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Topic: Aquarium LEDS controlled with Brushless ESC From RC (Read 1 time) previous topic - next topic

gc9n

Hello all..

I am planning to make a led light control unit with an arduino mega + ethernet shield

i will use  a
1)36V 9.7A 350W AC/DC Switching Power Supply
2)Led panel with 5 Rows of 10 leds , each row draws 700mha

this is my first attempt with an arduino and want your help about this!
i have to find a way to "give" to each row 700mha and Also dimm the lights with PWM. Can i use an ESC(electronic speed controller) to work like a driver for the leds?
i want to use 5 of those ESCs to control all channels seperatly. i will program Arduino to make the lights open in dawn effect and before closing dusk effect.

First of all does anybody drove led lights with an ESC?  second is there any other way to do it? , i want to use ESC because because i have a lot of spares


Riva

I think you need a constant current driver for power LED's like your using. Not sure if an ESC or stepper driver will work. You could buy constant current drivers on places like ebay or build your own http://arduino.cc/forum/index.php/topic,134827.0.html like I did for a 10W RGB LED

gc9n


I think you need a constant current driver for power LED's like your using. Not sure if an ESC or stepper driver will work. You could buy constant current drivers on places like ebay or build your own http://arduino.cc/forum/index.php/topic,134827.0.html like I did for a 10W RGB LED


Thanks Riva for your reply..

I didnt mention the LED i am trying to turn on is this


here is some specifications
DC forward voltage: DC 33V-36V
DC forward current: 1750mA max
Rated power: 63W max

Headroom

The spec sheet is only for a single of the chips on this mosnter. No dimensions etc.
Given the color temperatuerr this LED is very BLUE or so it seems. Not sure how you want to simulate dusk/dawn with it.

Usual daylight conditions are a mixture of direct sunlight around 5000K and blue sky background 15000 - 20000K+.
A color temperature as this LED has with 20 X 20000K and 30x royal blue is going to appear VERY cold blue and not like natural sunny daylight whatsoever. More like an extremely bright icy cold moon  night!

60W  How are you going to heatsink this monster beause this will require serious, perhaps even active (Fan) heatsinking. Also this is rather a point lightsource and a more distributed area light source employing several smaller LEDs may be more appropriate for this case. There are several threads on this forums in respect to Aquarium lighting and I've seem it mentioned at LEDsupply.com.

I don't think that you can drive this unit with a ESC. This likely requires a purpose build constant current switched power supply, which is what most hight efficiency LED drivers are, otherwise not only the LED will need heat sinking but the LED driver as well.

Chagrin

Using an ESC or motor driver is an unstable method with no failsafe; as soon as you teeter a little bit over the current limit of the LED you'll blow the LED. Just don't do it.

gc9n

#6
Jan 09, 2013, 10:27 pm Last Edit: Jan 09, 2013, 10:38 pm by gc9n Reason: 1
i already operating it with a driver that i can dimm it with a potentiometer.
Believe there are bigger leds out there.  http://www.reefcentral.com/forums/showthread.php?t=2128756

So ok the idea to operate the led with an ESC is out! i have to find another way. ill try meanwell power suply that is capable to PWM

Zapro

No. A brushless ESC makes 3 phases with AC voltage, and it won't even run without sensing any back-EMF. you cannot use that.

I brushed ESC on the other hand could be used, but i would NOT recommend it!!!

// Per.

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