I do not have this weather station so I have copied and pasted your python3
file to a format that WeeWX should understand. There will be bugs since I
have no way to test it :)
*I invite others* lurking here to review and update anything obvious as
well - for sanity's sake. I've commented the code with some questions *which
input from others here* could be valuable in finishing the driver.
To install:
1. Copy the attached byows.py to your bin/user folder
2. Copy the dependency files from your python folder to bin/user
otherwise the script won't start.
1. Such as wind_direction_byo_5.py, and any bme280 files.
3. Copy this section to the bottom of weewx.conf. (there are no driver
options yet, that might come in future) - I named it BYOWS for "Bring Your
Own Weather Station"
[BYOWS]
# This section is for the Raspberry Pi Bring Your Own Weather Station
driver.
# The driver to use
driver = user.byows
Restart weewx
Check syslog with sudo tail -f /var/log/syslog -n 100 and see what errors
come up and paste them here.
On Saturday, December 8, 2018 at 3:02:38 PM UTC-5, Patrick Tranchant wrote:
>
> Yes it is good
>
> On Saturday, December 8, 2018 at 3:40:43 PM UTC+1, Patrick Tranchant wrote:
>>
>> hello I am a newbie from France ( sorry for my english )
>>
>> I want to use weewx on a raspberry with a weather station built by myself
>> (view on Magpi)
>> I don't see my station on your website to configure :
>>
>> Weather Station Hardware Comparison: I don't found my weather station.
>> Do you have a solution or how to configure Weewx
>>
>> thank you for your help
>>
>> Patrick
>>
>
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#!/usr/bin/python
# Copyright 2018 Pat O'Brien https://obrienlabs.net
#
# This driver takes the sensors used in the Raspberry Pi
# build your own weather station project and converts it
# into a format that can be used with weewx.
#
# The Raspberry Pi project can be found here:
# https://projects.raspberrypi.org/en/projects/build-your-own-weather-station
#
from gpiozero import Button
import time
import math
import bme280_sensor_2
import wind_direction_byo_5
import statistics
import ds18b20_therm
import datetime
import syslog
import weedb
import weewx.drivers
import weeutil.weeutil
import weewx.wxformulas
temp_probe = ds18b20_therm.DS18B20()
wind_speed_sensor = Button(5)
wind_speed_sensor.when_pressed = BYOWS.spin # is this a valid call for the below class function?
rain_sensor = Button(6)
rain_sensor.when_pressed = BYOWS.bucket_tipped # is this a valid call for the below class function?
def logmsg(dst, msg):
syslog.syslog(dst, 'BYOWS: %s' % msg)
def loginf(msg):
logmsg(syslog.LOG_INFO, msg)
def logerror(msg):
logmsg(syslog.LOG_ERROR, msg)
def logdebug(msg):
logmsg(syslog.LOG_DEBUG, msg)
def loader(config_dict, engine):
station = BYOWS(**config_dict['BYOWS'])
return station
class BYOWS(weewx.drivers.AbstractDevice):
""" Driver for the Raspberry Pi Bring Your Own Weather Station. """
def __init__(self, **stn_dict) :
""" Initialize object. """
self.station_hardware = stn_dict.get('hardware')
# TODO CONVERT TO WEEWX OPTIONS?
self.interval = 60 # Measurements recorded every 1 minute
self.wind_count = 0 # Counts how many half-rotations
self.radius_cm = 9.0 # Radius of your anemometer
self.wind_interval = 5 # How often (secs) to sample speed
self.wind_gust = 0
self.cm_in_a_km = 100000.0
self.secs_in_an_hour = 3600
self.adjustment = 1.18
self.bucket_size = 0.2794 # mm
self.rain_count = 0
self.store_speeds = []
self.store_directions = []
def hardware_name(self):
return self.station_hardware
# Every half-rotations, add 1 to count
def spin(self):
self.wind_count = self.wind_count + 1
#print("spin" + str(self.wind_count))
def calculate_speed(self, time_sec):
circumference_cm = (2 * math.pi) * self.radius_cm
rotations = self.wind_count / 2.0
# Calculate distance travelled by a cup in km
dist_km = (circumference_cm * rotations) / self.cm_in_a_km
# Speed = distance / time
km_per_sec = dist_km / time_sec
km_per_hour = km_per_sec * self.secs_in_an_hour
# Calculate Speed
final_speed = km_per_hour * self.adjustment
return final_speed
def bucket_tipped(self):
self.rain_count = self.rain_count + 1
#print (self.rain_count * self.bucket_size)
def reset_rainfall(self):
self.rain_count = 0
def reset_wind(self):
global self.wind_count
self.wind_count = 0
def reset_gust(self):
self.wind_gust = 0
#===============================================================================
# LOOP record decoding functions
#===============================================================================
def genLoopPackets(self):
""" Generator function that continuously returns loop packets """
for _packet in self.genPackets():
yield _packet
def genPackets(self):
""" Generate measurement packets. """
global temp_probe
while True:
start_time = time.time()
while time.time() - start_time <= self.interval:
wind_start_time = time.time()
self.reset_wind()
while time.time() - wind_start_time <= self.wind_interval:
self.store_directions.append( wind_direction_byo_5.get_value() )
final_speed = calculate_speed( self.wind_interval ) # Add this speed to the list
self.store_speeds.append( final_speed )
wind_average = wind_direction_byo_5.get_average( self.store_directions )
self.wind_gust = max( self.store_speeds )
wind_speed = statistics.mean( self.store_speeds )
rainfall = self.rain_count * self.bucket_size # mm. if units are US, do we need to convert to inch?
self.reset_rainfall()
self.store_speeds = []
self.store_directions = []
ground_temp = temp_probe.read_temp()
humidity, pressure, ambient_temp = bme280_sensor_2.read_all()
# Build the weewx loop packet
packet = { 'dateTime': int( time.time() ), 'usUnits': weewx.US }
packet['outTemp'] = float( ambient_temp )
packet['outHumidity'] = float( humidity )
packet['soilTemp1'] = float( ground_temp )
packet['pressure'] = float( pressure )
packet['rain'] = rainfall
packet['windDir'] = float( wind_average )
packet['windSpeed'] = float( wind_speed )
packet['windGust'] = float( self.wind_gust )
# Send to the loop
yield packet
# Delay reading sensors for the interval time?
#time.sleep( self.interval )
