Raspberry Pi 3B+ Heat (temperature)

Question

question

cedrock asked Aug 14, '20

Raspberry Pi 3B+ Heat (temperature)

Hi All

Just installed a raspberry Pi 3B+ with Venus GX Firmware as a gataway for my solar system on my boat.

It works pretty fine!

I used the official Pi3 Case for it.

I didn't install any heatsink or fan.

As it can get pretty warm in my boat, just wondering how the device can handle the temperature?

What happen if it would overheat? It will power down automaticly?

Is it nessesary to install a heatsink or fan or I'am good to go how it is right now?

Does anyone has some exprerience on that topic?

Many thanks

Raspberry Pi temperature

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Modifications Space

Node Red Space

Answer 1 · 2020-08-16T10:15:46Z

powerace answered · Aug 16, 2020 at 10:15 AM

Hi cedrock,

I've same RPi running in my RV without heatsinks. It is mounted in the 7 inch screen housing which allows a little airflow. When the RV is parked in the sun it becomes easily over 40 degree Celsius inside. Until now i did not experience a heat probleem with the RPI but it is well possible that the processor slows down its clockspeed although i cant really notice that using the gui. Ultimately i expect that the system simply locks up when it becomes to hot.

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Answer 2 · 2020-08-25T13:03:17Z

cedrock answered · Aug 25, 2020 at 01:03 PM

Hi Power Ace

I could monitor the System now for a Week on the Lake with high outside temperature.

I agree with you. Couldn't notice any issues so far.

Thank you for your answer

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Answer 3 · 2020-09-01T16:49:51Z

bradfordharley answered · Sep 01, 2020 at 04:49 PM

I am on the hard in mexico and it's regularly 100 f in the boat. The 3b+ is fine within an enclosure. You can view/monitor the temperature by looking at /sys/devices/virtual/thermal/thermal_zone0#. It's in C and divide by 1000. I also have a rpi4 onboard serving a different function, and it does need a fan..

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laurenceh commented · Sep 05, 2020 at 08:47 PM

Thanks for reminding me where to find the CPU temperature. I’ll write a dbus interface for it and being a temperature it will be visible to the VRM. I’ll post a link to the results here.

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laurenceh commented · Sep 06, 2020 at 02:30 PM

Well that went well:

I updated my temperature dbus service to include CPU temperature so it's now visible on the VRM and console.

I also checked the Rasberry pi advice and any CPU temperature below 80°C is fine. My Rasberry pi is in a 7" touch screen case with an analogue board attached.

If anyone would like the code I'll extract it form my other services and post it.

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screenshot-2020-09-06-at-151308.png (76.1 KiB)

screenshot-2020-09-06-at-151937.png (94.7 KiB)

kurtinge laurenceh commented · Jan 20, 2021 at 09:46 PM

Hi!

Great feature. Could you please share the configurations needed to accomplish this?

regards

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Kevin Windrem laurenceh commented · Jan 20, 2021 at 10:35 PM

Please put your Venus mods up on GitHub. Links here tend to get buried.

Thanks.

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laurenceh Kevin Windrem commented · Jan 21, 2021 at 09:49 PM

I’ll see what I can do over the weekend I am away from my narrowboat at the moment.

I’m not used to GitHub so may need to set up an account and work out how to use it.

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Answer 4 · 2021-01-23T18:07:28Z

laurenceh answered · Jan 23, 2021 at 06:07 PM

Right all posted to GitHub - as I'm away from my boat at the moment and did not want to break anything in the code I have left in a lot of code (just commented it out) so you get free extras:

How to read data from I2c and publish it to DBus
How to read data from extra adc inputs
How to interface to the Victron persistent setting interface

(so that you can store names, offsets and slopes for extra devices)

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powerace commented · Jan 24, 2021 at 04:12 PM

Thanks for sharing @laurenceh , i tried to find it on Github but could't. Do you have a link for me?

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laurenceh powerace commented · Jan 24, 2021 at 04:46 PM

Still getting to grips with GitHub I think I have made this under my own account it should be open for public reading.

https://github.com/LHardwick-git/Victron-Service

laurence

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powerace laurenceh commented · Jan 24, 2021 at 07:01 PM

Yes, now i found it. Will have a look and see if i can install it on my rpi3+ somewhere coming days.

