I forget to mention that in my SD card - I also have installed a media player OS (OpenElec) in addition to the Raspian OS

I followed your procedures and up to the part of :

git clone https://github.com/hallard/ArduiPi_OLED

and received the following error message and can't go further :

fatal: could not create work tree dir 'ArduiPi_OLED'.: No space left on device

I am using a 8GB SD card and I think I have enough space - don't I ?

I then issued df -Bm command to check space with following :

Filesystem 1M-blocks Used Available Use% Mounted on
/dev/root 4196M 4087M 0M 100% /
devtmpfs 483M 0M 483M 0% /dev
tmpfs 487M 0M 487M 0% /dev/shm
tmpfs 487M 7M 481M 2% /run
tmpfs 5M 1M 5M 1% /run/lock
tmpfs 487M 0M 487M 0% /sys/fs/cgroup
/dev/mmcblk0p6 63M 20M 44M 31% /boot
tmpfs 98M 0M 98M 0% /run/user/1000

Am I running out of memory or what, please advise - thanks