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Author Topic: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS  (Read 755495 times)

0 Members and 8 Guests are viewing this topic.

Offline TheDOdblG

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #900 on: February 19, 2013, 05:42:54 PM »
Hi Jamie,

i would like to know is it possible to pwm via i2c. 
i want to build this driver https://github.com/TeraHz/I2C-LED-Driver.

TIA,
ali

I assume you are asking in regards to the Jarduino dimming via I2C.  Changes to the code would have to be made, but I'm sure it's possible.

Offline tangtastic

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #901 on: February 19, 2013, 07:47:29 PM »
How is it possible to overload a led driver, a driver which regulates current and stops current going over x amount, so if a led of 3000ma is used and its been ran at 1500ma is this classed as overloading ?
Enjoy your stay on Ukreefs, please don't hesitate to contact the team if you have any recommendations

Offline bhazard451

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #902 on: February 19, 2013, 07:57:52 PM »
How is it possible to overload a led driver, a driver which regulates current and stops current going over x amount, so if a led of 3000ma is used and its been ran at 1500ma is this classed as overloading ?

If the led driver puts out 3000ma constant, putting 1500ma max leds on it would overheat them and blow them up basically. Splitting the driver into a parallel connection would turn it into 1500ma strings, and it would be ok... unless that connection were to break somehow without fuse protection and send 3000ma through the leds. I dislike parallel for this reason.

Offline tangtastic

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #903 on: February 19, 2013, 08:32:18 PM »
no other way round, led max 3000ma and been driven at 1500ma
Enjoy your stay on Ukreefs, please don't hesitate to contact the team if you have any recommendations

Offline TheDOdblG

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #904 on: February 19, 2013, 08:48:19 PM »
no other way round, led max 3000ma and been driven at 1500ma

They indeed are constant current drivers, but they are rated at specific voltage ranges. If you connect a LED load of 15V on a driver rated at 10V max for example, it either won't work, or if it perchance does it will significantly shorten the driver's life.  Stay within the published ranges and you should be good to go for a long long time...

Offline tangtastic

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #905 on: February 19, 2013, 10:13:48 PM »
cool so my led driver been 35v max and supplying it with 34v and the led been 32Vdc ~36v is ok
Enjoy your stay on Ukreefs, please don't hesitate to contact the team if you have any recommendations

Offline TheDOdblG

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #906 on: February 19, 2013, 11:58:04 PM »
cool so my led driver been 35v max and supplying it with 34v and the led been 32Vdc ~36v is ok

The thing is, LED drivers aren't 100% efficient.  I think RECOMs are around 85-90% efficient, so you need to find out the efficiency of your drivers and consider that as well.  So back to your setup, if you are only supplying 34V, and let's say your drivers are 90% efficient, then the driver is only outputting approximately 30.6V (34*0.9).  You should not place a load on that driver greater than that, so to answer your question, 32-36 is 2 Crees too many.

I supplied some links to some very good and brief "educational" stuff written by Mark Chester on LEDs at the beginning of this thread, but I believe the links may be dead.  Here's some updated links.  I highly recommend reading and understanding the info.  While some of the information is written explicitly for Power LED shields, those use RECOM LED drivers, and therefore any info that you can glean from it can easily be applied toward your very own proper LED setups with the LED drivers of your choice.

Article #1: LED PLANNING AND DESIGN

Article #2: LED AQUARIUM LIGHTING
« Last Edit: February 20, 2013, 02:29:10 PM by TheDOdblG »

Offline bigguy

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #907 on: February 20, 2013, 01:32:01 PM »
 :You_Rock_Emoticon: Many Thanks Just having a read :)
Cube LED Build The Journey :)
http://ukreefs.com/index.php?topic=975.msg8156#msg8156
Large Fat And Dam ugly But Happy to Try and help if i Can :)
Enjoy Your Stay Here.