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powerace laurenceh commented · Jan 30, 2021 at 03:08 PM

Hi @laurenceh,

I've got it working according to your instructions on Github. There is however a small step that can be a problem for other not so skilled users. In step 4 of your instructions you forgot to mention that file "dbus-i2c.py" also need to be made executable like the other files. In case you don't, you end up with permission problems when giving the command "bash start-i2c.sh".

And when it is all running the temperature appeared as battery temperature in my case. This is simply to be solved by manually give a correct name at the device properties.

Again thanks for sharing this with us!

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1612019602131.png (48.7 KiB)

laurenceh powerace commented · Feb 01, 2021 at 03:20 PM

Hi @PowerAce yes it was more a question that it did say it in the readme but just hidden because I did not know how to split lines in a gitHub README.

I have edited the readme (I guess you can resync to my main) the readme now more clearly says:

Set execute on the following files (Sadly storing things on github does not preserve execute bits)
dbus-i2c/i2c.py
dbus-i2c/start-i2c.sh
dbus-i2c/check-i2c.sh - this is just a simple file you can use to check if the service is running
dbus-i2c/service/run
/service/dbus-i2c

The command is
chmod a+x

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bleydh laurenceh commented · Sep 08, 2021 at 08:49 AM

Hi @LaurenceH,

it's working great - thanks for that. I've found that you need to chmod dbus-i2c.py as well to 'run' the script.

B

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Ingo laurenceh commented · Jan 30, 2021 at 04:42 PM

@LaurenceH Just to confirm, is this is for RPi Only as I see you have a couple of references to 'Victron GX' in your readme file. Will this work for other GX devices as well?

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laurenceh Ingo commented · Jan 30, 2021 at 07:36 PM

There is a good chance it will work in Victron GX devices as they also use Arm cores.

It is easy to check, have a look and see if the system device used by the service exists and cat the system file to see what it contains.

In the other hand it might rely on a specific device feature of the Arm processor used in the RPi in which case it won’t work. The check above will tell you one way of the other.

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Ingo laurenceh commented · Jan 31, 2021 at 03:55 AM

Thanks for the reply. I doubt however that it's possible to measure CPU temperature on the AM335x CPUs. From the datasheet it's internal and not user accessible without some work. They call it a Bandgap sensor or something used by the factory only.

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laurenceh Ingo commented · Jan 31, 2021 at 08:26 AM

That the sensor is embedded on the chip is kind of the point. It is accessible at register level on the AM335x so if the OS implements the interface then the temperature will be available. The Venus OS on both GX and RPi devices is based on the open embedded linux distro so the interface is likely to be consistent across Arm chips. Do check for the presence of the system file, it is really the only way to tell.

/sys/devices/virtual/thermal/thermal_zone0/temp

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Ingo laurenceh commented · Jan 31, 2021 at 09:20 AM

It's not present (empty directory). Let me rephrase, the path does not exist as per your example, the only path to a thermal directory is /sys/class/thermal and that one is empty.

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laurenceh Ingo commented · Jan 31, 2021 at 10:08 AM

Ok that is clear we should post an idea/suggestion for Victron to make the temperature available. The use case is clear - systems (mobile or static) in hot environments where the risk of device overheating needs to be mitigated.

I’ll post something later today.

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kurtinge laurenceh commented · Jan 31, 2021 at 05:01 PM

I absolutely agree. The system temperature is relevant in many installations. Especially where it is installed in small rooms together with other equipments as well

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laurenceh kurtinge commented · Jan 31, 2021 at 06:19 PM

I have posted the idea in modifications.

https://community.victronenergy.com/idea/75515/victron-gx-devices-internal-temperature-on-ui-and.html

Do upvote if you think it’s a good idea.

I have no direct interest as I run Venus on an RPi.

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dirkmuc commented · Jan 27, 2021 at 10:04 AM

Hello,

I just installed the addon to read the CPU temperature. Installation was easy thanks to the great tutorial from Laurence.

It directly integrates into the system (Venus Screen, VRM and Node-Red)

Next step is to use the code to integrate some BME280 Sensors. Hope I can manage it.

Thanks again for the great work!

