Hi, i need help with this Project if someone got any idea how to do this i will be very grateful.
The idea is to use the arduino to control a Solid state relay.
The question is what do i need to put in the ? box to power up the arduino and control the light?
I think that box will be two components. One will be a power supply for the Arduino and the other will be a relay or SSR to switch the light.
And connect one Arduino output pin to the SSR and ground the other SSR pin to the common Arduino ground. Set the pin high to turn on the SSR. Set the pin low to turn off the SSR.
This is all doable if the 230V is AC.
Paul
Hello good afternoon,
Probably i didn't explained very well, the problem is, I don't want to use any power source or external battery, I would like to use the power of the ring to power the arduino and keep it with power even with the light on or off I know there a way to do that, but is not so straightforward.
Thank you.
chicomoura:
Hello good afternoon,Probably i didn't explained very well, the problem is, I don't want to use any power source or external battery, I would like to use the power of the ring to power the arduino and keep it with power even with the light on or off I know there a way to do that, but is not so straightforward.
Thank you.
Bit of a problem, in case 2.
Where are you going to get the current to power the Arduino, if your only source is now short circuit.
Looks like you want to remote control a wall light switch that only has the loop wire connected to it, no neutral.
Tom... 
Hi Tom,
Yes you are right, i know i have to remove the original light switch to be possible extract from there some voltage.
Thank you 
Shoud be something like this, but still missing something.
If someone got any idea how to do this i will be very grateful.
The idea is to do something like this switch... which dont require the neutral wire.
But for now i just want to do some a test board.
LW400-Spec-Sheet.pdf (155 KB)
