IOError: [Errno 110] Connection timed out about adafruit_python_bmp

[tdicola]

Hrm that's odd, one thing I'm curious about are you using a Pi 2 or original Pi? I've seen a similar intermittent error with a different I2C device on the Pi 2 and am curious if you're seeing something similar here too.

edit: Also just to rule out a conflict with the devices, do they work in isolation? I.e. pull the si1145 off the Pi and just try it with the BMP sensor and vice-versa.

[lrusak]

I'm using an original first revision RPi B.

After more digging it seems to be an issue in the kernel.
raspberrypi/linux#865
I see this in dmesg,

[   22.686503] i2c i2c-0: transfer setup timed out
[   24.711928] i2c i2c-0: transfer setup timed out
[   26.726649] i2c i2c-0: transfer setup timed out
[   28.736568] i2c i2c-0: transfer setup timed out
[   30.741944] i2c i2c-0: transfer setup timed out

I'll try rebuilding with the latest kernel or try using an older kernel if that doesn't work.
currently I'm using 3.19.0 and I have the following line in config.txt

dtparam=i2c_arm=on

Will report back after I test some different kernels.

[tdicola]

Ouch, thanks for linking to that bug--that's somewhat annoying to see the issue at the kernel level. If it helps, you might try the stock Raspbian release that's on the 3.18 kernel: http://www.raspberrypi.org/downloads/ Good to know that 3.19 might have some issues right now.

[jeanlemotan]

This seems to be a different issue than the one in the linked issue. You are getting a "transfer setup timed out" while issue #865 is about "transfer timed out". Can you detail a bit your setup pls?

• Do you have a Pi camera attached?
• What i2c baud are you using?
• Combined transactions on? (you can just paste the kernel params from cmdline.txt here)
• Overclocked Pi?
• Do other sensors work?
• Did you try an older kernel ( < 0ca4c1f57c84bb114641176d63d16ce345f5a95d)?
• When you get bad readings do you have a simultaneous timeout in dmesg?

[beheh]

I'm seeing the same issue with a different sensor (MPL3115A2), so I believe it is a module problem. In case it helps, my setup (running Linux raspberrypi 3.18.7-v7+ #755 SMP PREEMPT Thu Feb 12 17:20:48 GMT 2015 armv7l GNU/Linux):

• No camera attached
• Tried 100000, 32000, 5000 with the same error everytime.
• Yes, since the sensor requires it
• No
• Only one sensor to test with right now
• Running 3.18
• Yes: [ 1923.121754] i2c i2c-1: transfer setup timed out

[javiisanchez]

Hi,
I'm seeing the same issue, first the sensor did a good reading, after I put a while to see continuosly the data and the exception appeared (after half minut), and now the sensor wasn't connected to the I2C bus. (with the comand i2cdetect -y 1 I don't see any sensor, that before, I've saw.
Can you help me?

[ladyada]

hiya we're closing these issues and archiving this repo because this library has been deprecated!

the bmp085 and bmp180 are no longer made, and are replaced by the bmp280 + friends

we are now only using our circuitpython sensor libraries in python

check out this guide for using the bmp280 with python!
https://learn.adafruit.com/adafruit-bmp280-barometric-pressure-plus-temperature-sensor-breakout