Cheers

Dirk

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venus-os-screen.jpg (40.0 KiB)

vrm-cpu-temp.jpg (23.0 KiB)

node-red-cpu-temp.jpg (96.1 KiB)

kurtinge dirkmuc commented · Jan 27, 2021 at 10:24 AM

Looking forward to test this as well..... Also I am wondere how to get the tank levels into the gui as well. I have water and diesel, but not the waste tank. Is there a way to use the existing level sensors in the diesel and water tank? When it comes to the waste tank I am trying to figure out what I need besides of those: https://www.aliexpress.com/item/33041900609.html

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laurenceh dirkmuc commented · Jan 28, 2021 at 10:25 AM

BME280 appears to be i2c - you will need to add to config.txt.

Here is a line from my config shell script.

echo 'dtparam=i2c_arm=on' >> /u-boot/config.txt

You will need to add a new device class to the i2c.py lib to read the right registers of the BME280 as the device address and registers are different from the AM2320.

Good luck, I'm interested to hear how you get on.

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dirkmuc laurenceh commented · Jan 28, 2021 at 01:26 PM

Yes the BME280 is an i2c sensor. I use this sensor in my esp32 projects and there integration is not an issue thanks to exzellent libaries.

I will keep you updated.

Thanks again for your effort!

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mehlers dirkmuc commented · Feb 06, 2021 at 12:08 PM

Hi dirkmuc - have you managed to get your BME280 working....struggling with my limited knowledge....Best Mischa

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dirkmuc mehlers commented · Feb 15, 2021 at 02:57 PM

Hi,

I managed to get sensor readings on the console. I am struggling to get the data onto the dbus. It's a trial and error work for me since I do not now much about programming.

Cheers

Dirk

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laurenceh dirkmuc commented · Feb 15, 2021 at 07:48 PM

@dirkmuc if you cut and paste here an example of the console line or lines you need to use and what reply you get in the console. I’ll have a go at updating my code to include the BME280 support.

Laurence

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dirkmuc laurenceh commented · Feb 18, 2021 at 08:40 PM

@laurenceh

I managed to get temperature. Now I have to figure out how to get humidity and pressure onto the screen and into vrm....

Cheers

Dirk

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screenshot-20210218-213214.jpg (93.9 KiB)

dirkmuc laurenceh commented · Feb 19, 2021 at 10:43 AM

Hello @laurenceh, all

hopefully you can figure it out. As written above I can see the temperature value, but no humidity. I do not see any mistake as when I read the humidity value with

dbusservice['i2c-temp']['/Temperature'] = data.humidity

the output is correct. Humidity values are shown in the GUI, yes as a temperature ;-)

But I can not see both or in an ideal world I would like to add the pressure as well and see all three values in the GUI in one line like with the BMV. The pressure values are available with data.pressure.

I attached my version of dbus-i2c.py so if you have time it would be great to have a look into it. Of cause anybody else can also check it ;-)

Cheers

Dirk

dbus-i2c.py.zip

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dbus-i2cpy.zip (5.0 KiB)

laurenceh dirkmuc commented · Feb 19, 2021 at 05:11 PM

@dirkmuc

Well done -yes you are right the Console and VRM will only display temperatures automatically, but as you have seen you can label a temperature values as anything, you have already named a temperature as BME280 on the console and it works.

So you need two more temperature services and just give them names which tell you what they are:

I think something like the following will work, find this bit in the code:

dbusservice['i2c-temp']     = new_service(base, 'temperature', 'i2c',      'i2c Device 1',  0, 25, 7) 
dbusservice['i2c-humidity'] = new_service(base, 'humidity',    'i2c',      'i2c Device 1',  0, 25)
# Tidy up custom or missing items
dbusservice['i2c-temp']    ['/ProductName']     = 'BME280'
dbusservice['i2c-humidity']['/ProductName']     = 'BME280'

Change to

Note: you need to increment the instance ID and the setting ID for each new service of the same type, so se I have used 25-26-27.

dbusservice['i2c-temp']     = new_service(base, 'temperature', 'i2c',      'i2c Device 1',  0, 25, 7) 
dbusservice['i2c-humidity'] = new_service(base, 'temperature',    'i2c',      'i2c Device 1',  0, 26, 8)
# Tidy up custom or missing items
dbusservice['i2c-temp']    ['/ProductName']     = 'BME280 temperature'
dbusservice['i2c-humidity']['/ProductName']     = 'BME280 humidity'

Then change where you read the data to this.

        dbusservice['i2c-humidity']['/Temperature'] = data.humidity
        dbusservice['i2c-temp']['/Temperature'] = data.temperature

Yes I know its weird but it should work. The Console and VRM dont care what they are connected to as long as you pretend it is a Temperature!

