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I finally decided to abandon plans to use the 'low write load' version of emoncms as I found it didn't co-exist too well alongside other software, such as samba & minidlna so I've gone back to emoncms git 'master' version.

Followed the linux installation guide to the letter, followed by the raspberrypi module instructions on github. But found that none of the inputs were being picked up by emoncms, and the led on the rfm12pi hardware remained unlit. A check via my browser showed that the the group/frequency & baseID details are correct and the 'RFM12 to Pi interface script is up and running' is indicated.

If I run;
$ sudo service rfm12piphp restart log
it restarts ok, but also reports
$ PHP Warning:  Module 'dio' already loaded in Unknown on line 0

and if I tail the log, I see;

Fatal error: Call to a member function fetch_object() on a non-object in /var/www/emoncms/Modules/raspberrypi/raspberrypi_model.php on line 29
DATA RX:> 15i
DATA RX:> 15i

A hardware test was made by fitting a different SD card containing the 'low write load' version, and my inputs appeared and updated as normal, so it appears to be a software fault.

Paul