Hello~
I wonder which type of Arduino product is suitable for driving 90 700mA LEDs with different duration from several seconds to continuity, different frequency and pulse duration, and adjustable output strength. These 90 LEDs are supposed to turn on/off simultaneously. Is "Arduino Uno" ok for these purpose?
Thanks!
Maxwell
Do you have a 63A power supply?
I will request our facility to build the power supply. Does '63A' mean 63 amp?
PaulS:
Do you have a 63A power supply?
Does '63A' mean 63 amp?
Yes. I take it you have no electronics experience ? Please give us a more detailed project objective. I understand you to mean EACH led is rated for 700mA , correct ? Do you have any electrical or wiring experience at all ?
Thanks!
In short, I want to build a device/system to shed light on animals for optogenetic experiment, or to trigger light-sensitive channels. And yes, each LED is rated for 700mA. I bought from here: Red (627nm), CoolBase Square LED - 106lm
Total 90 LEDs in my system. I am going to use this system to shed light on animals with options that
I don't have any electrical or wiring experience at all. But the facility in my lab will help me do that.
I really appreciate your help!
Mx
raschemmel:
Does '63A' mean 63 amp?
Yes. I take it you have no electronics experience ? Please give us a more detailed project objective. I understand you to mean EACH led is rated for 700mA , correct ? Do you have any electrical or wiring experience at all ?
For 700mA, you need a constant current driver for each LED:
We recommend that this LED not be powered at more than 700mA unless special precautions are taken to ensure that the LED is properly cooled at higher driver currents. We offer a complete selection of current regulating drivers.
http://www.luxeonstar.com/700mA-Low-Voltage-LED-Drivers-s/53.htm
Why so much Red light?
The animals are part of a government project to train an all animal Special Forces Team . The red lights are for night ops...
CrossRoads:
For 700mA, you need a constant current driver for each LED:We recommend that this LED not be powered at more than 700mA unless special precautions are taken to ensure that the LED is properly cooled at higher driver currents. We offer a complete selection of current regulating drivers.
Why so much Red light?
Could you talk more about the "current driver"? Can I just use one driver for every LED since they are supposed to be turned on or off at the same time?
I want to shed light on ~400 fruit flies simultaneously. I hope the light strength is high enough to trigger the light-sensitive channels deep inside the fly brain.
I would recommend adding a power management H/W & S/W module that monitors the current through sensors and possibly the temp of the devices and displays the info and has error checking to shutdown units independently if there is a problem.
You can have fans turn on if the devices get too hot and have it automatic.
raschemmel:
You can have fans turn on if the devices get too hot and have it automatic.
Oops~ How hot could it be under the illumination of 90 627nm LEDs of 700mA? If it would be very hot I think I should reduce the number first.
Hot where ? Are you worried about cooking the flies or the leds ?
raschemmel:
Hot where ? Are you worried about cooking the flies or the leds ?
We will build cooling system for LEDs. I am worried about cooking the flies, although we have designed a height-adjustable apparatus.
By the way, can I buy "Arduino Uno" for my purpose?
The LEDs will all be turned on & off together? Yes, an Uno would be fine.
Could you talk more about the "current driver"?
Follow the current driver link, I copied it, from the LED page you referenced.
It has more info about the different drivers.
Personally, I think that LED is total overkill for this. Do you really need 700mA x 5V = 3.5W of power for a fruit fly?
I would think a regular RED LED powered with 20mA would be sufficient.
http://www.superbrightleds.com/cat/component-leds/filter/Color,Red,136,4639:LED_Package,5mm,18,167:
Can connect up to 96 LEDs to this board, need a current limit resistor per LED:
(5V - 2.3V Vf)/.02 = 135 ohm
http://www.crossroadsfencing.com/BobuinoRev17/
Maybe mount the LEDs in globe or cylinder around the flies.
CrossRoads:
Maybe mount the LEDs in globe or cylinder around the flies.
We plan to mount the LEDs in top and bottom layers.
Many Thanks for your info!
Oops~~
I think I was too crazy to trigger 90 700mA LEDs at the same time. Thanks to some people's help, I would like to set up a system of 16 LEDs, instead of 90, now.
Thanks for everyone's help!
I think I was too crazy to trigger 90 700mA LEDs at the same time
Why ? Have you regained your sanity ?
raschemmel:
I think I was too crazy to trigger 90 700mA LEDs at the same time
Why ? Have you regained your sanity ?
Or I started to gain my sanity for electronics. 
I was told that the 63A is a crazy number.
Yeah, it's a little high!
