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sensor_vantage_pro2.py
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###########################################################################
# Sint Wind PI
# Copyright 2012 by Tonino Tarsi <tony.tarsi@gmail.com>
# Comunication based on WFrog
# Please refer to the LICENSE file for conditions
# Visit http://www.vololiberomontecucco.it
#
##########################################################################
"""This module defines the base sensors wh1080 ."""
import threading
import time
import config
import random
import datetime
import sqlite3
from TTLib import *
import sys
import subprocess
import globalvars
import meteodata
import sensor_thread
import sensor
import logging
import WeatherStation
import units
import array
import struct
logFile = datetime.datetime.now().strftime("log/davis_%d%m%Y.log")
logging.basicConfig(filename=logFile,filemode='wa',level=logging.DEBUG)
# logging.basicConfig(format='%(asctime)s %(message)s', datefmt='%d/%m/%Y %I:%M:%S %p')
def get_wind_dir_text():
return [ 'N','NNE','NE','ENE','E','ESE','SE','SSE','S','SSW','SW','WSW','W','WNW','NW','NNW' ]
class Sensor_VantagePro2(sensor.Sensor):
#port='/dev/ttyUSB0'
baud=19200
loops=25
rain_bucket = 'eu'
pressure_cal = 0
logger = logging.getLogger('station.vantagepro')
name = 'Davis VantagePro'
# device reply commands
WAKE_ACK = '\n\r'
ACK = '\x06'
ESC = '\x1b'
OK = '\n\rOK\n\r'
def __init__(self,cfg ):
sensor.Sensor.__init__(self,cfg )
self.port = cfg.sensor_serial_port
def Detect(self):
return True,"","",""
def GetData(self):
import serial
_LoopStruct = LoopStruct(self.rain_bucket)
assert self.rain_bucket in ['eu', 'us']
assert self.baud in [19200, 9600, 4800, 2400, 1200]
while True:
seconds = datetime.datetime.now().second
if ( seconds < 30 ):
time.sleep(30-seconds)
else:
time.sleep(90-seconds)
self._port = serial.Serial(self.port, self.baud, timeout=10)
try:
bad_CRC = 0
self._wakeup()
self._cmd( 'LOOP', self.loops)
for x in xrange(self.loops):
raw = self._port.read( _LoopStruct.size ) # read data
self.logger.debug('read: ' + raw.encode('hex'))
crc_ok = VProCRC.verify( raw )
if crc_ok:
bad_CRC = 0
self.logger.debug("CRC OK")
fields = _LoopStruct.unpack(raw)
# print fields
globalvars.meteo_data.status = 0
globalvars.meteo_data.last_measure_time = datetime.datetime.now()
globalvars.meteo_data.idx = datetime.datetime.now()
globalvars.meteo_data.abs_pressure = fields['Pressure'] + self.pressure_cal
globalvars.meteo_data.temp_in = fields['TempIn']
globalvars.meteo_data.hum_in = fields['HumIn']
globalvars.meteo_data.temp_out = fields['TempOut']
globalvars.meteo_data.hum_out = fields['HumOut']
globalvars.meteo_data.rain = fields['RainRate']
globalvars.meteo_data.rain_rate_24h = fields['RainDay']
globalvars.meteo_data.wind_dir = fields['WindDir']
globalvars.meteo_data.RainStorm = fields['RainStorm']
globalvars.meteo_data.RainMonth = fields['RainMonth']
globalvars.meteo_data.RainYear = fields['RainYear']
globalvars.meteo_data.StormStartDate = fields['StormStartDate']
globalvars.meteo_data.BatteryVolts = fields['BatteryVolts']
globalvars.meteo_data.wind_gust = float(fields['WindSpeed']) *self.cfg.windspeed_gain + self.cfg.windspeed_offset
globalvars.meteo_data.wind_ave = float(fields['WindSpeed10Min']) *self.cfg.windspeed_gain + self.cfg.windspeed_offset
wind_dir = fields['WindDir']
val=int((wind_dir/22.5)+0.5)
globalvars.meteo_data.wind_dir_code = get_wind_dir_text()[val]
#log_txt += "Wind:%.3fm/s %d " % (fields['WindSpeed'], fields['WindDir'])
# UV sensor
if fields['UV'] is not None:
globalvars.meteo_data.uv = fields['UV']
# Solar radiation sensor
if fields['SolarRad'] is not None:
globalvars.meteo_data.illuminance = fields['SolarRad']
sensor.Sensor.GetData(self)
else:
self.logger.info("CRC Bad")
bad_CRC += 1
# Two consecutive CRC errors => exception & abort LOOP command
if bad_CRC > 1:
raise Exception("CRC error")
time.sleep(2)
except Exception, e:
self.logger.error(e)
time.sleep(self.loops * 2)
finally:
self._port.close()
self._port = None
def _wakeup(self):
'''
issue wakeup command to device to take out of standby mode.
