DS18B20 Directly connected to a RPI

[crazynight]

Is it possible to have a DS18B20 directly connected to the RPI which is running domoticz, it seems overkill to have the RPI and a nodemcu in the same room.

Some simple instructions or a link to some would be appreciated.

TIA

[mtsinc]

I don't see why not. Adafruit has an example of the DS18B20 connected to a Pi GPIO port and the Pi is a multi-tasking OS.

https://learn.adafruit.com/adafruits-ra ... g/hardware

The tricky part is in figuring out what channel to feed the measurements into Domoticz with. But if a superficial reading of the above article is correct, then I think that they're publishing the sensor as an OS device whose name can be used in the 1Wire device hardware configuration.

[rv24531]

I currently do it with a mix of Node-Red and json post data into a virtual temperature sensor.

Although I only use Node-red because I have other magic going on that pushes data into Domoticz, I'm sure there are perl/php/others out there that can come up with a command line and cron script to automatically post this data into domoticz, however Node-Red makes it a piece of cake to pull and temperature and output it into a message.

As far as the http post/get command, this is what I use in reference to the Domoticz/JSON commands ... localhost:8088/json.htm?type=command&param=udevice&idx=19&nvalue=0&svalue={{payload}} and it sends updates the sensor (IDX #19) with the value.

Piece of cake, maybe a overkill, but it takes longer to install node-red than it does to set it up to push data into Domoticz

Also, don't forget to ENABLE 1-wire support in raspi-config or it will never work

Need help, just ask!

[gerardvs]

I do almost the same to measure the temperature of the cabinet where the pi is situated and use a simple quick and dirty python script.

Code: Select all

import os
import glob
import time
import requests

# sometimes needed
#os.system('modprobe w1-gpio')
#os.system('modprobe w1-therm')

base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '10*')[0]
device_file = device_folder + '/w1_slave'

idx = "67"	
dUrl = "http://localhost:8080"


def read_temp_raw():
   f = open(device_file, 'r')
   lines = f.readlines()
   f.close()
   return lines

def read_temp():
  lines = read_temp_raw()
  while lines[0].strip()[-3:] != 'YES':
     time.sleep(0.2)
     lines = read_temp_raw()
  equals_pos = lines[1].find('t=')
  if equals_pos != -1:
     temp_string = lines[1][equals_pos+2:]
     temp_c = float(temp_string) / 1000.0
     return temp_c

degree = read_temp()

sensUrl = dUrl + "/json.htm?type=command&param=udevice&idx=" + idx + "&nvalue=0&svalue=" + str(round(degree,1))
r = requests.get(sensUrl)

[chrisfraser05]

these ones?

https://www.homecontrolshop.com/product ... ure-sensor

[kimot]

Domoticz wiki does not works?

https://www.domoticz.com/wiki/1Wire

[alarm_guy1]

The Wiki is correct.
I have followed the instructions and it is working.
However what is Ambiguous is this line
Note: When using GPIO, set OWFS Path to nothing. After adding 1-wire (system) the sensors will eventually show up in the log.

SEE ATTACHED PIC

1WIRE.jpg (187.99 KiB) Viewed 5328 times

[pannekoek]

Well, it seems that I have the same problem. Were there any solutions to get this going?
Thanks in advance

[pannekoek]

Refresh devices did the job. PANNEKOEK. Some day everything is ok

[alarm_guy1]

I now use an Esp8266-01 running easyesp with a temp sensor DS18B20, I am lucky enough to have access to my wired alarm and use a 12v to 3.3v regulator to power the ESP, being wireless they are cheap too

[pannekoek]

Yes, I use a nodemcu. Works very nice. The only thing is that there is only room for a few sensors.

And the place where I want to put these, there is no wifi.

[pannekoek]

Well, there are some problems. The ds18b20’s direct connected to the raspberry seem to freze after a few hours. They keep displaying the same temp.
The sensors conected via a nodemcu keep working without a problem.
Any idea someone?
Thanks already

[alarm_guy1]

Yes I have 2 running now for some months, 1 upstairs and one downstairs both on ESP8266-01's flashed with mega-20190903
One is powered from my alarm panel and the other via a power supply maybe 12v down to 3.3v. all appear to work well then I have another on on a Fibaro module outside. I also have a unit ping setup for my various Esp's, they get pinged every 20mins or so and if they go down I get an email.... Since march this year neith ESP has given me any issues

[pannekoek]

Here the same, but without email notification. Esp is running great. But the place where I want to measure too has no wifi, only lan. So I connected three bs18 direct to the raspberry. Runs ok, but only for a short time. Don't know what could be wrong.

[uzturre]

hello:
https://easydomoticz.com/forum/viewtopic.php?f=6&t=9335

[pannekoek]

Thanks, already followed all those steps. Just did it again. Can't find anything. Maybe bad connection somewhere? It functions for some hours and then stays at exact the same temp.

[pannekoek]

Ok, it seems a cable problem. We'll see what happens this week.

And now e-mail notifications? We use office 365 but can't get the job done. Raspberry is only for my lokal network. Is that a problem?