HockeyBeard
Well-Known Member
Hmmm, $60 a pop is pretty pricey, I'd almost rather make the investment in 20, and build out that many lights than pay 2x the price per COB.
Option A ) Simple Voltage regulator 10V pwm ,from Arduino .
1x L7810 Voltage Regulator .
1x Electrolytic cap 47uF / 16 V
1x Ceramic cap 100nF
1x 2N3904 transistor
1x 4700 ohm resistor .
......
& 12 VDC power supply
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View attachment 3203119
Don 't forget :
* Connect Ground (-) of the 12 VDC supply with Arduino's ground ,if Arduino is powered by a different
power supply ...Always "Common Ground" between different circuits ......
(In this case : ! Does not apply for the gnd pwm output ! )
*Total cost: probably less than $5 .
+10 VDC out goes to " Dim +" of driver ,likewise GND PWM out goes to " Dim- " of driver ...
With Arduino 's 'pwm library ' and some code lines one can replicate very easily ,with plenty of parameters set , dimming control like " Dawn" ,"Dusk " Noon Peak" , " Cloudy weather / gimme a break for five - " ,etc ...
{ -Set a operational Pwm frequency .Usual range is 100Hz - 1000 Hz.Check led driver's spec sheet for detailed manufacturer's recommendation / guides .
-Dimming is achieved by adjusting the duty cycle of the pwm ....
From 0% up to 100% of duty cycle.
-Of course both manually or automatically dimming ,or both ,
can be programmed with Arduino ...
( Interrupts and manual overide if switch ..blah ,blah ...Manual control also can be done
from using a pot ,to utilising touch sensors ... Or even a touch screen ..!!! )
Thanks SDS, I built it the next day with 4 channels for independent control over colors. It works great, but I did come across a problem. With the Mean Well 3-in-1 dimming function of the HLN series (I think its the same in the HLG) I had to bridge dim+(blue) and dim-(white) with a 1K ohm pull down resistor in parallel with your circuit. I was stuck on it for a bit until I took a voltage meter to them and realized there was 10v running through. I should have figured that out since that's how dimming with just a resistor (or pot) works. Once I did that I could fade from 0-10v (9.88v) PWM very smooth.
I am now looking into your other thread about thermal protection. You my friend are one smart man.
Darkstar is fantastic, their ultra sour & sage n sour are both solid also, all 3 are good yielders with great taste and decent potency. THseeds has some solid shit. Im not a fan of G13 anymore but wanted to try that sour jackTH Seeds Darkstar at 56 days. Amazing smell and excellent buds. Also got thumbs up from the testers.
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Ya for sure could have been better yield. A larger volume of medium per plant could have easily helped. There was going to be 6 females flowering and the two OG s1 x SWT#4 IBL hermied early flower so I pulled them out and finished with 4 so if I had the two other plants they yield would have been higher.Gram a watt on first try, congratulations!
And probably still room for improvement on yield?
No problem, I tried to refrain from posting a ton of pics in here throughout, didnt want to hijack the thread just enough updates to show the effectiveness of the COBs.Nice work BT and thank you for documenting your results it is appreciated!
Did the Kill A Watt testing on them today:Finished up the red and blue LED bars and tested them out. Holy crap are they ever bright. At least twice as bright as I thought they were going to be, I am very impressed.
They are two 24" heatsink bars with a total of 10 Luxeon ES EX6 bin 660nm, 4 Luxeon ES M4R bin 450nm, 4 Cree XP-E P3 bin 630nm powered by a fasttech 650mA driver.
I am not doubting these LEDs should help kick the ladies up a notch this run. Cant even capture it well on camera but took a couple pics anyway.
Hi, thats me. Made a website because ebay has stupid limits.Good find. I wonder....