'''
self.logger.debug("send: WAKEUP")
for i in xrange(3):
self._port.write('\n') # wakeup device
ack = self._port.read(len(self.WAKE_ACK)) # read wakeup string
self.logger.debug('read: ' + ack.encode('hex'))
if ack == self.WAKE_ACK:
return
raise Exception('Cannot access weather station (WAKEUP)')
def _cmd(self,cmd,*args,**kw):
'''
write a single command, with variable number of arguments. after the
command, the device must return ACK
'''
ok = kw.setdefault('ok',False)
if args:
cmd = "%s %s" % (cmd, ' '.join(str(a) for a in args))
self.logger.debug('send: ' + cmd)
for i in xrange(3):
self._port.write( cmd + '\n')
if ok:
ack = self._port.read(len(self.OK)) # read OK
self.logger.debug('read: ' + ack.encode('hex'))
if ack == self.OK:
return
else:
ack = self._port.read(len(self.ACK)) # read ACK
self.logger.debug('read: ' + ack.encode('hex'))
if ack == self.ACK:
return
raise Exception('Cannot access weather station (%s)' % cmd)
# --------------------------------------------------------------------------- #
class NoDeviceException(Exception): pass
# --------------------------------------------------------------------------- #
class VProCRC(object):
'''
Implements CRC algorithm, necessary for encoding and verifying data from
the Davis Vantage Pro unit.
'''
CRC_TABLE = (
0x0, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0xa50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0xc60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0xe70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0xa1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x2b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x8e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0xaf1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0xcc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0xed1, 0x1ef0,
)
@staticmethod
def get(data):
'''
return CRC calc value from raw serial data
'''
crc = 0
for byte in array.array('B',data):
crc = (VProCRC.CRC_TABLE[ (crc>>8) ^ byte ] ^ ((crc&0xFF) << 8))
return crc
@staticmethod
def verify(data):
'''
perform CRC check on raw serial data, return true if valid.
a valid CRC == 0.
'''
if len(data) == 0:
return False
crc = VProCRC.get(data)
return not crc
# --------------------------------------------------------------------------- #
class myStruct( struct.Struct ):
'''
Implements a reusable class for working with a binary data structure. It
provides a named fields interface, similiar to C structures.
Usage: 1) subclass and extend _post_unpack method
2) instantiate directly, if no 'post unpack' processing needed
Arguments:
See `struct.Struct` class defintion.
'''
def __init__(self, fmt, order='@'):
self.fields, fmt_t = zip(*fmt)
fmt_s = order + ''.join(fmt_t)
super(myStruct,self).__init__( fmt_s )
def unpack(self, buf):
'''
see unpack_from()
'''
return self.unpack_from( buf, offset=0 )
def unpack_from(self, buf, offset=0 ):
'''
unpacks data from 'buf' and returns a dication of named fields. the
fields can be post-processed by extending the _post_unpack() method.
'''
data = super(myStruct,self).unpack_from( buf, offset)
items = dict(zip(self.fields,data))
return self._post_unpack(items)
def _post_unpack(self,items):
'''
perform data modification of any values, after unpacking from a buffer.
'''
return items
class LoopStruct( myStruct ):
'''
For unpacking data structure returned by the 'LOOP' command. this structure
contains all of the real-time data that can be read from the Davis Vantage
Pro.
'''
FMT = (
('LOO', '3s'), ('BarTrend', 'B'), ('PacketType', 'B'),
('NextRec', 'H'), ('Pressure', 'H'), ('TempIn', 'H'),
('HumIn', 'B'), ('TempOut', 'H'), ('WindSpeed', 'B'),
('WindSpeed10Min','B'),('WindDir', 'H'), ('ExtraTemp1', 'B'),
('ExtraTemp2', 'B'), ('ExtraTemp3', 'B'), ('ExtraTemp4', 'B'),
('ExtraTemp5', 'B'), ('ExtraTemp6', 'B'), ('ExtraTemp7', 'B'),
('SoilTemps', '4s'), ('LeafTemps', '4s'), ('HumOut', 'B'),
('ExtraHum1', 'B'), ('ExtraHum2', 'B'), ('ExtraHum3', 'B'),
('ExtraHum4', 'B'), ('ExtraHum5', 'B'), ('ExtraHum6', 'B'),
('ExtraHum7', 'B'), ('RainRate', 'H'), ('UV', 'B'),
('SolarRad', 'H'), ('RainStorm', 'H'), ('StormStartDate','H'),
('RainDay', 'H'), ('RainMonth', 'H'), ('RainYear', 'H'),
('ETDay', 'H'), ('ETMonth', 'H'), ('ETYear', 'H'),
('SoilMoist', '4s'), ('LeafWetness','4s'), ('AlarmIn', 'B'),
