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Please help an absolute beginners with LEDs

Discussion in 'LEDs and Optoelectronics' started by majapi69, Sep 29, 2021.

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  1. majapi69


    Sep 29, 2021
    As an absolute beginner with electronics, I'm looking for a little help.

    If I cut the strip and connect to the ground pad and the other lead to R, G or B pad, I will get Red, Green or Blue respectively to light up?

    Please help a total newbie.

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Your power supply needs to match the strip, usually the strip is 12 V.
    Connect '-' of the power supply to GND.
    Connect '+' of the power supply to any of R, G or B or a combination thereof and the corresponding LEDs will light up.

    Corrected as per @bertus' excellent labeling of your photo:
    Connect '+' of the power supply to +5V.
    Connect '-' of the power supply to any of R, G or B or a combination thereof and the corresponding LEDs will light up.
    No other circuitry is required (current limiting is done on the strip by series resistors, no need to care about these).
    Last edited: Sep 30, 2021
    Howard A Read likes this.
  3. majapi69


    Sep 29, 2021
    In this case it's 5v but thank you for confirming my thoughts. As I said, first timer with electronics.
  4. Nanren888


    Nov 8, 2015
    Can you give us the description, or a supplier and part number for the led strip.
    It appears to have only +5, R, G, B without the usual ground connection.
    Is there a GND connection on the back of the strip?
    If not, it may be that the R, G, and or B need to be connected to ground (supply negative) to make those LEDs light.
    I have not personally used this sort of strip.
    Is it described as "common anode" anywhere?
  5. bertus

    bertus Moderator

    Nov 8, 2019

    As @Nanren888 said, the leds have a common + 5 Volts:
    RGB ledstrip comments.jpg
  6. majapi69


    Sep 29, 2021
    Thank you all for your responses. I apologise for my misuse of ground when I mean power.
  7. Howard A Read

    Howard A Read

    Jul 22, 2021
    It was good information. I have an idea for my office setup that is presently in progress and needed to design an LED sign that would be wall-mounted. I like to program simple messages into it. What all would I need for this? I'm personally looking at the pixelpusher. I am familiar with circuit schematics but new to electronics interface programs. Anyway, I will take a try if it is not succeded I may reach one of my friend's sign making company. I'm doing this project mainly to learn about this. Your help and suggestions are needed.

    Moderators note : Again removed hidden spam link, next time you'll be banned.
    Last edited by a moderator: Oct 14, 2021
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