Correctly checking for root==null

Signed-off-by: chmod <chmod@liss-e.gr>
Reactivated logging function
Measurement interval every 500ms
Hold cables at max value for >3 sec forces "previous" text being updated

Signed-off-by: chmod <chmod@liss-e.gr>
"Less" hardcoding stuff.. filename is declared final/static

Signed-off-by: chmod <chmod@liss-e.gr>
Graphics library

Signed-off-by: chmod <chmod@liss-e.gr>
!improtant!: TODO handle serials and actually measure something

Signed-off-by: chmod <chmod@liss-e.gr>