Then just add extra lines to make a new service for the Pressure.

dbusservice['i2c-pressure']     = new_service(base, 'temperature', 'i2c',      'i2c Device 1',  0, 27, 9)
 dbusservice['i2c-pressure']['/ProductName']     = 'BME280 pressure'

And another line to read the data.

        dbusservice['i2c-pressure']['/Temperature'] = data.pressure

I'm not sure how Venus will react to a temperature of 1,013 which is 1 atm in hPa so perhaps convert to kPa which will sit around 101.3.

Let me know how you get on - sorry Im not at my my boat at the moment so I can't test my suggested changes.

NOTE you can change the device name in the Console settings. You dont have to change the code if you decide you would like to just change the name - the setting screen is here.

Good Luck - Laurence

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screenshot-2021-02-19-at-170748.png (37.6 KiB)

dirkmuc laurenceh commented · Feb 19, 2021 at 05:19 PM

@laurenceh

Thank you so much! I will test it over the weekend.

Cheers

Dirk

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dirkmuc laurenceh commented · Feb 20, 2021 at 01:40 PM

@LaurenceH

I tested your solution and yes that was the solution with one little addition.

Instead of

dbusservice['i2c-humidity'] = new_service(base, 'temperature',    'i2c',      'i2c Device 1',  0, 26, 8)

I had to use

dbusservice['i2c-humidity'] = new_service(base, 'temperature',    'i2c',      'i2c Device 1',  5, 26, 8)

The "5" made the difference. The same applied for the pressure, there I use "4, 27, 9"

OK, everything is in °C, but that's expected.

Thanks again fo your effort.

Next step is to combine them to read the values in one line.

My reading/learning starts now...

Cheers

Dirk

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venus-with-bme280.png (40.0 KiB)

laurenceh dirkmuc commented · Feb 20, 2021 at 03:34 PM

Glad it worked, thankfully the °C is not quite as obvious on the VRM.

You are right I should have spotted the 'id' parameter needs to be unique as well when declaring a service.

It really would be nice for Victron to make the minor mods needed in the dBus libraries and VRM to allow users to use the interface for generic values with programable scale text so we could label them kPa and % rel as we have now proved it is possible.

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mehlers laurenceh commented · Feb 20, 2021 at 05:24 PM

Thanks @LaurenceH and @dirkmuc - all data running from the BME 280 into my Venus Raspberry further on to VRM - and then via MQTT into my OpenHab home automation system, where I can show the real units...

If will see, if I can try this also for an SCD30 (which includes CO2)...

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dirkmuc mehlers commented · Mar 07, 2021 at 03:47 PM

Hello,

@LaurenceH @mehlers I have one question. I have the issue that the values are frozen after around 3 hours. When I change the update time the values are frozen accordingly. I assume that there is a kind of buffer overflow, but I really do not no where to look. The sensor is fine, I can read it out in the console even when the script is frozen.

Thank you for your support

Dirk

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Show more comments

Stefanie (Victron Energy Staff) ♦♦ commented · Jan 30, 2021 at 08:29 PM

Took me a bit to get it running on a Pi4. Had to make /service/dbus-i2c/run executable.

Thanks for your effort!

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kurtinge commented · Apr 24, 2021 at 02:59 PM

@LaurenceH Hi, after upgrading til 2.66 this seems not to work anymore. I understand a upgrade will delete this hack so I installed it again according to your instructions, but still can't see it working... Did you verify it on the 2.66 ?

Kurt

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laurenceh kurtinge commented · Apr 24, 2021 at 06:26 PM

I have just installed a fresh 2.66 test system today, I have the core dbus-i2c code working without problem (returning Rpi CPU temperature). Analogue interface is also working. I don’t have any i2c devices on my bench right now. I was going to try interfacing some 1Wire devices using owfs.

Can you explain what is not working? Have you checked the log files in /var/log/dbus-i2c for any clues?

If dbus-i2c is not running, you can run it from the command line and see what it reports on the terminal.

