Controll 0-10V LED Driver with Arduino

Projects General Guidance
1

Hi all

Once again, I am asking for your valuable know-how.

Goal:
Voice-controlled, dimmable LED ceiling lamp. Powered from 230 V house electrics.

Question:
What is the best/safest/most elegant way to power the MCU and to obtain the 10 V PWM

Parts:
Node MCU, Meanwell LCM 25 (LED Driver), 18 W LED Panell, (PSU for MCU and 10 V PWM --> This Question)

Additional Info:

  • The LCM 25 takes 0 to 10 V or 10 V PWM
  • It shouldn't get hot. If there are parts with furniture certification, it would be even better.

Schematic and idea:
I have added a power-point sketch (I am sorry). The red boxes are on the 230 V AC side, the green ones on the DC side. The blue lines represent the PWM signals (of course there would be + and -). The red and black lines are the + and - supply lines. In this schematic, I would propose to use a buck converter (230 AC to 10 DC). I am not sure yet how to do the 3.3 V to 10 V PWM conversion (i.e. with a gain or a mosfet).
Any suggestions to change/complete it are welcome.

If you need any additional information, please let me know.

2

To create a 10 volt PWM I would start with a 10 volt powersupply, a logic MOSFET transistor.
To power the MCU, use a 3.3 volt stepdown converter from the 10 volt.

3

I believe the Mean Well power supply has 10V built-in because it can be dimmed with "resistance".

You can make a transistor or [u]MOSFET driver[/u], and just connect the MOSFET''s drain to the PWM input. The MOSFET doesn't have to handle any current or "power" so any "logic level" N-channel MOSFET will work. (This is an inverting circuit so 0% PWM is 100% brightness, etc.)

4

Thanks a lot for your answers.

@Railroader, would have any recommendations for a reliable 10 V psu?

@DVDdoug Wouldn't there be a short if the mosfet is at 100%

5

It's all up to what supplier You have. Regarding the reply from @DVDdoug I wonder if just the MOSFET would do. You need to dig up more infor about that Mean Well power supply. I bought a little powersupply, that has a range of voltage from 4 to 24 volt, 1.5 amp from Ebay.

6

gian131294:
@DVDdoug Wouldn't there be a short if the mosfet is at 100%

Yes, there would be, and that's fine.
Those dimmers can also be controlled with a (100k) potentiometer.
And that can be 0-100k.

There has been at least two Meanwell dimmer threads last week.
In there are the answers you seek.
Hint: a 10cent opto coupler with one 1k resistor is all you need, and potentially safer than a mosfet.
Leo..

7

Thanks for your answers.

In this case, I only need a psu for the node mcu.
Is it feasible to take a step down converter from 230 to i.e. 5V (3.3V)?

8

Yes.

9

Easiest way to power a NodeMCU is with a 5volt cellphone charger, connected to the USB socket.
Leo..

10

I will have it in a ceiling lamp. Therefore, a cell phone charger isn't that ideal. I will have to connect it directly to wires without a socket.

11

Search for Arduino + ceiling fan! Not long ago another member made stuff for that!