🚀 go-pugleaf

Hola,

La estacion meteorologica es una de tipo aficionado, en particular la
Oregon Scientific WMR-928.

Esta estacion tiene un puerto serie unidireccional que vuelca a
intervalos regulares los datos que ha obtenido de los sensores
externos  (comunicacion inalambrica a 433Mhz).

Como ya os comente, la idea es coger esos datos, tratarlos y ponerlos
en internet a intervalos regulares, p.e. cada 15 minutos o media hora.

La captura de datos no la veo excesivamente problematica, simplemente
"cazando" el tty y volcando el trafico a un fichero.

Lo mas complicadito es transformar los datos  (mas abajo teneis la
descripcion del protocolo para que os hagais una idea) en algo "human
readable", despues lo pasaria a una DBase SQL.

Ultimo paso, extraer los datos de la SQL, p.e. velocidad media del
viento en los ultimos quince minutos, velocidad maxima en las ultimas
24 horas, etc. 

Y lo mas dificil, crear los graficos GIF o Jpeg que ilustren
graficamente los datos obtenidos para situarlos en la pagina web.

Chicos, gracias por la respues y aqui estamos...

Tomas

************************************************************************************


Protocol of the WMR918 weather Station(4)
-----------------------------------------

Data communication w/ the WMR918 weather station is unidirectional.
i.e. 
the data frames are put on the serial line by the station.

Each packet starts with two binary bytes of 0xFF. Each packet ends
with a
checksum. The type of packet is given by the third byte, and ranges
from
0x00 through 0x0f. Each type of packet has a predetermined length.

For example, a typical type 5 packet looks like:

  ff ff 05 00 09 02 47 09 dc 0c 50 79 0f

The checksum is the simple addition of each byte in the packet,
excluding
the checksum byte, keeping only the lowest 8 bits. 

In all further examples, the leading "ff ff" will be omitted. The .tab
output from wmr918d omits the leading "ff ff".

The known packet types are:

	00 - anemometer and wind related data
	01 - rain guage
	02 - extra sensors
	03 - outside temp, humidity and dewpoint
	04 - unknown
	05 - inside temp, humidity, dewpoint, and baro.
	06 - inside temp, humidity, dewpoint, baro for wmr968 and some
		wmr918's.
	07 - unknown
	08 - unknown
	09 - unknown
	0a - unknown
	0b - unknown
	0c - unknown
	0d - unknown
	0e - sequence number
	0f - hourly status report

The following description will attempt to use the same format as the
WX200 
listing by Mike Wingstrom. H is a hex digit from 0 to f. D is a
decimal digit
from 0 through 9. B is bit encoded, bit 3 is the high bit (0x8).



Type 00 - anemometer and wind related data

Byte	Nibble	Bit	Meaning
 1'	W	all	FF
 2'	W	all	FF
 0	W	all	00		Anemometer data packet
 1	Bx		Battery status. Higher value == lower battery
volt
 1	xB		Unknown
 2	DD		Gust direction, bc of 0<abc<359 degrees
 3	xD		Gust direction, a  of 0<abc<359 degrees
 3	Dx		Gust speed, c  of 0<ab.c<56 m/s
 4	DD		Gust speed, ab of 0<ab.c<56 m/s
 5	DD		Average speed, bc  of 0<ab.c<56 m/s
 6	xD		Average speed, a of 0<ab.c<56 m/s
 6	Bx	3	Sign of wind chill, 1 = negative
 7	DD		Wind chill

	Example: 00 00 90 01 00 00 00 07 96
	Example: gust at 190 degrees, 0 m/s, average 0, wind chill 7
Celsius


Type 01 - rain gauge

Byte	Nibble	Bit	Meaning
 1'	W	all	FF
 2'	W	all	FF
 0	W	all	01 : Rain guage packet
 1	Bx		Battery status. Higher value == lower battery
volt
 1	xB		Unknown
 2	DD		Rain rate, bc of 0<abc<999 mm/hr
 3	xD		Rain rate, a  of 0<abc<999 mm/hr
 3	Dx		Bucket tips since ??
 4	DD		Rain Total, cd of 0<abcd<9999 mm (?)
 5	DD		Rain Total, ab of 0<abcd<9999 mm (?)
 6	DD		Rain Yesterday, cd of 0<abdc<9999 mm (?)
 7	DD		Rain Yesterday, ab of 0<abcd<9999 mm (?)
 8	DD		Total reset minute
 9	DD		Total reset hour
10	DD		Total reset day
11	DD		Total reset month
12	DD		Total reset year 


	Example: 01 00 92 62 02 00 00 00 15 21 09 03 00 37
	Example: 292 mm/hr, 0 yesterday, 2mm total since 21:15
9-Mar-2000
	
