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

[Andrew Sands]

Guys,

Anyway to get in on this as a discussion. I may not be able to bring
much to the table but I can 'break' things?
regards,

Andrew


On Wed, Jan 17, 2018, at 20:06, Rob de Voer wrote:
> Hello Mike,


>  


> Yes, a design based on Mosfets seems to be best way to go.


>  


> How do you use the RGB strips? Still on your workbench or installed in
> your house?>  


> Have some step down regulators to convert the 12v to 3.3or 5v and
> can also bring ESP32, Arduino and WemosD1 R2 as alternatives to
> drive the gate.>  


> Would be great to get together and sort this out.


>  


> I have no relevant experience with any PCB design work (am a
> mechanical engineer with 30+ years of software development
> experience), played around in Fritzing to create my designs but never
> turned any of those into PCBs.>  


> The couple of boards I made consist of soldered tracks on test boards…>  


> Will email my contact details offline to arrange getting together.


>  


> Kind Regards,
> Rob

>  


> *From:* Mike Field [mailto:hamster at snap.net.nz] *Sent:* 17 January
> 2018 22:38 *To:* Rob de Voer <rob at businesspalz.com> *Subject:* Re:
> [chbot] In need of dimmer board to control 12v LED via Arduino>  


> 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, 6(?) channels (3 dual MOSFETS), screw terminals and so on. We
> could even add a 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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