@Grumpy_Mike
Thanks, I was aware that I had to cut down the 12v to 5.7v but I thought that was done differently.. 
What is your best practice for that then??
@CrossRoads
I looked a bit closer in the Reference page and yes I totally misunderstood it 
I guess that gives me the problem of missing 2 pins. I also could use a shift register but I want to keep this project as simple possible and also I could drop the temperature sensor which only gives me the headache of how to convert the 12v to a 5.7 and eventually to 5v.
@KE7GKP
- Well I could free up a digital pin by swapping it with a LED column.
- That is a nice technique too I'm ganna keep that in mind! Thanks for sharing