Laurence

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kurtinge laurenceh commented · Apr 26, 2021 at 08:19 AM

Hmmm..... .strange. I have done upgrading earlier without problems so I was thinking there where something with that particular version. I did review the files, rights and executables and so on - so I don't know. I am not at the boat now, but will take a look at the logs as I do not remember the content except it did not make sense to my limited knowledge :-)

I am in the situation to look at forwarding shh through the router, but from a security perspective I do not like the idea... so, then I have to wait :-|

I'll come back to you later on.......

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Kevin Windrem kurtinge commented · Apr 24, 2021 at 09:03 PM

I just installed this on an RPI 4 running v2.70~6 and it came right up.

If you are hand installing this, make sure the run files are executable or the service won't run.

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kurtinge kurtinge commented · Apr 27, 2021 at 12:14 PM

Did some checks and there was a file without the execute bit. Got it working now :-)

Tnx

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Answer 5 · 2021-02-01T12:00:42Z

kurtinge answered · Feb 01, 2021 at 12:00 PM

Thanks alot, @laurenceh !! Easy implementation. Really appreciate it. At the moment it is winter here so it stays at 44C. Theis feature will be very nice when summer is coming. The RPi is at the moment mounted in the same room as both the charger and the MPPT which is also neighbour room of the engine room. My guess is that this compartment will be quite warm if I go by engine for hours. Again, thanx alot !!!

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Answer 6 · 2021-09-24T07:06:00Z

bleydh answered · Sep 24, 2021 at 07:06 AM

Hi @LaurenceH ( @Kevin Windrem ) - I switched over from v2.70 to v2.80 large and for some reason I don't get it to work. It worked out of the box for me in v2.70, though in v2.80 the process just doesn't run. I'm using a RPi4 v1.2 4GB.

The temp is available /sys/devices/virtual/thermal/thermal_zone0/temp... I also tried to start dbus-i2c.py directly, though it complains about indentation errors etc.

I read elsewhere that the service needs to run now under /opt/victronenergy/service/dbus-i2c rather than /service/dbus- i2c - is that correct for v2.80 large?

The RPI cpu temp was only meant as a stepping stone, as I got the BME280 sensor, which I mainly wanted to get to work.

Many thanks,
B

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laurenceh commented · Sep 24, 2021 at 01:03 PM

@Bleydh the indentation errors are indicative of Perl problems and I know the Perl version has changed so I may need to refactor the code for Perl 3. I am just finishing my summer narrowboat vacation so will be back in my home office from next week and looking forward to bringing all my code up to dat with Venus OS versions for myself and others. Thanks for the heads up.

Laurence

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bleydh laurenceh commented · Sep 24, 2021 at 01:26 PM

Hi @LaurenceH - thanks for the quick reply and looking into it - once you've got the time. I'm also interested in the BME280 solution, if for any reason, that's on your radar as well.

Many thanks,
B

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lennycb laurenceh commented · Dec 27, 2021 at 07:34 PM

@LaurenceH hello, could you "rebuild" something here? I would like to continue using it >v2.80. Thanks very much!

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laurenceh lennycb commented · Dec 29, 2021 at 09:50 AM

Hi Lenny

I've been a bit busy with other things. I have noticed your post and confirm that will try to get started on the work to fix this.

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lennycb laurenceh commented · Dec 30, 2021 at 11:27 AM

@LaurenceH ah, great. I've already "adjusted" something here, as this was necessary when the Python version was changed. Please see if there is enough or if something is still missing. PS: Python is not my learned script language.

I have marked the changes with # ------------- in the file.

I also corrected tab errors and "indentations". No idea why this is important from version 3 onwards.

Just look at it :-)

dbus-i2c.zip

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dbus-i2c.zip (5.0 KiB)

Kevin Windrem lennycb commented · Dec 31, 2021 at 05:33 PM

I made some tweaks to the code that allows it to run in both python 2 and 3:

dbus-i2c.py.zip

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dbus-i2cpy.zip (5.5 KiB)

Kevin Windrem lennycb commented · Dec 31, 2021 at 08:26 PM

And one more tweak to make temp relays work (dbus service names can't include a dash (-)

dbus-i2c.py.zip

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dbus-i2cpy.zip (5.6 KiB)

crownroyal laurenceh commented · May 13, 2022 at 08:41 AM

@LaurenceH Would be nice if you accept the opened pull requests by kind contributors on github in order to make your code base compatible for 2.80+.

