[edr1924]

Hi edr1924,

I don't believe that the serial data format is as well documented as can be downloaded from Peet Bros., but if you are familiar with Arduino coding then you should be able to "reverse engineer" the data.

Thank you Alan for your thoughts on the subject and the Peet bros anemometer.  

Maybe one way to get the data I want on my large LED display is to simply(?) change the LCD output to LED?  I do not have access to the code yet but this must be possible?
Then I can use a wireless display unit, ripp off the lcd   and build it into the LED display enclosure.

I'm undicided which wind sensor to use, the Peet Bros unit is very sensitive and only 115 euro's. (Davis 6410  is 175 euro's)   But the Peet Bros unit has reed sensors (no hall) and a very clever way to read the wind dir and speed but WeatherDuino need a output of 0-5V so maybe I will make an Arduino conversion board or try the new Davis 6410.

Good quality Magnetic Reed sensors are extremely reliable, so IMHO not significantly inferior to Hall sensors, even for an anemometer. 

There you have an important point, maybe I have to search for high quality reed sensors. It's hard to place them because they also are very, very sensitive to vibrations and heat when soldering. Even cutting off the excess wire the wrong way or dropping a reed sensor 20 cm can damage the sensors permanently.   That's why Peet Bros does not solder but they use a crimping connection. (sorry, bad English I think)

The reed sensors in my Davis rain bucket system last only for 2 years?? I don't know why but maybe because I used old reed sensors I found in my shack.

However, I was very surprised to learn that anybody uses a potentiometer for wind direction (even Fine Offset used reeds in their sub-100 Euro stations).  But I guess that Davis must use a very high quality "professional quality" potentiometer, perhaps like used for mixing desks, etc.?

The Peet Bros method is much more elegant and I believe produces a simple "pulse position" output (albeit with a variable frequency).  That could be converted to an analogue (0 - 5v dc) voltage using just a "flip-flop" (bistable) followed by a (very) low-pass filter (many seconds time constant).  But a microcontroller method would be better, for example to bisect the angles between the rising and falling edges of the pulses, and to achieve the required very long time constant (i.e. sample and hold).

Unfortunately I don't have the knowledge to build a conventional conversion pcb but I found a sketch for an Arduino so thanks to your comments I will try to build a conversion system with the Arduino so I can use the Peet bros anemometer with the WeatherDuino.  Would be great!

I bought my 6410 much more cheaply (on eBay), but otherwise I would be very tempted by the Peet Bros. anemometer.  I note that the (only) UK distributor is selling the complete "low end" station (Ultimeter-100) at the equivalent of about 150 Euros.  That includes the same "Professional" anemometer, a console (which also delivers the  RS232 serial data for a computer), 12v power supply and external temperature sensor, etc.  However, "complete station" is rather an over-statement because the Rain and Internal Temperature sensors are high-priced "options" and it doesn't support Humidity (Out or In) or Barometric Pressure sensors at all.  

This shop CLICK also ships worldwide so if someone is interested in a Peet bros Anemometer...
Sadly after sale of the Peet bros company, nothing changed, no new systems etc...


Cheers,  Alan.

Thank you!
Erik