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7170

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About 7170

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    Surbiton (Berrylands), London
  1. Currently very clear here but windy (10 minute average just over 20km/h). I've brought the Pi3 that has astroberry on it inside to do an update (last update was in January this year) and there are more than 600 packages that are currently downloading and updating. Not sure it is going to finish anytime soon!
  2. CO still suggesting that Sunday evening will be OK, but clear skies on Monday evening have been push back into the early hours of Tuesday morning when i'll definitely be asleep. But Tuesday and Wednesday evenings have now opened up as opportunities - fingers crossed! The sun hours trend this year has been quite interesting. March was +30% up on the long term average; April was +49% up; and May was +58% up. But June was 12% down on the average - almost exactly the same amount down as last year. It will be interesting to see what July and August look like compare to long term trends. Over the last decade here April has been consistently higher than average, May more often than not has been higher than average, and June less than average; July around average and August below average. The bell shape average curve by month you saw if you average all the 80s/90s has not played out for the average of the years after 2010. August now gets on average less sun than April, where as it used to be a top month and getting almost the same as July (which in the 80's/90s was also higher than today averages). In summary someone must have bough a very very expensive telescope in the UK in the year 2010 to cause this change! I was going to try and get the electronic focuser working again this weekend, so Sunday maybe a little more manual than usual if things don't go to plan or I need parts. Not even though about possible targets though, if I do I know the forecast will change!
  3. CO suggesting Sunday and Monday could be ok but definitely nothing this evening!
  4. @Gina If you put it in a sub-optimal location, you can assume it will be very reliable. If you put it in the ideal location (high up, hard to get down etc), then you can be sure it will not be reliable and require frequent inspection. There must be a name for this phenomenon when it comes to weather instruments.
  5. Agreed, ones I have seen usually use plastic, brass or SS parts on the spindles. Also avoid any oil/grease too as that can end up just being a receptacle for dust/gunk over time, making it harder to spin.
  6. 16kR is a standard E28 resistor. Yes some are rather close but lots of people connect up that wind vane to arduinos with success. There must be a method in the madness somewhere . Do you have a laser printer, maybe a diode measuring an led shining through a circular piece of laser OHP film with varying density around it? Similar idea to a variable density optical soundtrack on old 16/35mm film prints.
  7. 64.9kR isn't in stock everywhere but you can get on eBay/mouser (I admit a bit of a faff). The rest should be easy to get hold of online (Bitsbox for example). Edit- in fact from Bitsbox you could use 1% 62kR+1.8kR+1.1kR and get all the others as single resistors from there.
  8. You can see the 8 standard resistor values used in this popular model that lots of cheap weather stations use: Wind Vane Datasheet "Only" needs 8 resistors, 8 reed switchers and one analogue input.
  9. With a 3D printer making either solution would not be too much of an issue. I would still be tempted to try optical with reed switches as the fallback plan. One of my projects is to build an ultrasonic version, I just need some more free time!
  10. I think you can be very proud of your work - looks like good plots with the expected shapes and to my eye doesn't look to have a temperature variance that needs to be adjusted for (assuming it is just raw data being plotted). I would also argue the above plots are not that noisy, so you should be able to see C/M/X class flares and maybe even B class too. I would play with a moving average (in excel) once you have some known flares to see if that is worth applying to data once it is captured and if the flares are still all visible or not. Another challenge can be managing all the archive of data once you are capturing ok, so you can quickly plot specific days. I plot with a 10s capture interval and find excel struggles and even PowerBI is a bit slow. In the future i'm thinking of putting everything into a MySql DB and using python for processing and then graphing - I just need some free time!
  11. I would guess this would be in the low pf range, if so this is a tough call to consistently read the exact value without external hardware and that is before you factor stray capacitance and the fact the capacitance of the wires/ESP input may be too close to your actual capacitor. I found this while making capacitive leaf wetness sensors, had to use a 555 and then read the frequency change. The other problem will be keeping it dry and consistent humidity as the value will change depending on humidity. Personally I would use a magnet on the shaft and number of reed relays and a resistor network if I were building one. A lot of ones you can buy actually just use a linear potentiometer, hence why they don't last forever. The idea of a rotating card and optical sensors will work. The hardest part is calculating the dominant direction (via vectors) as you obviously can't use just an average. Regarding wind speed I would only have one magnet so you get one trigger per full rotation. You will want to have as long a debounce time as you can based on the max windspeed you would want to measure. Three magnets could result in too short a debounce time. Hope the above makes sense.
  12. For my ESP boards (32 and 8266) alI ever needed to do was add them in board manager and nothing further. The only funny with the ESP32 is I have to hold reset until the upload starts then I can let go. Never had to use any separate flashing app.
  13. What sensors are you planning to use @Gina? I have to start thinking about what to do with my station when things start to wear out. Currently I have a combination of Oregon and Davis sensors, plus a rain wise tipping bucket, one wire temperature sensors and home made made soil, solar, leaf wetness and lightning sensors. In terms of receiver two arduinos (one for each protocol) intercepting the wireless transmissions connected to a pi2 running a python script to collect/process the data (calculate things like 10 min dominate wind direction etc) and saves to a mysql DB every minute. For all my custom sensors they are wireless using off the shelf 433mhz modules and barebones ATmega328s to save power, and I emulate the oregon v3 wireless protocol which the receiver then picks up. No off the shelf weather station is perfect and if you look at some of the more expensive ones they are still using off the shelf sensors that you can buy fairly cheaply.
  14. Good night Dave/Gina, bedtime here too. The weather is not great - the sky is covered. Hopefully someone, somewhere, is out tonight looking up at the sky and actually seeing past our atmosphere!
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