Dimming HLG and LPF drivers with Arduino

[ryan115]

My DIY fixture has been running well using 1 HLG driver and 2 LPF drivers.
I am currently using some 100k potentiometers for dimming purposes.
I am wanting to build an arduino LED controller and have been reading through everything I can find.
The best options I have found for the three dimming option are below.

1.) 100k Potentiometer
Without running a stepper motor to turn a mechanical pot, I found this little guy
http://www.analog.com/static/imported-files/data_sheets/AD5290.pdf
I am not exactly sure how to wire and control this, but likely something similar to this http://www.arduino.cc/en/Tutorial/SPIEEPROM
There didn't seem to be too many digital pots that could handle a high enough voltage, which i need because the HLG puts out 10V on the dimmer circuit correct?

2.) Analog 1-10V
It seems running a separate power supply and running the dimming through an Op-amp with the arduino controlling it though PWM seems to be the most common method. Are there any downsides to going this route?
I found this multi-output Op-amp (model TLV2374IN) that I think should allow me to control all 3 drivers separatly through one IC.
http://www.ti.com/lit/ds/symlink/tlv2370.pdf
Here is what I came up with for wiring this chip. Please review and let me know if this should work

Also am I correct that it would be better to use a 10V power-supply instead of a more common 12V, because bad things happen if you put more than 11V on the dimming circuit?

3.) 1-10V PWM
I looked and saw a few ideas but, nothing really seemed to have great/reliable results implementing this method.


Please let me know what you think the best/easiest/most reliable method would be, and if I am off on what I am thinking.
Thanks

 

[mcgyvr]

#3 is easiest..
Just PWM a transistor with a 10V power supply

a google image search for "arduino 10v pwm" will yield TONS of results/schematics/topics..

 

[oreo57]

Well I'll be.. Somebody is selling them........you need 1 per PWM out and a 24V ps..(15-35 but most common)
http://www.dx.com/p/jtron-pwm-turn-...e-conversion-module-green-267033#.U0aQeWdnB8E

 

[ryan115]

I did search for that, but it seemed like several threads started off with that design and then ended up with the opamp. Also i thought i read something about the hlg drivers being a little different and not working with a transistor.
Thanks for the recommendation, i will look into it a little further

 

[mcgyvr]

HLG and LPF both have the same 3 in 1 dimming.. the circuit would be the same..

 

[ryan115]

Looking at that board it looks like it still just converts the PWM to an analog 1-10V, correct?
This is the main thread I was reading where the transistor wasnt really working with these drivers and they ended up going with an opamp
http://www.reefcentral.com/forums/showthread.php?t=2128042

If it works though, is this basically what you are thinking? And what would be the best transistor to use, NPN or PNP? also do you know if it does work just connected across the dimming wires without the external power as they say it might?
https://forum.allaboutcircuits.com/showthread.php?t=69870
Thanks.