Cumulus Support

Gina

I can decide the rain data units later but that's a good point about changing conversion factor depending in date/time for historical data - I had that problem with the FO station when I changed the rain gauge calibration. I think I'll build the conversion factor into the Arduino sketch and save the...

Gina

I now have date/time plus a some random data successfully logging to files on the SD card.

Gina

Code for logging date/time to SD card file :- // fetch the time now = RTC.now(); // log time logfile.print(now.year(), DEC); logfile.print("-"); logfile.print(now.month(), DEC); logfile.print("-"); logfile.print(now.day(), DEC); logfile.print("T"); logfile.print(now.hou...

Gina

Sorting out the RTC reading (and setting) and the data logging code. The data logging shield uses the Dallas DS1307 RTC chip which uses I2C and Analog pins 4 & 5 to talk to the Arduino. Info on this and more is on the appropriate web page :- http://www.ladyada.n...shield/rtc.html This provides l...

Gina

My "thought experiment" suggests that if (sun) light strikes a PV cell at 60 degrees off-axis then 50% of the available energy must "miss the target", so it should only read 50%. That's quite a loss in "energy efficiency" terms, but quite small in terms of photographic...

Gina

I did some experimenting with several different light detecting devices particularly with regard to their polar responce. The garden light PV cell was very good for angle of detection with an almost constant sensitivity over 160 degrees - which surprised me. However, I'm open to suggestions for anyt...

Gina

These are only rough at this stage. Yes, temperature will be in degrees Celsius with one decimal place and negative values, of course. Not sure whether to convert rainfall to mm or leave it as bucket tips. The latter is probably easiest. With my present rain gauge, 1 bucket tip = 0.04mm. Not sure ab...

Gina

Thanks Jim :) Yes, I would agree with that - I was going by a format I found for WS data. I'd store the wind direction as a number, either 0..15 or 0..360. It's easy to turn this into a string ('ENE') but not quite so easy to go the other way. You can also do arithmetic on numbers, e.g. summing the ...

Gina

Thanks for your reply Charlie

As you may have seen from another thread, I am going ahead with my 1-wire plus Arduino weather station. I may make this emulate the Fine Offset later on and in fact, am bearing this in mind from the start.

Gina

Thoughts so far on the data format (as CSV file - maybe one file per day) :- Record number (index) Date/time - yyyy/mm/dd hh:mm:ss Wind speed - dd.d Wind Direction - LLL (N ENE NE etc.) Light Level - ddd Outside Temperature - dd.d Outside Humidity - dd Rainfall - ddd Atmospheric Pressure - dddd Insi...

Gina

I'm working out some details of the data format and logging interval and such like. The new station will be able to hold far more data than the FO station. The FO logger can hold 4080 entries or lines. With 10m logging interval that represents about a fortnight's worth of data - with 1m interval it'...

Gina

We don't usually have any problem with too much sun in the UK

Gina

Here's a photo I took of my test setup for the DHT22 humidity and temperature sensor. You can also see a 1-wire digital temperature chip in a little copper P clip plus LCD display and breadboard. If you fancy a more retro looking display, I was much taken by this I read about today: http://www.seee...

Gina

Repaired/rebuilt the anemometer

Anemometer_01.jpg

Anemometer_02.jpg

Gina

I've had a look at the pole head instrument assembly (of my 1-wire weather station) and checked the storm damage. Two of the three buckets on the anemometer need replacing. I have a spare ping pong ball and doweling so no problem. The vane is cracked but I think it'll hang together though a couple o...

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Re: Arduino and 1-wire based home built weather station.

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Re: Arduino and 1-wire based home built weather station.

Re: Arduino and 1-wire based home built weather station.