1 1
eyatsko

Orange PI PC2 enable 1-Wire Dallas D18 Thermo

Recommended Posts

Armbianmonitor:

Hello!

 

How to enable 1-Wire Dallas?

I tried this:

vi /boot/armbianEnv.txt

-----------------------------------------------------

overlays=w1-gpio
param_w1_pin=PA10
param_w1_pin_int_pullup=1

-----------------------------------------------------

Then I saw /sys/bus/w1/devices

   00-400000000000 -> ../../../devices/w1_bus_master1/00-400000000000/
   00-800000000000 -> ../../../devices/w1_bus_master1/00-800000000000/
   w1_bus_master1 -> ../../../devices/w1_bus_master1/

But there was not data.

 

I tried this:

vi /etc/modules

-----------------------------------------------------

g_serial
w1-sunxi
w1-gpio
w1-therm

-----------------------------------------------------

..and I even saw this:

   lsmod | grep w1
      w1_therm               16384  0
      w1_gpio                16384  0
      wire                   28672  2 w1_gpio,w1_therm

 

But with no effect.

 

May you help to understand what's wrong?

 

Kind regards,

Ellad

Share this post


Link to post
Share on other sites
4 hours ago, eyatsko said:

vi /etc/modules

-----------------------------------------------------

g_serial
w1-sunxi
w1-gpio
w1-therm

Don't load modules via /etc/modules, it is short-circuit the DT loader, the overlay will take care of loading with proper pin settings.

 

4 hours ago, eyatsko said:

00-400000000000 -> ../../../devices/w1_bus_master1/00-400000000000/

Usually, getting such strange device number is either using the wrong pin or not having a strong enough pullup, maybe try to use external 4K7 pullup instead of "param_w1_pin_int_pullup=1"

Share this post


Link to post
Share on other sites

Hello Martin!

 

First of all, I'd like to thank you! You were absolutely right about 4K7.

But now I have another problem: may you explain why 2 certain Thermometers of 6 disaplears sometimes, and I should reboot by power cycle my Orange board.

Sometimes they come back accidentally.  Two certain Dallas-es. Are they broken? And is there way to reset 1-Wire by CLI in Armbian?

 

Kind regards,

Ellad

Share this post


Link to post
Share on other sites

@eyatsko

What is the total cable length for your 6 sensors ? Do you use CAT5 / CAT6 ?

 

5 or 6 years ago, I tried to add 4 sensors in each of my first floor rooms (in the ceiling) -> 4 * 4 = 16 DS18B20 but it was way too much cable length (even with cat5) to have a consistent sensor read. I often had only 8 or 9 sensor available (and sometimes to whole bus disappeared). I tried lowering the pullup, it helped. I tried replacing my only pullup with 3 (and even 4) 15k (distributed along the cable) : it also helped but it was never perfect.

 

Finally I ended up with 4 buses of 4 sensors using 4 pins and it was flawless.

 

Less interesting for you but now I have a single ESP8266 for each room with a some i2c sensors (SI7021, ...). All my DS18B20 were donated or binned.

 

Hope this helps

Share this post


Link to post
Share on other sites

Hello friends!

 

The length of the whole line is approximately 60 cm. I use 6 sensors at all. When they all are online, they are read perfect.

OrangePI --6cm-- (4K7) --15cm-- [ba81] --8cm-- [4035] --9cm-- [c554] --10cm-- [5c11] --9cm-- [bbff] --9cm-- [55d9]      all are present

OrangePI --6cm-- (4k7) --15cm-- [        ] --8cm-- [4035] --9cm-- [        ] --10cm-- [5c11] --9cm-- [bbff] --9cm-- [55d9]      two are abscent

This always repeats. 6, then 4. then 6, then again 4, again 6.

 

Do you think 3K3 will correct the situation?

 

Kind regards,

Ellad

Share this post


Link to post
Share on other sites

It seems I got it... :-( I soldered with flux. I washed it no clean and it shortened Dallas pins.

Simply, isn't it..

 

Kind regards,

Ellad

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
1 1