('AlarmRain', 'B'), ('AlarmOut' , '2s'), ('AlarmExTempHum','8s'),
('AlarmSoilLeaf','4s'),('BatteryStatus','B'), ('BatteryVolts','H'),
('ForecastIcon','B'), ('ForecastRuleNo','B'),('SunRise', 'H'),
('SunSet', 'H'), ('EOL', '2s'), ('CRC', 'H'),
)
def __init__(self, rain_bucket):
super(LoopStruct,self).__init__(self.FMT,'=')
self.rain_bucket = rain_bucket
def _post_unpack(self,items):
# Pressure
items['Pressure'] = units.InHgToHPa(items['Pressure'] / 1000.0)
# Temperature
items['TempIn'] = units.FToC(items['TempIn'] / 10.0)
items['TempOut'] = units.FToC(items['TempOut'] / 10.0)
items['ExtraTemp1'] = units.FToC(items['ExtraTemp1'] / 10.0) if items['ExtraTemp1'] != 255 else None
items['ExtraTemp2'] = units.FToC(items['ExtraTemp2'] / 10.0) if items['ExtraTemp2'] != 255 else None
items['ExtraTemp3'] = units.FToC(items['ExtraTemp3'] / 10.0) if items['ExtraTemp3'] != 255 else None
items['ExtraTemp4'] = units.FToC(items['ExtraTemp4'] / 10.0) if items['ExtraTemp4'] != 255 else None
items['ExtraTemp5'] = units.FToC(items['ExtraTemp5'] / 10.0) if items['ExtraTemp5'] != 255 else None
items['ExtraTemp6'] = units.FToC(items['ExtraTemp6'] / 10.0) if items['ExtraTemp6'] != 255 else None
items['ExtraTemp7'] = units.FToC(items['ExtraTemp7'] / 10.0) if items['ExtraTemp7'] != 255 else None
# Humidity
items['ExtraHum1'] = items['ExtraHum1'] if items['ExtraHum1'] != 255 else None
items['ExtraHum2'] = items['ExtraHum2'] if items['ExtraHum2'] != 255 else None
items['ExtraHum3'] = items['ExtraHum3'] if items['ExtraHum3'] != 255 else None
items['ExtraHum4'] = items['ExtraHum4'] if items['ExtraHum4'] != 255 else None
items['ExtraHum5'] = items['ExtraHum5'] if items['ExtraHum5'] != 255 else None
items['ExtraHum6'] = items['ExtraHum6'] if items['ExtraHum6'] != 255 else None
items['ExtraHum7'] = items['ExtraHum7'] if items['ExtraHum7'] != 255 else None
# Wind
#items['WindSpeed'] = units.MphToMps(items['WindSpeed'])
#items['WindSpeed10Min'] = units.MphToMps(items['WindSpeed10Min'])
# Rain / European version => each bucket tip ~ 0.2mm
if self.rain_bucket == 'eu':
items['RainRate'] = items['RainRate'] / 5.0
items['RainStorm'] = items['RainStorm'] / 5.0
items['RainDay'] = items['RainDay'] / 5.0
items['RainMonth'] = items['RainMonth'] / 5.0
items['RainYear'] = items['RainYear'] / 5.0
# Rain / US version => each bucket tip ~ 0.01 inches. Conversion to mm needed.
elif self.rain_bucket == 'us':
tems['WindSpeed'] = units.MphToMps(items['WindSpeed'])
items['WindSpeed10Min'] = units.MphToMps(items['WindSpeed10Min'])
items['RainRate'] = units.InToMm(items['RainRate'] / 100.0)
items['RainStorm'] = units.InToMm(items['RainStorm'] / 100.0)
items['RainDay'] = units.InToMm(items['RainDay'] / 100.0)
items['RainMonth'] = units.InToMm(items['RainMonth'] / 100.0)
items['RainYear'] = units.InToMm(items['RainYear'] / 100.0)
items['StormStartDate'] = self._unpack_storm_date(items['StormStartDate'])
# UV
items['UV'] = (items['UV'] / 10.0) if items['UV'] != 255 else None
# SolarRad
items['SolarRad'] = items['SolarRad'] if items['SolarRad'] != 32767 else None
# evapotranspiration totals
items['ETDay'] = items['ETDay'] / 1000.0
items['ETMonth'] = items['ETMonth'] / 100.0
items['ETYear'] = items['ETYear'] / 100.0
#soil moisture + leaf wetness
items['SoilMoist'] = struct.unpack('4B',items['SoilMoist'])
items['LeafWetness'] = struct.unpack('4B',items['LeafWetness'])
# battery statistics
items['BatteryVolts'] = items['BatteryVolts'] * 300 / 512.0 / 100.0
# sunrise / sunset
items['SunRise'] = self._unpack_time( items['SunRise'] )
items['SunSet'] = self._unpack_time( items['SunSet'] )
return items
@staticmethod
def _unpack_time( val ):
'''
given a packed time field, unpack and return "HH:MM" string.
'''
# format: HHMM, and space padded on the left.ex: "601" is 6:01 AM
return "%02d:%02d" % divmod(val,100) # covert to "06:01"
@staticmethod
def _unpack_storm_date( date ):
'''
given a packed storm date field, unpack and return 'YYYY-MM-DD' string.
'''
year = (date & 0x7f) + 2000 # 7 bits
day = (date >> 7) & 0x01f # 5 bits
month = (date >> 12) & 0x0f # 4 bits
return "%s-%s-%s" % (year, month, day)
if __name__ == '__main__':
"""Main only for testing"""
configfile = 'swpi.cfg'
cfg = config.config(configfile)
globalvars.meteo_data = meteodata.MeteoData(cfg)
ws = Sensor_VantagePro2(cfg)
ws.GetData()