[chbot] In need of dimmer board to control 12v LED via Arduino

[Mike Field]

Hi Rob,

I am switching 25W 12V RGB strips using Si4944DY 30V Dual MOSFETS from 
Jaycar - datasheet is at https://www.vishay.com/docs/72512/72512.pdf 
They are tiny SOIC8 packages, and can switch about 10A (!)

'On' resistance is less than 0.02 Ohm, These are old parts, the 
replacement Si4946 are rated at 60V. I've got 10 of these on their way 
from my mate Ali E in China for $1 each :-)

I've got a couple mounted on DIP adapters, on a breadboard with an ESP32 
driving the gate through a current limiting resistor. You are more than 
welcome pop over and either experiment with them - I can hook your load 
up to a PSU and a function generator driving the gate), or take one away 
to play with.

I'm also happy to work with you on a board, with headers for the ESP 
module, 4 or 6 channels (2 or 3  x dual MOSFETS), screw terminals and so 
on. We could even add a 1A 5V0 or 3V3 regulator to power whatever is 
controlling the lights. I'll got all the bits here or almost here, just 
not enough motivation to move it off the breadboard to  a PCB. - fancy a 
Saturday afternoon / evening project session?

Are you better at KiCad or Eagle than me?

Mike.


On 17/01/2018 10:02 PM, Rob de Voer wrote:
>
> Hi All,
>
> I have been gradually replacing the 240v lighting in my house with 12v 
> LED lights all powered by one 12v transformer and switched through a 
> home automation system made up of several Arduino boards and one 
> RaspBerryPI3.
>
> I want to start installing higher powered LEDs (21w 12v or more), dim 
> them to the low output for daily needs, and adjust the dimmer as needed.
>
> Unfortunately building a suitable dimmer module so I can control 
> individual LED lights has thus far proven outside of my ability.
>
> Have tried some of the published designs but have to resign myself to 
> the fact that I should stick to building software since i appear 
> unable to convert any of the myriad of example project to my needs.
>
> Who is able to help me build a 12v dimmer board that can be controlled 
> remotely using any of  Arduino / ESP8266 / WemosD1R2?
>
> Do I need to limit myself to a specific power (i.e. 21w LED) for the 
> dimmer to work efficiently or is a good design not that restrictive?
>
> Kind Regards,
>
> Rob
>
>
>
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