1-wire and Dallas DS18b20

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luetzel replied at Tue Jan 20, 2015 08:02
No, unfortunately, it wasn't enough to set the frequency scaling in rc.local. Only both, keeping t ...

Ah, good to know.

Have you tried already mainline kernel (there the whole cpufreq thing is currently missing/different)? The most simple way seems to be trying out one of Igor's images with kernel 3.19.0-rc4:

If the problem persists then it might be worth to bring it to the attention of the kernel hackers actively developing mainline/sunxi-next.

I've had myself cpufreq related problems with 2 DHT22 (when cpufreq exceeded 1008 MHz they didn't work reliable any longer) but currently not the time to dig in deeper.

So far I've tested only the stable 3.4.103 branch. I would like to test a different kernel, but at the moment I do not have access to a second BananaPi. Currently, my BananaPi runs headless as a self-hosted WebServer (Nginx/Wordpress/MySQL), so I don't want to make any changes except bug fixes. Except for the cpu_freq issue, the system is very stable with an uptime of more than 4 to 6 weeks. I prefer to run a customized kernel with less hardware support (don't need GPU, eth0 support and other things at all).

Hi everyone,

After following the instructions, I only found "w1_bus_master1" in "/sys/bus/w1/devices".
The temperature sensor worked without problem when I had it connected to an Arduino.

I tried to follow along with the steps described in this thread and here: ... 7712839943464951942

I found "script.bin" in "/boot" directly, there was no "/boot/bananapi". (running Raspbian GNU/Linux 7 (wheezy)) I copied the modified version of script.bin to both positions for good measure. (tried only overwriting the old file, without success)

I don't see any error message or other clue.
Do you have an idea what more I could try?

Thanks in advance!

Not sure if my post still is valid, I tried this a long time ago but it worked: ... 12&fromuid=1602

Thank you, i did come across your post,
Unfortunately I still can't figure out how to make the Bananapi read the sensor.
My CPU frequency seems high enough:
sudo cat /sys/devices/system/cpu/cpu1/cpufreq/cpuinfo_cur_freq

In a link in the post you linked to: ... ure-sensing/ds18b20
There is a file mentioned which I don't have: /boot/config.txt

I assume this is a difference beween Raspberrypi and Bananapi, am I right?

Just curious, does the folder /sys/bus/w1/devices/28-*** appear and disappear directly when you connect or remove the sensor, or does this require a reboot?

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