user14840: I'm an electronics noob. I have this string of LEDs but don't know how to connect them to my Arduino Uno. As they are wired in parallel, there are two wires / four ends. What do I plug where?


user14649: Connect the negative ( or cathode ) to ground ( 0V )
and the postive ( anode ) to the output pin of the controller.
Firstly connecting that many LEDS directly to a single micro pin is not a good idea. Usually you would need to go through a buffer/driver first which can deliver the correct power to the LEDS.
I'm not that familiar with the UNO but unless that board has a driver circuit on it you might need a few extra components.

What are the specs of the LEDS?

14840: <p>I'm an electronics noob. I have this string of LEDs but don't know how to connect them to my Arduino Uno. As they are wired in parallel, there are two wires / four ends. What do I plug where?</p>

<p><a href="https://i.stack.imgur.com/sx9SN.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sx9SN.jpg" alt="string of LEDS"></a></p>
 14649: <p>Connect the negative ( or cathode ) to ground ( 0V )
and the postive ( anode ) to the output pin of the controller.</p>

<p>Firstly connecting that many LEDS directly to a single micro pin is not a good idea. Usually you would need to go through a buffer/driver first which can deliver the correct power to the LEDS.</p>

<p>I'm not that familiar with the UNO but unless that board has a driver circuit on it you might need a few extra components.</p>

<p><a href="https://i.stack.imgur.com/13wme.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/13wme.png" alt="Basic LED driver"></a></p>

<p>What are the specs of the LEDS?</p>
