i3blocks scripts for pomodoror package written in R by @silastittes, working with my fork which can be downloaded from this link: https://github.com/isinaltinkaya/pomodoror
Change /path/to/script/ in i3pomodoror.sh with path to script in your system.
Add this to your i3blocks.conf:
[i3pomodoror]
command=/path/to/script/i3pomodoror.sh
interval=60
Don't forget to change /path/to/script/ in line 2 with path to script in your system.