Watermeter doesn't work
Posted: Saturday 21 May 2016 21:15
Guys, I'm still a newbie and probably I made a mistake or didn't do something important, please help with investigation 
I have watering system managed by domoticz, I'd like to add watermeter. As a hardware I have popular flow sensor from Aliexpress, powered by 3.3V, output is connected to GPIO4 (physical pin 7 on GPIO). Flowmeter is working I checked by oscilloscope, that on this pin there is a sq vawe, freq proportional to flow, so hw works perfectly.
Next I adapted a description found here on this forum:
viewtopic.php?f=36&t=10272
My adaptation: I deleted Gas section and changed ELEC into WATER, added a WATER.GPIO=4 and WATER.IDX=5 (according to idx of my dummy water counter in domoticz):
This script I copied into newly created file wodomierz.sh, made this file by chmod as executable and tried to run it. Unfortunately, after run this script my telnet session is frozing. No answer from raspberry. It works, I can use my domoticz at this time, also I can run parallel telnet session, but this one is not answering. Also in domoticz there is no reaction of my counter, it shows still 0.
So, where I'm wrong, or what should I do else? My domoticz is a new installation, maybe there should be something installed else?
I have watering system managed by domoticz, I'd like to add watermeter. As a hardware I have popular flow sensor from Aliexpress, powered by 3.3V, output is connected to GPIO4 (physical pin 7 on GPIO). Flowmeter is working I checked by oscilloscope, that on this pin there is a sq vawe, freq proportional to flow, so hw works perfectly.
Next I adapted a description found here on this forum:
viewtopic.php?f=36&t=10272
My adaptation: I deleted Gas section and changed ELEC into WATER, added a WATER.GPIO=4 and WATER.IDX=5 (according to idx of my dummy water counter in domoticz):
Code: Select all
#!/usr/bin/env python
import time
import json
import urllib2
import threading
import logging
import logging.handlers
import os
from gpiozero import DigitalInputDevice
GET_URL = 'http://127.0.0.1:8080/json.htm?type=devices&rid=%d'
SET_URL = 'http://127.0.0.1:8080/json.htm?type=command¶m=udevice&idx=%d&svalue=%d'
WATER_DELTA = 0
WATER_IDX = 5
WATER_GPIO = 4
WATER_COUNTER_LOCK = threading.Lock()
WATER_LAST_TIME = 0
WATER_POST_TIME = 0
def water_intr():
tme = time.time()
global WATER_DELTA
global WATER_LAST_TIME
global WATER_POST_TIME
with WATER_COUNTER_LOCK:
WATER_LAST_TIME = tme
if WATER_POST_TIME == 0:
WATER_POST_TIME = WATER_LAST_TIME
else:
WATER_DELTA += 1
logging.debug( 'Water counter tick: %d' % WATER_DELTA )
def main():
global WATER_DELTA
global WATER_LAST_TIME
global WATER_POST_TIME
global WATER_COUNTER
syslog = logging.handlers.SysLogHandler(address='/dev/log', facility='local1')
syslog.setFormatter(logging.Formatter('local_sensors.py: %(levelname)s %(message)s'))
logging.getLogger().addHandler(syslog)
logging.getLogger().setLevel(logging.INFO)
while True:
try:
res = json.load(urllib2.urlopen(GET_URL % WATER_IDX))
if res['status'] != 'OK':
raise Exception('Domoticz json error')
break
except Exception as e:
logging.warning( e )
time.sleep(30.0)
WATER_COUNTER = int(float(res['result'][0]['Data'][:-4]) * 1000)
# WATER_COUNTER = <Your initial count here * 1000, don't forget to remove after Domoticz updated!>
logging.info( 'Current water counter is: %d' % WATER_COUNTER )
waterSensor = DigitalInputDevice(WATER_GPIO, pull_up=True)
waterSensor.when_deactivated = water_intr
os.nice(-20)
logging.info('Polling loop starting')
while True:
time.sleep(60)
with WATER_COUNTER_LOCK:
if WATER_LAST_TIME > WATER_POST_TIME:
WATER_LOAD = WATER_DELTA * 3600 / ( WATER_LAST_TIME - WATER_POST_TIME )
else:
WATER_LOAD = 0
WATER_COUNTER += WATER_DELTA
WATER_DELTA = 0
WATER_POST_TIME = WATER_LAST_TIME
if WATER_LOAD != 0:
try:
res = json.load(urllib2.urlopen((SET_URL+';%d') % (WATER_IDX, int(WATER_LOAD), WATER_COUNTER)))
if res['status'] != 'OK':
raise Exception('Domoticz json error')
logging.info('Water load %.2f counter %d' % (WATER_LOAD, WATER_COUNTER) )
except Exception as e:
logging.warning( e )
if __name__=="__main__":
main()
So, where I'm wrong, or what should I do else? My domoticz is a new installation, maybe there should be something installed else?