Cannot load w1 therm kernel modules on Raspberry Pi

[sandhan26]

On Raspbian Stretch, i am facing this issue.

Python 2.7.13 (default, Jan 19 2017, 14:48:08) [GCC 6.3.0 20170124] on linux2 Type "help", "copyright", "credits" or "license" for more information.

from w1thermsensor import W1ThermSensor Traceback (most recent call last): File "", line 1, in File "/usr/local/lib/python2.7/dist-packages/w1thermsensor/init.py", line 7, in from .core import W1ThermSensor # noqa File "/usr/local/lib/python2.7/dist-packages/w1thermsensor/core.py", line 316, in load_kernel_modules() File "/usr/local/lib/python2.7/dist-packages/w1thermsensor/core.py", line 310, in load_kernel_modules raise KernelModuleLoadError() w1thermsensor.errors.KernelModuleLoadError: Cannot load w1 therm kernel modules

[cyrisX2]

You need to update your boot file. sudo nano /boot/config.txt

Then at the end add the following dtoverlay=w1-gpio Save the file

Finally, reboot sudo reboot

[timofurrer]

@cyrisX2 Thanks for the info!

@sandhan26 did this work for you?

[Bernard26]

Hi, How to use different GPIO pin for DS18B20 data ? Thank you

[cyrisX2]

When you add the line to config, you can add the pin as well - default is 4. Just replace 'x' with whatever pin you want.

dtoverlay=w1-gpio,gpiopin=x

[Bernard26]

Thank you very much cyrisX2

[timofurrer]

I'm going to close this for now as it seems all questions are answered. @sandhan26 if it doesn't work for you, please let us know and I'll reopen this issue.

Cheers :beers:

[sandhan26]

@timofurrer @cyrisX2 @Bernard26 Sorry, for my delayed response. Let me elaborate first.

On my fresh installation of Raspbian Stretch Desktop, the BME280 sensor was working perfectly, with W1ThermSensor library.

But, after few days of lying dormant, i tried to use the sensor again with W1ThermSensor for some other project again. And this time it gives me the above error.

I had already tried what others have suggested, but the issue still persists.

this is the config.txt file with the modification you all suggested.

Here are the outputs of i2cdetect -y 1 and w1thermsensor ls

As you can see, the address of the BME280 is shown on the i2c port of Raspberry Pi as 76, which rules out the possibility of incorrect wiring.

[timofurrer]

Okay, that's unfortunate.

Can you provide:

• the version of w1thermsensor you are using?
• did you have root permissions when you've got the traceback posted in the first post?
• the output of ls /sys/bus/w1/devices?

[bsimmo]

Have you wired the DS correctly and the 4k7 resistor. I2C has nothing to do with it so ignore the BME. Also gpio 4 is the default pin. Normally I would use raspi-config to enable it unless anything specific is needed.

On 18 Nov 2017 09:00, "Timo Furrer" notifications@github.com wrote:

Okay, that's unfortunate.

Can you provide:

• the version of w1thermsensor you are using?
• did you have root permissions when you've got the traceback posted in the first post?
• the output of ls /sys/bus/w1/devices?

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[sandhan26]

@bsimmo yeah, the BME280 is wired correctly. And i did not use 4k7 resistor, as it was working without any resistors previously.

I did not understand your point "I2C has nothing to do with it so ignore the BME"

[sandhan26]

@timofurrer

1. I am using python3-w1thermsenso v1.0.3
2. I was logged into the default account 'pi'
3. I get the following list of folders 00-478000000000 00-c78000000000 w1_bus_master1

[sandhan26]

@timofurrer I would like to close these issue, as i have confused between BME280 vs DS18xx sensors. I am extremely sorry for that.

[bsimmo]

DS18B20 uses one-wire, this is not I2C. Hence you can ignore that the BME sensor.

You do not need a 4K7 for the BME, but for the DS18B20 (between data and 3V3).

But I've just seen your last message, I guess you've realised :-)

For further help I suggest asking on the RaspberryPI forum itself.

On 19 Nov 2017 08:17, "Sadhan Sarma" notifications@github.com wrote:

@bsimmo https://github.com/bsimmo yeah, the BME280 is wired correctly. And i did not use 4k7 resistor, as it was working without any resistors previously.

I did not understand your point "I2C has nothing to do with it so ignore the BME"

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[timofurrer]

I was logged into the default account 'pi'

You cannot load the kernel modules with the pi user. You have to be root. You can use sudo for that.

For further help I suggest asking on the RaspberryPI forum itself.

