After doing a few “hello World” apps with a breadboard and some LEDs and various ICs, I went ahead and started to play with the nano that came in last week.
I was able to upload sketches, write some basic programs (like one that made the built-in led blink faster and faster, or slower and slower over time, and etc.)
Then I tried to do the “Hello World” test using just D13 pin, but no luck (at first it wasn’t working at all, then I was obviously doing something wrong, because the LED on pin13 would light up when the built in led on 13 was off, and vice versa. Today I took another stab at it after I got some more LEDs and a new breadboard, and then realized there are actually 2 ground pins on the nano. I had been using the one on the right side (above the 5v on the side with all the analog pins). I used the one on the left, and everything was solved.
I’m sure there is a really easy and obvious answer as to why there are 2 pins (and why/how they act differently). Instead of making assumptions, I figured I would ask here :-[
Thanks in advance for your patience and understanding