I2C not recognizing BME280

[seabeam]

Hello everybody,
I have soldered the pins to the bme280 sensor and wired this up to my PI:
Pin 1 - VIn
Pin 3 - SDI
Pin 5 - SCK
Pin 9 - GND

I have checked with a multimeter on the VIn and GND pins and I am getting the 3.3V.

I have enabled the I2C on the raspi-config and have downloaded the i2C-tools.
sudo update in between al these steps and rebooting.

When I type

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sudo i2cdetect -y 1

I get no detection.

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root@raspberrypi:~# i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- -- 

When I try:

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root@raspberrypi:~# ls /dev/i2c*
/dev/i2c-1
root@raspberrypi:~# 

I have purged and reinstall the i2c-tools and rebooted after that.

Also I have checked:

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root@raspberrypi:~# lsmod | grep i2c
i2c_bcm2835             7167  0
i2c_dev                 6913  0
root@raspberrypi:~# 

Does anybody have any idea where I can keep on looking where the problem may be?? Is it the bme280 ???

Thanks in advance

[Andyroo]

Is it configured for a SPI connection?

Do you have a link to the maker of the card?

[seabeam]

Hi,

https://learn.adafruit.com/adafruit-bme ... duino-test

The sensor is setup for both i2c and spi. I have wired it up for the i2c setup.

[joan]

To double check it's not an address problem you could try connecting SDO to ground or 3V3.

[Andyroo]

Odd question - are you using a model B?

If so it would be:

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sudo i2cdetect -y 0

Note the zero

Is this the only sensor connected to the Pi?

[seabeam]

Hi guys just solved the problem.

I had jumped the step of checking the modules, and there was missing the required module for this particular sensor. I found out this by rechecking what Andyroo was asking:

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root@raspberrypi:~# i2cdetect -l
i2c-1	i2c       	bcm2835 I2C adapter             	I2C adapter

And then when to

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root@raspberrypi:~# nano /etc/modules

And saw that i2c-bcm2835 was missing. Added it:

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# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.

i2c-dev
i2c-bcm2835

And

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root@raspberrypi:~# i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- 77 

So thanks all for the quick answers!!!

[bensimmo]

shouldn't that all have been sorted when you enabled it in Raspi-config.
I've never needed to alter modules for a long time for anything.

What OS are you using?
and from when ?

Latest Raspbian?

[seabeam]

hi Benissimo,

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pi@raspberrypi:~ $ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
NAME="Raspbian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=raspbian
ID_LIKE=debian

I have back stepped : removing the added module and the sensor is still being detected, the system works. Which makes me wonder what has really happened. I have rebooted the PI and it is still going good. I am running the PI through VNC from a ubuntu 14.04 computer.

Thanks all.