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laurenceh crownroyal commented · May 13, 2022 at 11:22 AM

Done

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johnny-brusevold commented · Jan 01, 2022 at 11:34 AM

Tested this on v2.80-21-lage-23

Works fine without any modification in the files.

Has two problems

The first is the softlink to /service/dbus-i2c disappears after a reboot, since the service folder is read-only. Fixed by creating a softlink by mounting the memory chip on a linux machine.

The second problem is by entering dtoverlay=w1-gpio.dtbo in /u-boot/config.txt it only flashes in the temperature reading in Remote Console so fast that it is not readable.

modprobe -r w1-therm w1-gpio fixes the problem and everything is fine.

If I do not use dtoverlay=w1-gpio, but only run modprobe w1-therm w1-gpio after reboot everything is fine too

EDIT

The symlink became problematic since I also had to add this on some more installations with v2.80-21-lage-23 (rpi 3b +)

This worked fine for me

nano /etc/init.d/w1-wirestart.sh

#! /bin/sh
ln -s /opt/victronenergy/dbus-i2c/service /service/dbus-i2c
modprobe -r w1-therm w1-gpio

update-rc.d w1-wirestart.sh defaults

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Kevin Windrem johnny-brusevold commented · Jan 01, 2022 at 05:25 PM

Your issue with the service is that as of v2.80~10, the root FS is read only and the services are handled as a file system overlay from /opt/victronenergy/service. Symlinks are no longer used. You need to COPY the service directory there. Then it will survive a reboot.

There are more details in the community post for the v2.80~10/11 release.

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johnny-brusevold Kevin Windrem commented · Jan 01, 2022 at 09:14 PM

@Kevin Windrem

Thanks! it worked excellently

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ralph johnny-brusevold commented · Jan 13, 2022 at 01:27 PM

Hi everybody.

I'm not quite sure that my knowledge on programming is enough, but I´m not able to run the service on my Rpi3+ under v2.80~36 with BME 280 sensor(s). At first wich files including the latest dbus-i2c.py-file from here should i copy where?Maybe a short manual helps me to install and run the service on my system.

Reading all posts on here makes me more confused than it helps me, sorry for that.

Thanks in advance

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johnny-brusevold ralph commented · Jan 13, 2022 at 08:14 PM

@Ralph

I use the dbus-i2c.py file that is posted over here in a zip file, as well as downloaded rest of the files from here

https://github.com/LHardwick-git/Victron-Service/tree/main/dbus-i2c

follow the instructions from readme

https://github.com/LHardwick-git/Victron-Service

Except the following point 3.

create a symlink from /service/dbus-i2c to /opt/victronenergy/dbus-i2c/service
ln -s /opt/victronenergy/dbus-i2c/service /service/dbus-i2c

should be

mkdir /opt/service/dbus-i2c
cp -r /opt/victronenergy/dbus-i2c/service/* /opt/service/dbus-i2c/

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olafd johnny-brusevold commented · Feb 09, 2022 at 08:11 PM

Hi

this Service is running:

https://github.com/LHardwick-git/Victron-Service

The cpu-Temp is displayed well but no Temp from a 1-Wire-Sensor!

The 1-Wire-Sensor is on raspis GPIO4 <— is that right?

Should something started additionally?

How do I get a identifierID of the 1-Wire-Sensor?

Is there a description for Venus OS and 1-Wire somewere ?

Could someone give me some hints with 1-Wire-Sensors please?

Thanks

Hardware: Raspberry 3B+

Software: VenusOS-2.8.2-Large

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johnny-brusevold olafd commented · Feb 09, 2022 at 08:28 PM

Hi, @OlafD

I have asked the same question here in the forum myself, without receiving any answer.

Guess it's as you mention for a 1 wire sensor

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temp-sensor1.png (64.4 KiB)

temp-sensor2.png (44.4 KiB)

olafd johnny-brusevold commented · Feb 11, 2022 at 03:14 PM

Hi @Johnny Brusevold

one 1WireSensor is working now.