50cm Cube Tank Thread
http://ukreefs.com/index.php?topic=1005.0

Offline opentoideas

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #908 on: February 20, 2013, 01:54:00 PM »
finally have mine all up and running after a bit of a driver nightmare - blew all of my first 2 sets taking out an Arduino in the process  :41:

changed the type of driver and all now seems well

big thanks to Jamie  :bravo_2:

and everyone else whos threads I have been reading and re-reading.

last problem i found was with my temperature sensors dropping in and out but finally found that if running in parasitic power mode you need to short the 5v and ground leads on the sensor which i had missed and its all working  ;D

only other thing i want to do is set up timer control for some relays but i think that will wait for a couple of weeks to give me a chance to recover a bit but i dont see much of a problem as the code is really well commented and documented so i was able to work my way through colour changes ok.

once again big thanks to Jamie for all of his hard work in writing this and giving us this great tool to work with  :c017:



Offline braecottage

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #909 on: February 20, 2013, 02:43:38 PM »
last problem i found was with my temperature sensors dropping in and out but finally found that if running in parasitic power mode you need to short the 5v and ground leads on the sensor which i had missed and its all working  ;D
Sounds great well done.  Can you elaborate on your temp sensor issue and your fix?  Sounds very like my problem and I haven't sorted it yet despite new sensors and wiring!

Offline opentoideas

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #910 on: February 20, 2013, 03:03:18 PM »
last problem i found was with my temperature sensors dropping in and out but finally found that if running in parasitic power mode you need to short the 5v and ground leads on the sensor which i had missed and its all working  ;D
Sounds great well done.  Can you elaborate on your temp sensor issue and your fix?  Sounds very like my problem and I haven't sorted it yet despite new sensors and wiring!

the DS1820 comes in 2 variants. the "normal" one has 3 pins ground, data and 5v and there is a 2 pin which is just ground and data and it pulls the power from the data line.

you can run the 3 pin in parasitic power mode and only use 2 wires which i needed as i didn't have enough spare cores in the serial cable i used to connect my light unit but what i missed when i read the data sheet is

"Optional VDD. VDD must be grounded for operation in parasite power mode."

if you only connect the data and ground  and do not ground the Vdd pin then what i found was the temperature on the Jarduino would work and read error intermittently and i could not find any reason or fault.

when i tried the "tester" program (the one used to find the sensor addresses) i found that most of the time i had a temperature reading of 85C

grounding the Vdd solved this and no more error readings.

one of the other things i did come across is that these sensors are extremely sensitive to reverse connection and the symptoms are similar.

also incorrect pull up resistors cause similar problems so it could be a number of issues but if you are running parasitic mode then this is likely :)

the tester program is your friend here as if you have it connected with all 3 wires and the tester code shows it running in parasitic mode then it is likely to be faulty. (probable reverse connection)

also you can test the sensor by holding it and watching the temperature rise

hope this helps

Offline bhazard451

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #911 on: February 20, 2013, 07:18:06 PM »
I forget if I asked this before. How much power does the Jarduino draw with only the lcd PWM pins connected (no temp sensors or anything else hooked up). Would it be under 1A?

I'm trying to keep things on one power supply. With Meanwell ldd drivers and 120+ leds installed, I'm already drawing 7.3 A from a 500w 48v 10A PS. Figure 88% efficiency from the PS, I'll need to keep fans and the Jarduino via step downs under 8.8A.

Offline opentoideas

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #912 on: February 20, 2013, 10:29:33 PM »
I forget if I asked this before. How much power does the Jarduino draw with only the lcd PWM pins connected (no temp sensors or anything else hooked up). Would it be under 1A?

I'm trying to keep things on one power supply. With Meanwell ldd drivers and 120+ leds installed, I'm already drawing 7.3 A from a 500w 48v 10A PS. Figure 88% efficiency from the PS, I'll need to keep fans and the Jarduino via step downs under 8.8A.

not sure if you might be worrying about nothing...

your PSU  should be good for the rated 10A (though some overhead is good) the 88% efficiency just means that to output 500W it will be consuming 570W at the wall.

FWIW just measured mine and its about 150mA

Dave

Offline bhazard451

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #913 on: February 20, 2013, 10:38:56 PM »
Ah, nice. I thought it drew much more than that. Thanks.

Offline opentoideas

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Re: 44 Gallon Pentagon Corner Tank LED Hood - DIY Build + EXTRAS
« Reply #914 on: February 20, 2013, 10:45:10 PM »
Ah, nice. I thought it drew much more than that. Thanks.

its not much but i think you need to be careful about under powering it as a voltage drop would make it unstable which is why the suggestion of 2A  to be sure the PSU has plenty of legroom.

glad to help