Hello everybody!
i know the basic of electronic and arduino (I think at least!) for some little projects
now i'd like to control the light of my aquarium via Arduino (nano specifically)
i'm using a meanwell driver to control the leds, it's datasheet says it accept dimming function in 3 way:
0-10v direct
0-10v pwm
or a 100k ohm pot (This is what i'm using right now)
reading in this forum like this 0-10V PWM (2 Solution) - General Electronics - Arduino Forum
or this PWM dimming of a Meanwell HLG led driver - Project Guidance - Arduino Forum
it says that with just a optocoupler i can have a full 0-10V pwm
and this is where i dont understand. Why?
An optocoupler for me it's like only a "relay" it can turn on or passes information when the little led inside turn on, right?
Why shoult it trasform a 5v pwm into a 10v pwm?
i only thought and optocoupler could help isolating the tiny and fragile arduino even more if i wire it (optocoupler) before the relay that turn on and off the meanwell driver..
So i should wire and optocoupler before the relay and another one to manipulate the pwm???
I really dont know where i am lost in here
thank you all!
Just to give a bit more information: i'm powering the arduino from a 12v power supply with a step down module to around 7.5V (Because i also have some 12v fans for the led heatsink) and also powering the relay module with another step down to 5v