New parts on the way
One of the things I was lacking all the time in my Arduino mini-projects was resistors - most of the projects we see on the internet require you to use some of them. As an absolute beginner in electronics I chose to buy a 480 resistor set which contains resistors with 16 different values, each of them in 30 pieces:
Besides that I also ordered a couple of photodiodes to use for my upcoming line-follower robot. Line follower robot was one of my first aims when I purchased the Arduino. So I'm quite close to getting started with it.