Why isnt my LED lighting on breadboard? | Smarter Dev | Page 1

agile aspen Apr 25, 2026, 11:16 AM

#

Hey guys, i just got a breadboard and trying to make a LED light.

I got the power supply module in, and have added a resistor of 330ohm from the + rail to 9J.

Then an LED whose short leg is in 9i, and long leg is in 10i. Then a jumper cable going from 10j to the - rail.

However for some reason its not lighting up, have tried 4 LEDs of different color and nothing.

Just wondering if maybe im doing something wrong🤔

stray bisonBOT Apr 25, 2026, 11:16 AM

#

Hi! Thanks for posting, but I notice a couple of issues:

Off-topic: This appears to be a hardware/electronics question rather than a programming question. This forum is for coding help. You might have better luck on an electronics forum like r/electronics or Arduino forums.
Missing details: Your post has no content body. To get help, please provide:
- A photo or diagram of your circuit
- Component specifications (LED type, resistor values, power source)
- What you've already tried
- Any error messages or unexpected behavior

If you have a programming question related to microcontroller code (Arduino, embedded systems, etc.), feel free to repost with your code and the specific issue you're facing!

agile aspen Apr 25, 2026, 11:17 AM

#

Smarter dev telling me to ask reddit

agile aspen Apr 25, 2026, 11:42 AM

#

Oke figure it out guys

#

edgy sentinel Apr 25, 2026, 2:41 PM

#

Does that rail have power? Is your diode in backwards?

agile aspen Apr 25, 2026, 5:27 PM

#

ye the diode was in backwards

#

i thought the longer side was meant to face negative but turns out it should face positive

edgy sentinel Apr 25, 2026, 5:37 PM

#

🤣

agile aspen Apr 25, 2026, 11:09 PM

#

@edgy sentinel these breadboards go well with arduinos right?

#Why isnt my LED lighting on breadboard?