Type 02 - extra sensors

Byte	Nibble	Bit	Meaning
 1'	W	all	FF
 2'     W	all	FF
 0	W	all	02 : Outside temp/humidity data
 1	Bx		Battery status. Higher value == lower battery
volt
 1   xB		Unknown
 1	xB		Sensor number bit encoded, 4=3 2=2 1=1
 2	DD		Outside temp, bc of -?<ab.c<? Celsius
 3	xD		Outside temp, a  of -?<ab.c<? Celsius
 3	Bx	3	Sign of outside temp, 1 = negative
 4	DD		Relative humidity, ab of ?<ab<? percent
 5	DD		Dew point, ab of 0<ab<? Celsius


	Example: 02 81 71 00 87 05 ff
	Example: 7.1 Celsius, 87% humidity, dew point 5 Celsius



Type 03 - outside temp, humidity and dew point

Byte	Nibble	Bit	Meaning
 1'	W	all	FF
 2'	W	all	FF
 0	W	all	03 : Outside temp/humidity data
 1	Bx		Battery status. Higher value == lower battery
volt
 1   xB		Unknown
 2	DD		Outside temp, bc of -?<ab.c<? Celsius
 3	xD		Outside temp, a  of -?<ab.c<? Celsius
 3	Bx	3	Sign of outside temp, 1 = negative
 4	DD		Relative humidity, ab of ?<ab<? percent
 5	DD		Dew point, ab of 0<ab<? Celsius


	Example: 03 01 71 00 87 05 ff
	Example: 7.1 Celsius, 87% humidity, dew point 5 Celsius

Type 04 - unknown

Type 05 - inside temperature, humidity, dew point, and baro

Byte	Nibble	Bit	Meaning
 1'	W	all	FF
 2'	W	all	FF
 0	W	all	05 : Inside sensor data
 1	Bx		Battery status. Higher value == lower battery
volt
 1	xB		Unknown
 2	DD		Inside temp, bc of -?<ab.c<? Celsius
 3	xD		Inside temp, a  of -?<ab.c<? Celsius
 3	Bx	3	Sign of temp, 1 = negative
 4	DD		Relative humidity, ab of ?<ab<? percent
 5	DD		Dew point, ab of 0<ab<? Celsius
 6	HH		Baro pressure, convert to decimal and add 795.
mb.
 7	Bx		Unknown
 7	xB		Encoded 'tendency' 0x0c=clear 0x06=partly
cloudy
			0x02=cloudy 0x03=rain
 8	DD		Sea level reference, cd of <abc.d>. 
 9	DD		Sea level reference, ab of <abc.d>. Add this
to raw
			bp from byte 6 to get sea level pressure.


	Example: 05 00 11 02 46 09 dc 0c 50 79 16
	Example: 21.1 Celsius, 46% humidity, dew point 9 Celsius
		 BP 1015 mb, sea level pressure 1015 mb.


Type 06 - inside temp, humidity, dewpoint baro for wmr968 and
	  some wmr918's


Byte	Nibble	Bit	Meaning
 1'	W	all	FF
 2'     W	all	FF
 0	W	all	06 : Inside sensor data
 1	Bx		Battery status. Higher value == lower battery
volt
 1   xB		Unknown
 2	DD		Inside temp, bc of -?<ab.c<? Celsius
 3	xD		Inside temp, a  of -?<ab.c<? Celsius
 3	Bx	3	Sign of temp, 1 = negative
 4	DD		Relative humidity, ab of ?<ab<? percent
 5	DD		Dew point, ab of 0<ab<? Celsius
 6	HH		Baro pressure, low byte (bc of abc)
 7	xB	0 	Baro pressure, a of abc. Convert abc from hex
			to decimal, add 600. to get mb. 
			a is low bit only.
			Upper three bits may be encoded BP tendency.
 7	Bx		Encoded 'tendency' 0x0c=clear 0x06=partly
cloudy
			0x02=cloudy 0x03=rain
 8	DD		Sea level reference, ef of <abcd.ef>. 
 9	DD		Sea level reference, cd of <abcd.ef>. 
10	DD              Sea level reference, ab of <abcd.ef> Add this
to raw
			bp from byte 6 and 7 to get sea level
pressure.


	Example: 06 00 29 02 41 09 8b 61 90 33 06 2e
	Example: 22.9 Celsius, 41% humidity, dew point 9 Celsius
		 BP 995 mb, sea level pressure 1028.9 mb.


Type E - sequence number

Byte	Nibble	Bit	Meaning
 1'	W	all	FF
 2'     W	all	FF
 0	W	all	0e : Sequence number packet
 1	Bx		Status, high bit, battery for main unit
 1	DD		After removing high bit, minute chime


	Example: 0e 81 8d
	Example: status = 1, time is hh:01


Type F - hourly status report


Byte	Nibble	Bit	Meaning
 1'	W	all	FF
 2'	W	all	FF
 0	W	al	0f : Hour Chime
 1	BB		Status. High bit == battery low
 2	DD		Hour 
 3	DD		Day 
 4	DD		Month 
 5	DD		Year 

	Example: 0f 80 07 09 03 00 a0
	Example: It's 7AM, 9-March-2000, do you know where your
weather
		station is?