I second that!

🍻

[RubensZimbres]

Hello Timo, I'm running a Python 3 code to collect temperature using a sensor (LM35) in a Raspberry Pi 3 running on Ubuntu Core snap classic, using w1thermsensor 1.0.5 library.

I already edited the /boot/config.txt file as follows:

device_tree=bcm2708-rpi-b.dtb device_tree_overlay=overlays/w1-gpio-overlay.dtb dtoverlay=w1-gpio,gpiopin=7 dtparam=i2c_arm=on

Also /etc/modules

w1-gpio w1-therm

I changed the gpiopin from 4 to 7, but this does not seem to be an issue.

The problem is: when I run my Python script, I get the following error:

Traceback (most recent call last): File "Temp.py", line 2, in from w1thermsensor import W1ThermSensor File "/home/rubenszmm/.local/lib/python2.7/site-packages/w1thermsensor/init.py", line 7, in from .core import W1ThermSensor # noqa File "/home/rubenszmm/.local/lib/python2.7/site-packages/w1thermsensor/core.py", line 316, in load_kernel_modules() File "/home/rubenszmm/.local/lib/python2.7/site-packages/w1thermsensor/core.py", line 310, in load_kernel_modules raise KernelModuleLoadError() w1thermsensor.errors.KernelModuleLoadError: Cannot load w1 therm kernel modules

This is the contents of /sys/bus/ folder. There is no w1 folder, so I can't run "modprobe w1-gpio"

amba container hid mmc sdio usb clockevents cpu i2c platform serio workqueue clocksource event_source mdio_bus scsi spi

More details about this project at: https://github.com/RubensZimbres/Repo-2018/tree/master/Raspberry%20Pi3%20IoT-Project

Is there any fix I can do to overcome this error ?

Thanks in advance.

[bsimmo]

That's not a 1-wire temperature sensor?

Edit, It's not, it is an analogue sensor, so you cannot connect it directly to the Pi. You'll need some interface in between to convert it to a digital output. Either way, this module is no use to you.

On Wed, 27 Jun 2018, 13:32 Rubens Zimbres, notifications@github.com wrote:

Hello Timo, I'm running a Python 3 code to collect temperature using a sensor (LM35) in a Raspberry Pi 3 running on Ubuntu Core snap classic, using w1thermsensor library.

I already edited the /boot/config.txt file as follows:

device_tree=bcm2708-rpi-b.dtb device_tree_overlay=overlays/w1-gpio-overlay.dtb dtoverlay=w1-gpio,gpiopin=7 dtparam=i2c_arm=on

Also /etc/modules

w1-gpio w1-therm

I changed the gpiopin from 4 to 7, but this does not seem to be an issue.

The problem is: when I run my Python script, I get the following error:

Traceback (most recent call last): File "Temp.py", line 2, in from w1thermsensor import W1ThermSensor File "/home/rubenszmm/.local/lib/python2.7/site-packages/w1thermsensor/ init.py", line 7, in from .core import W1ThermSensor # noqa File "/home/rubenszmm/.local/lib/python2.7/site-packages/w1thermsensor/core.py", line 316, in load_kernel_modules() File "/home/rubenszmm/.local/lib/python2.7/site-packages/w1thermsensor/core.py", line 310, in load_kernel_modules raise KernelModuleLoadError() w1thermsensor.errors.KernelModuleLoadError: Cannot load w1 therm kernel modules

This is the contents of /sys/bus/ folder. There is no w1 folder, so I can't run "modprobe w1-gpio"

amba container hid mmc sdio usb clockevents cpu i2c platform serio workqueue clocksource event_source mdio_bus scsi spi

Is there any fix I can do to overcome this error ?

Thanks in advance.

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[timofurrer]

I'm running a Python 3 code ... Traceback (most recent call last): File "Temp.py", line 2, in from w1thermsensor import W1ThermSensor File "/home/rubenszmm/.local/lib/python2.7/site-packages/w1thermsensor/init.py", line 7, in ...

It's not the issue here, but you are actually running Python 2.7 instead of Python 3.

That's not a 1-wire temperature sensor?

Exactly - That's certainly one of the problems here. Thanks @bsimmo

However, you should be able to load the kernel modules any way. I guess you don't have the appropriate permissions. If you want to load the kernel modules from Python with w1thermsensor you have to run it as root. See https://github.com/timofurrer/w1thermsensor#disable-kernel-module-auto-loading

[RubensZimbres]

Thanks @bsimmo and @timofurrer I will get the appropriate sensor.