I was a bit upset last night. I couldn’t get my DHT11 to work. Tried several libraries until I got the idea (through a forum post) that I should use the old multimeter. Ahh, the power rails on my breadboard are split! After some rewiring everything is working.

Now I have a simple thermometer/hygrometer.

Next headache: the SD card acts strange. It just makes a loop of 256 lines of information, and I just can’t figure it out… Another program writing to SDcard, using the same library seems to work. Ah, well, debugging time then…