I am back to school, with some mate from secondary, some work colleague as well. So we had electronic assignment which are way over due. It seems that I know how to do it, quite simple just voltage divider using some potentiometer. Then we need to set up some sort of permission using chmod. And the teacher is quite upset because it is long overdue. I don’t have permission to set the permission. So I had to get someone to set my permission first.