Arduino nano


Somebody knows why the led is only blinking when one side is not touching the breadboard?


Because you haven't soldered the headers into the board. You can not use any components like that.
Put a resistor on that LED.


There is a sort of unwritten rule in electronics.

You actually have to connect things to make them work. :astonished:

OK, if you really, really don't want to solder it, you have to jam a toothpick down each hole to hold the header pin against the side of the hole.

But really - get the equipment and solder it. Basically, you can't "practice" electronics without that facility.

Ok thank you i thought contact is contact....


i thought contact is contact.

It is and it is surprising for a beginner that you do not get contact on all the pins, but as you have found out you don't.