Member
Posts: 142
Raspberry Pi: Yes
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Post by impactoz on Aug 27, 2019 3:08:36 GMT -8
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Post by SDL on Aug 27, 2019 14:09:26 GMT -8
imapactoz,
Regarding super secret Kickstarter on September 9th, you are WAY off. It's not a weather station. But, it is a really fun Raspberry project! It's working in the lab, just in time.
BP
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impactoz
Full Member
Posts: 142
Raspberry Pi: Yes
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Post by impactoz on Aug 27, 2019 18:51:18 GMT -8
Was not suggesting it was a weather machine... but you suggested it was either looking at clouds or using AI... It might be interesting... Either those round circles are huge capacitor holders but they point 90 degrees away from the camera...
Lets hop that camera is pointing to the sky, and its going to be a UFO detector or a way to communicate with aliens at Area 51
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Post by topher2880 on Aug 28, 2019 17:11:37 GMT -8
Im in Broken Hill... myself and Phate are already discussing what cameras we would need for doing exactly that
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Post by topher2880 on Aug 28, 2019 17:13:58 GMT -8
Was not suggesting it was a weather machine... but you suggested it was either looking at clouds or using AI... It might be interesting... Either those round circles are huge capacitor holders but they point 90 degrees away from the camera... Lets hop that camera is pointing to the sky, and its going to be a UFO detector or a way to communicate with aliens at Area 51 I know what it is The capacitor housing comment cemented it... Its an AI taser
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impactoz
Full Member
Posts: 142
Raspberry Pi: Yes
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Post by impactoz on Aug 28, 2019 23:02:05 GMT -8
Im in Broken Hill... myself and Phate are already discussing what cameras we would need for doing exactly that Lovely part of the country... red dirt intermixed with gold... Been awhile since I have been there - have family I occasionally visit in Swan Hill... Live in Melbourne but have a farm 50km out of Bendigo - no light pollution, magnificent clear skies, but I know you would be better.... Saw a huge Meteor go over Melbourne last week - lit up the sky like anything - one of the brightest I have ever seen - it exploded over Melbourne and was bright thru all that light pollution. Can only imagine how bright that one would be in clear skies. I have built, got it ready - using sites.google.com/site/meteotuxpi/home as the trial. Just using a standard Pi v2 camera with fish eye lens... Im ready... but as I am in Melbourne it is cloudy, rainy, no clear skies - so just waiting for a good night to give it a trial... and I want to make sure its not going to rain - as I have not decided how I will waterproof it.... Fake CCTV Dome camera ? Go Pro underwater dome case ? Just not sure what plastic will withstand the harsh brightness of the sun for a few years... The plan is to experiment with it a little before taking it to the farm for some remote fun! Decided to build it completely on different hardware so it does not interfere with the weather station... See what happens....
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