Voltage of LED strip

Other Hardware LEDs and Multiplexing
1

Hi! I have a LED strip that I ordered a long time back and i don't remember the voltage of that strip. I have attached the pictures of the LED strip below. Can someone please help me to find the exact voltage of that LED strip?
Thanks

20220626_123412
20220626_1234121920×2560 310 KB

20220626_123405
20220626_1234051920×2560 183 KB

20220626_123258
20220626_1232581920×2560 122 KB

20220626_123242
20220626_1232421920×3541 328 KB

2

Your topic was moved to its current location as it is more suitable.

Could you also take a few moments to Learn How To Use The Forum.

It will help you get the best out of the forum in the future.

Thank you

3

Try connecting it to 5V, if it lights then it's 5V, if it doesn't then it's probably 12V.

4

So you mean i should connect the positive wire to 5V and the negative to GND and then see if it works? And do I have to run a code to check it or no?

5

Yes, exactly that. Why would you need any code?

Pedantic point: It's not ground, it's the negative pole of the power supply.

1 Like
6

This appears to be single color LED strip, 1 current limiting resistor and 3 LED's in series. I suspect a 12v strip, (3 LED's in series drops the voltage down about 4.5v already) but if you can tell me what the value is of the current limiting resistor i can be fairly sure. You can use a multimeter to measure it, and by what is written on it.

7

"151" - 150 Ohms according to the image above.

Selection_076
Selection_076246×691 106 KB

20 mA if the LEDs drop 3 V each.
:face_with_raised_eyebrow:

8

3v Each might be a bit much. (i couldn't tell from the image what the resistance was) but i guess to start with 9v, and measure the voltage drop to confirm.

9

3 V is pretty standard for a white LED, and that's why I gave you the zoomed view. :grin:

1 Like
10

Hi,
by the appearance the LED of the strip is the SMD5730.
It is for 3V and supports a maximum current of 150 mA.
But the 150 Ohm resistor, limits the current (if used at 12V) in
80mA, (12/150 = 0.080).
If we consider that each LED is for 3V, we will have 12V - (3V * 3) = 3V.
3V/120OHms = 0.020A = 20mA.
3V/150OHms = 0.020A = 20mA.
Each segment of 3 LEDs will consume 20 mA.

Below are some of the LEDs that are commonly used in LED Strip Lights.
DIFFERENCE AMONG SMD2835, SMD3528, SMD5050, SMD5630, SMD5730.pdf (292.0 KB)

11

As per #7, except that it is 150 Ohms in the calculation, not 120. :grin:

12

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.