Changes for that:

1. Copy this overlay to /u-boot/overlays/

https://drive.google.com/file/d/1CNDbKNRkZoLnMI109RHzxa6OIOvYGT4Z/view?usp=sharing

source:

https://community.victronenergy.com/questions/81215/connecting-1-wire-sensors-ds18b20-to-venus-os-on-a-1.html

add this to /u-boot/config.txt, for [all] at EndOfFile:

# 1-Wire Temperatursensor, Daten an Pin 4
dtoverlay=w1-gpio,gpiopin=4

and

chmod a+x /u-boot/overlays/w1-gpio.dtbo

2. Find the 1WireID (28-xxxxxxxxxxxx)

ls /sys/bus/w1/devices/
28-0123456789ab  w1_bus_master1

3. Add this to /opt/victronenergy/dbus-i2c/dbus-i2c.py and restart.

...
#update W1 temp
def update_W1():
...
-        ###sensor = W1ThermSensor()
-        ###temperature_in_celsius = sensor.get_temperature()
-        ###value =  temperature_in_celsius
+        fd  = open('/sys/bus/w1/devices/28-0123456789ab/hwmon/hwmon1/temp1_input','r')
+        value = float(fd.read())
+        value = round(value / 1000.0, 1)
        dbusservice['W1-temp']['/Temperature'] = value
+        fd.close

Caution:

If there is no 1WireSensor connected, the Temp reading flashes.

Hope that helps.

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2022-02-1wire-temp.png (7.6 KiB)

2022-02-1wire-info.png (23.2 KiB)

johnny-brusevold olafd commented · Feb 11, 2022 at 09:05 PM

@OlafD

Thank you for sharing well-detailed information

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Answer 7 · 2022-05-14T07:17:13Z

mrhappy answered · May 14, 2022 at 07:17 AM

Just a tip for node-red, for those who want a solution that does not include the mods in this thread. Using the "file in" node to read the contents of the temp sensor file in the linux file system of the raspberry Pi. The output of the node needs to be divided by 1000.

screenshot-2022-05-14-091037.png (1.4 KiB)

screenshot-2022-05-14-090933.png (19.8 KiB)

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Answer 8 · 2022-08-31T07:07:59Z

vrm answered · Aug 31, 2022 at 07:07 AM

Thanks for this great work. I will try it out immediately as it helps me reduce my RV by one extra Raspberry ;-)

NooB-question: This mod will disappear as soon as I update the firmware, right? Is there a chance to make it survive on the data-partition somehow?

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kurtinge commented · Aug 31, 2022 at 04:19 PM

yes it will unfortunatly be gone after update. If I do not remember wrong I thin @LaurenceH wrote somthing that did it easier, but not sure. Anyway - the implementation is quite easy after you have done it once so you might just do it manually. Also I realized that the temparature did not got very high so I have skipped it here and there

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laurenceh kurtinge commented · Aug 31, 2022 at 10:13 PM

Hi @kurtinge

I’m in the process of re writing all my services. I have some new ones to add and putting them all into one file is getting silly. I have now it un the pipeline:

The cpu temperature
I2c services temperature, humidity and analogue including analogue voltage tank sensors.
1-wire temperature and relays
An engine run time counter
A remote service to read other files via json.

Have a look at my Git hub for victron dbus services. I have not posted everything yet as I’m checking against 2.87 and 2.89 as I go.

To answer a question there are differences between 2.87 and 2.89 about how you get services to run and to re-install them after a firmware update. 2.87 need services to be added to /opt/victron energy/service but it is more difficult/complicated on 2.89. Apparently /data is safe for upgrades and scripts will need to be run to re-install the mods after an upgrade.

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kurtinge laurenceh commented · Sep 06, 2022 at 11:47 AM

How is the implementation of analogue voltage tank sensors? Do I need a addon card? It would be great to have this implemented

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Answer 9 · 2022-10-17T23:48:16Z

rikkert-rs answered · Oct 17, 2022 at 11:48 PM

Hello for everyone who is still interested in 1 Wire Sensors in Venus OS, I have a first version of t the Repo from LHardwick converted in an Setup Helper Package from Kevin Windrem

https://github.com/Rikkert-RS/VenusOS-TemperatureService

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laurenceh commented · Oct 19, 2022 at 03:30 PM

@Rikkert-RS

This looks great thanks, I look forward to using it.

I had not quite got to grips with Kevin's setup tool.

Laurence

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