I'm working on moving my breadboard "prototype" to a more permanent setting, aka a box. In order to do so, I soldered my components on a solderable breadboard then connected it to my NodeMCU. When I ran my program, pin D2 on my NodeMCU seems like it wasn't giving out any signal because when I measured the voltage from that pin it was giving out a negative voltage (which I interpreted it as not actually giving out anything..).
When I ran the program on my breadboard "prototype" instead of my permanent setting, pin D2 gave out a signal of around 3 ish voltage. Now granted it's a different NodeMCU.
Do you guys have any idea of what I might be doing wrong? Or is it just that pin not working. I tried pin D1 and D3 too, they didn't work either..
Thank you in advance!