i2c stop working

Question

Hello! I am trying to solve my problem with i2c on a Raspberry Pi model B. I have build myself a little weather station with some sensors connected via i2c. It was working flawlessly for 3 months but now it suddenly stopped. I made sure the /etc/modprobe.d/raspi-blacklist.conf and /etc/modules configuration files are still as they were. The i2c_dev and i2c_bcm2708 modules are loaded after reboot but i2cdetect gives me: 
 Error: Could not open file `/dev/i2c-1' or `/dev/i2c/1': No such file or directory 
 I tried apt-get update , apt-get upgrade , rpi-update , ... but no luck so far. Can anyone help me please? Thanks for any ideas.

urkraft · Answer

Your problem is due to you running the following command: sudo rpi-update This command is only meant to be used by those involved in testing the latest experimental versions of the the Raspberry Pi kernel. Unfortunately the latest test version has introduced some very radical changes that will cause these problems. The solution to your problem is to roll back to the latest stable operational version. This can be done with the following command: sudo apt-get --reinstall install libraspberrypi-bin libraspberrypi-dev libraspberrypi-doc libraspberrypi0 raspberrypi-bootloader The last stable version is 3.12.35+ #730 You can find out which version you are using with this command: uname -a

johnbeetem · Answer

If everything was working fine and then something fails, it sounds like a hardware problem[*]. I would try downloading a fresh OS image to a different SD card and see if that's the problem. I think most SD cards are made for consumers and don't last as long as they should.

[*] I assume you've done obvious thinks like rebooting in case there was a memory leak or heap fragmentation, which are other ways things can fail after months of continuous operation.