No llamamos a este artículo un tutorial ya que no se explicarán todos los pasos de la configuración del sensor. Puede ser la idea de este artículo mostrar el panorama general de la instalación de sensores en una Raspberry Pi bajo el framework Istsos que implementa el estándar SOS.

Página de github de Istsos:

github.com/istSOS/istsos2

Video

La bitácora esta separada en varias partes

Parte física

Instale el sensor como se explica en las figuras y fotos.

En un terminal de Raspbian

Cuando instale Raspian, establezca el nombre de usuario en "istsos"

Importa el paquete para leer el sensor de temperatura.

pip install python3-w1thermsensor

pip install python-dotenv

Habilitar el acceso a los pines GPIO

sudo raspi-config

3 Interface Options > I8 Remote GPIO > Yes

Habilitar la superposición de sensores

Necesitas actualizar tu archivo de arranque

sudo nano /boot/config.txt

Luego al final agrega lo siguiente

dtoverlay=w1-gpio, gpiopin=4

Grabe el archivo

Finalmente reinicie

sudo reboot

Obtener el id del sensor

cd /sys/bus/w1/devices

ls

Verifique la identificación del sensor como 28-XXXXXXXXXXXX donde X.. es la identificación del sensor

En la carpeta /opt/istsos, cree un archivo tempInsertObservation.py

sudo mkdir /opt/istsos

sudo nano /opt/istsos/tempInsertObservation.py

Pegue este código

#!/usr/bin/env python
# coding: utf-8

from requests.auth import HTTPBasicAuth
from requests.packages.urllib3.exceptions import InsecureRequestWarning
import requests, json, os
from datetime import datetime
from dotenv import load_dotenv
from dateutil.tz import tzlocal
from dotenv import load_dotenv
from w1thermsensor import W1ThermSensor, Sensor

sensor = W1ThermSensor(Sensor.DS18B20, '0000071dacba')

#create a file env.txt with 
#USER='XXXX'
#PASSWORD='XXXX'
load_dotenv('/opt/istsos/env.txt')
user = os.getenv('ISTSOSUSER')
password = os.getenv('ISTSOSPASSWORD')

requests.packages.urllib3.disable_warnings(InsecureRequestWarning)

auth = HTTPBasicAuth(user, password)
url = 'https://apps.hatarilabs.com/istsos'
service = 'temperature'
procedure = 'genericSensor'
off = 'tempnetwork'

# Requesting a describe sensor mainly to store the assignedSensorId
resProcedure = requests.get(
    '%s/wa/istsos/services/%s/procedures/%s' % (
        url, service, procedure), auth=auth)
print(resProcedure)
procedureData = resProcedure.json()['data']

# Preparing "io" object to send
observedProperties = requests.get(
    '%s/wa/istsos/services/%s/operations/getobservation/offerings/'
    '%s/procedures/%s/observedproperties/:/eventtime/last' % (
        url, service, off, procedure),
    params={
        "qualityIndex": "False"
    }, auth=auth)

io = {
    "AssignedSensorId": procedureData['assignedSensorId'],
    "ForceInsert": "true",
    "Observation": observedProperties.json()['data'][0]
}

#humidity, temperature = Adafruit_DHT.read_retry(DHT_SENSOR, DHT_PIN)
temperature = sensor.get_temperature()
print("Recorded temperature of %s celsius" % temperature)

eventtime = datetime.now(tzlocal())

io["Observation"]['samplingTime'] = {
                    "beginPosition": eventtime.isoformat(),
                    "endPosition": eventtime.isoformat()
                }

ob = [eventtime.isoformat(),str(temperature)]

io["Observation"]['result']['DataArray']['values'] = [ob]

resInsert = requests.post('%s/wa/istsos/services/%s/operations/insertobservation'%(url,service),
                    data=json.dumps(io), auth=auth)

Defina un trabajo de cron:

crontab -e

Añada la siguiente línea:

* * * * * /usr/bin/python /opt/istsos/tempInsertObservation.py

Ejecute el comando una vez y verifique que se haya realizado un registro:

/usr/bin/python /opt/istsos/tempInsertObservation.py

Compruebe si el cronjob se está ejecutando:

sudo tail -100 /var/log/syslog

En otra computadora

Recupere los datos de salida como un dataframe de pandas con este cuaderno de Ipython:

from requests.auth import HTTPBasicAuth
from requests.packages.urllib3.exceptions import InsecureRequestWarning
import matplotlib.pyplot as plt
import requests, json, os
from dotenv import load_dotenv
import pandas as pd

requests.packages.urllib3.disable_warnings(InsecureRequestWarning)

#create a file envViewer.txt with 
#USER='XXXX'
#PASSWORD='XXXX'
load_dotenv('envViewer.txt')
user = os.getenv('ISTSOSUSER')
password = os.getenv('ISTSOSPASSWORD')

auth = HTTPBasicAuth(user, password)

url = 'https://apps.hatarilabs.com/istsos'
service = 'temperature'
procedure = 'genericSensor'
off = 'tempnetwork'

beginTime = "2023-06-01T00:00:00-05:00"
endTime = "2023-06-01T20:00:00-05:00"
# Preparing "io" object to send
observedProperties = requests.get(
    '%s/wa/istsos/services/%s/operations/getobservation/offerings/'
    '%s/procedures/%s/observedproperties/:/eventtime/%s/%s' % (
        url, service, off, procedure,beginTime,endTime),
    params={
        "qualityIndex": "False"
    }, auth=auth)

observedList = observedProperties.json()['data'][0]['result']['DataArray']['values']

observedList[:5]

[['2023-06-01T10:49:04.650563-05:00', 23.625],
 ['2023-06-01T10:50:04.170496-05:00', 23.625],
 ['2023-06-01T10:51:05.050523-05:00', 30.5],
 ['2023-06-01T10:52:04.490570-05:00', 29.125],
 ['2023-06-01T10:53:04.810532-05:00', 28.0]]

observedDf = pd.DataFrame(columns=['Date','Temp'])
observedDf

	Date	Temp

observedDf['Date'] = pd.to_datetime([i[0] for i in observedList])
observedDf['Temp'] = [i[1] for i in observedList]
observedDf = observedDf.set_index('Date')
observedDf.head()

	Temp
Date
2023-06-01 10:49:04.650563-05:00	23.625
2023-06-01 10:50:04.170496-05:00	23.625
2023-06-01 10:51:05.050523-05:00	30.500
2023-06-01 10:52:04.490570-05:00	29.125
2023-06-01 10:53:04.810532-05:00	28.000