MOSFET LED Strip

Other Hardware LEDs and Multiplexing
1

Hi Arduino Community!

I have created a test circuit where the Arduino PWM is intended to control the fading of an LED strip. At the moment I'm using an N-MOSFET module to switch 12V external power, controlled via PWM using the 'Fade' example script (altered obviously for the use of pin 11).

I appropriated this tutorial as a reference point for my current layout.

Pin 11 is connected to the Gate of the MOSFET, ideally switching the flow on and off to the PWM modulation.
The Drain of the MOSFET is connected to the RGB inputs of the LED strip.
The Source of the MOSFET is connected to the Ground of the 12V power pack (alongside the Ground of the Arduino).

However, while the connection seems to work (in the sense that the lights turn on and expected voltages are being carried to the Gate of the MOSFET to connect the Drain and Source), there doesn't seem to be any PWM response in the lights (i.e. no fading in the LED strip).

If anyone could point me in the right direction I would be incredibly grateful!

Many thanks in advance,
Ryan

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2

That schematic is not correct.

To get help, you must show us your complete sketch.
And good image of your wiring.
Attach your code using the </> icon on the left side of the posting menu.

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3

You need three FETs one for each colour. They need to be wired up so that the FET pulls each of the three RGB LEDs to ground.