wind speed protocol for reed anemometer

[prioryjim]

Hello
I was planning to use a simple wind speed anemometer.
I would use a pic chip possibly PIC12F1840
Because
1) I have some
2) It has plenty of memory
3) It has a serial port
4) It has i2c

So, I have some simple code to de-bounce and count the reed pulses.

My question is what sort of protocol ?
I guess I could implement a number of messages where the PIC is queried for data.
But what should the messages contain ?

Plus count over 1 minute
Shortest pulse since last read

Any ideas
Thanks
Jim

[hippy]

Average windspeed since the last time the data was queried would seem the most sensible data to me. Maybe with some trending data so one can tell if windspeed is rising or falling, maybe maximum and minium detected.

You can provide multiple items of data; it would probably depend on what the program using the data does or requires.

[prioryjim]

Thanks
I wonder if the PIC should calculate this or just provide raw data.
Jim

[hippy]

I wonder if the PIC should calculate this or just provide raw data.

I don't think anyone can answer that any better than you can. What would best suit the program which uses the data ?

[prioryjim]

Could be of interest
https://www.ncbi.nlm.nih.gov/pmc/articl ... 01300title

[drgeoff]

What would you be providing the raw data to?

If anything other than a RPi, why are you asking here?

If a RPi why not connect the anemometer reed switch directly to the RPi?

[wolf.z]

Thinking of reusability of your design, you should consider windspeed in a NMEA or APRS sentence. With the latter being an amateur's quasi standrard format, the former being an industrial standard. See:
$WIMWV http://www.oceandatarat.org/?page_id=723 end of page
http://aprs.org/doc/APRS101.PDF page 27

[hippy]

Thinking of reusability of your design, you should consider windspeed in a NMEA or APRS sentence.

Good point. And those or some other standard might define what a "windspeed measurement" should be. Although I earlier suggested average would be best; current might be the data one was really after or the most useful. A meteorologist would probably know better than me.

[prioryjim]

Well I was thinking of the raw anemometer interface using a PIC and a comms interface i2c or serial to a PI
Jim

[wolf.z]

Well I was thinking of the raw anemometer interface using a PIC and a comms interface i2c or serial to a PI
Jim

OK, but what kind of raw are you thinking of? Is it raw reed puls, is it just two integer for gust (max) and average? In case of the former a simple question comes into my mind: What for would you need the PIC for? In case of the latter, adding some APRS or better NMEA syntax would allow to pipe data to applications without further processing directly in somehow standardized format.