My system is composed of:
Raspberry B, RFM12 adapter board 868Mhz, an external HDD, and a remote emonTx to monitor the solar generated electricity and house consumption.
This was in operation from 2013 to 2015, the last SD release was “2014-02-23 emoncms”
(boot_23Feb14.img and pi_hdd_stack_17jan14.img)
About mid 2015 stop to work. Only recently I had time to investigate, finding a defective Raspy.
Now I’ve purchased a new Raspberry P3, but the Emon System has evolved, and I’ve no detail about compatibility with dated hardware.
Considering that I have no interest to recover historical data, I would like to continue to use the external HDD and the RFM12 adapter, witch EmonSD release should I use?
There is only one emonSD image. That is designed for use on an SD card rather than a hdd but you can move the filesystem to a HDD which will give you more space and less chance of SD card failure. This guide might help
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## Move Operating System (Root) to External HDD
Due to the number of writes that the full version of emoncms makes, the lifespan of an SD card will almost certainly be shortened, and it is therefore recommended that you eventually move the operating system partition (root) to an USB HDD or to lower the write frequency to the SD card by using the [low-write mode](Low-write-mode.md).
Ensure that your Raspbian operating system boots into command console, and not into the desktop environment. This is because the desktop will automatically mount any attached USB drive, and prevent the script's operation.
Open the Raspbian configuration tool:
Select 'Boot Options' (this may be worded slightly different depending upon the system version) and set 'Text Console' as your prefered boot option.
Select 'OK' & 'Finish', and when prompted re-boot your system.
It is essential that emoncms was initially installed by following the [Raspberry Pi installation guide](readme.md) or you have used git to install a working version of emoncms on your Raspberry Pi.
Update emoncms to the current version:
cd /var/www/emoncms && git pull
Attach your USB hard disk drive to your Raspberry Pi ensuring that the drive's power requirements are met. This will usually mean attaching the drive via a powered USB Hub, or using a self-powered drive, as powering the drive from the Raspberry Pi's USB port almost certainly will not work.
Find & note the device name of your attached drive:
sudo fdisk -l