Archived Forum

Hi,

Attached is a short php script to monitor my Raspberry Pi that is running Emonhub+EmonCMS (with a hdd).

It posts the following data on EmonCMS: memory used,  memory shared, memory buffers, memory cached, GPU temp, CPU temp, CPU usage. Just modify the node id that will receive data and put you APIKEY.

- Copy this script into the home pi directory  (/home/pi)

- Rename it (php file can't be attached in that forum):

mv /home/pi/SCRIPT_Post_info_RPI.txt /home/pi/SCRIPT_Post_info_RPI.php

- Modify the nodeid, the APIKEY and the target

nano /home/pi/SCRIPT_Post_info_RPI.php (modify it, save and exit with Ctrl-X / Y / Enter)

- To post data on EmonCMS, run  :

php /home/pi/SCRIPT_Post_info_RPI.php

To run this script every minute, add a cron task :

sudo crontab -e and add the following line at the end of the file  :   * * * * * php /home/pi/SCRIPT_Post_info_RPI.php. Save and exit with Ctrl-X / Y / Enter

Then restart cron service : sudo service cron restart

First observation

I noticed that the used RAM was always increasing on my RPI. So, I was worrying about a memory leak. In fact, it seems to be normal as it's only disk caching, a normal behavior on linux machine (See http://www.linuxatemyram.com/). When clearing the memory cache by running "sudo /sbin/sysctl vm.drop_caches=3", the RAM used magically comes back (see attached). Now, I will pay attention to the "real free memory" : mem free + mem buffer + mem cached.

Second observation

I put my RPI + a hub USB + a USB HDD in plastic junction box to make it cleaner. I'm using the pre-drilled holes for ventilation (see attached). When the box is in horizontal position, the RPI's CPU gets hot (65°C). When the box is in vertical position, the RPI's CPU gets colder (55°C). The natural chimney effect with aeration is better in that position. Do you think it can be a problem for the hdd (which is also in vertical position )

Eric