High Power LED 3W with Arduino ?

Other Hardware General Electronics
1

Hey everyone,

I’m trying to make a stroboscope with an Arduino Uno. I was able to make it with small classic LED’s but I’m trying to make it more powerful.

So, I found this modules :

I would like to put 5 of this modules.

But I don’t understand how, and I don’t want to burn the Arduino!

I think I understood that I would need an external power supply because the Arduino can’t power the 700mA (3W) High Power led.

I would like to have full control on each LED with the Arduino. I already have the code.

If I understand correctly :
I have to put this 5 LED in parallel
I have to put an external power supply

I have this

with max output amp : 700mA.

How can I power this ? If I put 5 LED in parallel, will the power module break because of the 700 mA limit ?

Do I need a DC 5V - 2A connected to the breadboard for example, with a female barrel jack only ?

Sorry if it is not clear, newbie here :slight_smile:

Thanks a lot for your help !

2

Also posted in the French section
Please check replies there before responding here.

3

Mey:
So, I found this modules

What's on the back side of that module? Could you provide a link to where you found that led module?

Mey:
How can I power this ? If I put 5 LED in parallel, will the power module break because of the 700 mA limit ?

The power module will give 700mA total for all 5 leds combined. Which means 700mA/5 = 140mA per led. All leds will light up but will be dim.

Mey:
Do I need a DC 5V - 2A connected to the breadboard for example, with a female barrel jack only ?

NO, you will need a power supply with at least 3.5A output capability if you want the leds to light up at full brightness.

4

Thanks a lot Noobian for your answers.

Yes, the LED module was initially found here: https://www.aliexpress.com/item/High-Quality-3W-LED-Module-High-Power-Module-For-Arduino/32820041832.html?spm=2114.search0305.4.4.0Lch47

"The power module will give 700mA total for all 5 leds combined. Which means 700mA/5 = 140mA per led. All leds will light up but will be dim."

Oh! Ok! That makes sense now!

"NO, you will need a power supply with at least 3.5A output capability if you want the leds to light up at full brightness."

Ok, noted! Thanks again !

5

Once you have your 3.5+ amp power supply sorted, you could use a MOSFET to switch the LEDs on/off.

Connect all LED anodes to the +ve power rail, and all cathodes to the MOSFET source pin. Connect the MOSFET drain pin to GND, and the Arduino output pin (with a pull-down resistor to GND) to the MOSFET gate pin.

You will need to choose a suitable MOSFET, one which switches on logic levels. Look for "L" at the end of the part number.

6

Hi,
Those modules : http://yourduino.com/sunshop//index.php?l=product_detail&p=458

Have built-in driver transistors.

They draw about 0.6 amps (600mA) each, so you need .6 * as many units as you have.

HERE is a strobe example that works well: SimpleStrobe - ArduinoInfo (Nice with a Fidget Spinner!).

A Yourduino RoboRED (LINK) provides 2A at 5V so you can run 3 of these with no external power supply (If you run the RoboRED on 9-12V at 2A).

DISCLAIMER: Mentioned stuff from my own shop...

7

AdeV:
Once you have your 3.5+ amp power supply sorted, you could use a MOSFET to switch the LEDs on/off.

Connect all LED anodes to the +ve power rail, and all cathodes to the MOSFET source pin. Connect the MOSFET drain pin to GND, and the Arduino output pin (with a pull-down resistor to GND) to the MOSFET gate pin.

You will need to choose a suitable MOSFET, one which switches on logic levels. Look for "L" at the end of the part number.

Not needed, that module can be controlled directly with the ttl logic output, just like "terryking228" said.

@Mey - this is how your setup will be like

1000×488 152 KB

8

Thanks a lot for your answers !! This is very helpful. Let's get to work ! :slight_smile: