Programme
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meteo_otio.py
Executable file
161
meteo_otio.py
Executable file
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#!/usr/bin/env python3
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# -*- coding: UTF-8 -*-
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'''
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Ce programme récupère les données d'une station météo OTIO WH5100 au moyen
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d'un dongle DVB-T de type RTL-2838
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'''
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__docformat__ = 'restructuredtext en'
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from datetime import datetime
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import subprocess
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import urllib.request
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import json
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import logging
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logging.basicConfig(
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level=logging.DEBUG,
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format='[METEO] - %(asctime)s - %(message)s',
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datefmt='[%d/%m/%Y %H:%M:%S]')
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API_URL = "http://127.0.0.1:8088/api/meteo"
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RTL_SDR_FREQ = 868304625
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'''
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Il semble que l'état des piles modifié l'offset de la température
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'''
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REMPLACEMENT = {
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'6d': '65',
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'6c': '64',
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'6b': '63',
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'6a': '62',
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'25': '65',
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'24': '64',
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'23': '63',
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'22': '62'
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}
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def getweather():
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'''
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Lit les données depuis le rtl_sdr
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La fonction pour la température est y = 0.05x-1268.8
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La fonction pour l'humidité est y = x/2
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Pour la vitesse du vent, la formule a était trouvée avec une regression
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linéaire sur une vingtaine de mesure.
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Pour le pluviomètre, il s'agit d'un compteur relatif ; la valeur est
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stockée pour pouvoir effectuer une différence avec la précédente.
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'''
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timestamp = datetime.now().timestamp()
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def temperature(raw):
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return round((0.05*raw-1268.8), 1)
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def humidity(raw):
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return int(round(raw/2))
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def wind(raw):
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return round((0.61264343715451175*raw-0.018142655636458116), 1)
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def rain(raw):
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current = int(raw)
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try:
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with open("/tmp/old_rain", "r") as tmp:
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old_rain = int(tmp.read())
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except FileNotFoundError:
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old_rain = None
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except Exception as err:
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logging.error("Error : " + str(err))
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return int(0)
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if old_rain is None:
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with open("/tmp/old_rain", "w") as tmp:
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tmp.write(str(current))
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return int(0)
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if current > old_rain:
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res = round(float(current-old_rain)*0.3, 1)
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with open("/tmp/old_rain", "w") as tmp:
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tmp.write(str(current))
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else:
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if (current+255)-old_rain < 254:
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res = round(float((current+255)-old_rain)*0.3, 1)
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with open("/tmp/old_rain", "w") as tmp:
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tmp.write(str(current))
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else:
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res = 0
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return float(res)
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p = subprocess.Popen(
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["sudo", "rtl_433", "-f", str(RTL_SDR_FREQ), "-q", "-A", "-T", "50"],
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE)
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stdout, stderr = p.communicate()
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try:
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frame = None
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for line in stderr.decode().splitlines():
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if '[00]' in line and '{79}' in line:
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frame = line.split()
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if frame[4] in REMPLACEMENT.keys():
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frame[4] = REMPLACEMENT[frame[4]]
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t = temperature(int(str(frame[4]) + str(frame[5]), 16))
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h = humidity(int(str(frame[6]), 16))
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w_median = wind(int(frame[7], 16))
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w_gust = wind(int(frame[8], 16))
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r = rain(int(frame[10], 16))
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break
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elif "Time expired" in line:
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logging.error("Aucune donnée reçu !")
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return None
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elif "Signal caught" in line:
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logging.error("Erreur de communication !")
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return None
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if frame:
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with open("/home/antoine/station_meteo.log", "a") as logfile:
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logfile.write(str(frame) + "\n")
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if -20 <= t <= 60 and 0 <= h <= 100 and r <= 10:
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donnees_meteo = {
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'date': float(timestamp),
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'temp': float(t),
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'hum': int(h),
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'wind': float(w_median),
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'gust': float(w_gust),
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'rain': float(r),
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}
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return donnees_meteo, int(frame[10], 16)
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else:
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logging.error("Donnée illogique :/")
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logging.error("T="+str(t)+" H="+str(h)+" R="+str(r))
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logging.error(str(frame))
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return None
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else:
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return None
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except Exception as err:
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logging.error("Impossible de décoder les données : " + str(err))
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for line in stderr.decode().splitlines():
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if '[00]' in line:
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logging.debug(line)
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else:
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logging.debug("Aucunes données valides reçues : « "
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+ line + " »")
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return None
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def main(): # pragma: no cover
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''' Renvoie les données sur une API si exécuté directement '''
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req = urllib.request.Request(API_URL)
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req.add_header('Content-Type', 'application/json; charset=utf-8')
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data = getweather()
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if data is not None:
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logging.info("Données : " + str(data[0]))
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data = json.dumps(data[0]).encode()
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req.add_header('Content-Length', len(data))
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try:
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reponse = urllib.request.urlopen(req, data, 2)
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logging.info("Données envoyées, le serveur a répondu « "
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+ str(reponse.code) + " »")
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except Exception as err:
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logging.error("Aucunes données envoyées : " + str(err))
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if __name__ == '__main__': # pragma: no cover
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while True:
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main()
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