We need a progress report
Dream Chip LEDs with Arduino
- Thread starter giulianom
- Start date
Nothing done yet... still getting my tank up and running, so I put it off for now...
One development that I'm considering is the new Allegro A6211 driver boards..
http://www.reefcentral.com/forums/showthread.php?t=2310459&page=5">http://www.reefcentral.com/forums/showthread.php?t=2310459&page=5</a>
It seems like there was a recent update by O2Surplus, and he may be releasing the design files soon...
If so, I may order a batch of boards...
Check out this post on RC:
http://reefcentral.com/forums/showpost.php?p=22120166&postcount=116">http://reefcentral.com/forums/showpost.php?p=22120166&postcount=116</a>
That guy's amazing - developed a 5-channel PWM dimming driver board for the "Dream Chip" LEDs that's capable of delivering the full amount of current (1400mA) to the chips, rather than the 1A max from the LDD's.
It's set for 1600 mA right now, but that can be changed...
Looks like I may be ordering a batch of these boards, soon as O2Surplus releases the design files.
http://reefcentral.com/forums/showpost.php?p=22120166&postcount=116">http://reefcentral.com/forums/showpost.php?p=22120166&postcount=116</a>
That guy's amazing - developed a 5-channel PWM dimming driver board for the "Dream Chip" LEDs that's capable of delivering the full amount of current (1400mA) to the chips, rather than the 1A max from the LDD's.
It's set for 1600 mA right now, but that can be changed...
Looks like I may be ordering a batch of these boards, soon as O2Surplus releases the design files.
Old thread, new updates:
O2 Surplus over at RC finished a new driver board for the "Dream Chip" LEDs that can actually power all 5 channels at the max 1.4A, for a grand total of 252 Watts per chip...
And I bought four. </em>
alt="" /></a>
These things take 48V DC in, and output into 5 separate channels, each able to be dimmed independently.
They use a new LED driver chip from Allegro, called the A6211, and each is jumper-selectable for 300mA, 700mA, 1000mA, and 1400mA.
What's more, they have a little Arduino chip on the back side of the board, pins for temperature sensors, pins for fan control, as well as a slot for a 48V to 12v/5v regulator to power the Arduino and fan.
Quite a lot of intelligence for a small 100x100mm board.
Now, all I have to do is do the calculations to size a heatsink that can dissipate 252 Watts, with or without a fan...
O2 Surplus over at RC finished a new driver board for the "Dream Chip" LEDs that can actually power all 5 channels at the max 1.4A, for a grand total of 252 Watts per chip...
And I bought four. </em>
These things take 48V DC in, and output into 5 separate channels, each able to be dimmed independently.
They use a new LED driver chip from Allegro, called the A6211, and each is jumper-selectable for 300mA, 700mA, 1000mA, and 1400mA.
What's more, they have a little Arduino chip on the back side of the board, pins for temperature sensors, pins for fan control, as well as a slot for a 48V to 12v/5v regulator to power the Arduino and fan.
Quite a lot of intelligence for a small 100x100mm board.
Now, all I have to do is do the calculations to size a heatsink that can dissipate 252 Watts, with or without a fan...
Probably - each channel could power a single 50W array chip, or one board for one 5-channel Dream Chip.
The boards were about $50 each, and came assembled, though I still need to get a voltage regulator module.
I ordered 4 x 300W 48V power supplies from Aliexpress/Alibaba in China, one for each DreamChip.. They'll be here in a few weeks.
- Messages
- 1,692
- Reaction score
- 53
thats going to be a beast of a heatsink. have you seen the photon cannons by ecoxotic? those are 50 and 100 watt leds and their heatsinks are massive ( they are oval and close to a foot wide and more than a foot long) so yours would have to be even bigger. have you considered liquid cooling? or TEC's to help take some of the load off.
Picoreefguy;963249 wrote: thats going to be a beast of a heatsink. have you seen the photon cannons by ecoxotic? those are 50 and 100 watt leds and their heatsinks are massive ( they are oval and close to a foot wide and more than a foot long) so yours would have to be even bigger. have you considered liquid cooling? or TEC's to help take some of the load off.
alt="" />
Yeah, that's pretty massive.
The chips are pretty similar, multi-array chips.
Some of the heatsinks I'm looking at are about 10" wide with fins about 2.5" tall, and as long as you want:
http://www.heatsinkusa.com/10-080-wide-extruded-aluminum-heatsink/">http://www.heatsinkusa.com/10-080-wide-extruded-aluminum-heatsink/</a>
That price is per [I]inch</em>, so if you figure a 10" wide x 10" long heatsink for 1 LED, ~$65...
But it seems to have enough thermal conductivity to radiate the heat with no fan.
Actually, the more I think about it the more I like the idea of just using the MakersLED heatsinks.
I'd have to drill 4 holes on the side of the LED chips, spaced 20mm vertically apart:
alt="" />
But that should be pretty easy, it's just a metal back plate.
I can mark a line pretty accurately and center-punch it on the spot.
I'd have to drill 4 holes on the side of the LED chips, spaced 20mm vertically apart:
But that should be pretty easy, it's just a metal back plate.
I can mark a line pretty accurately and center-punch it on the spot.
So I received 4 x MakersLED heatsinks today, each 12" long:
alt="" />
alt="" />
alt="" />
The heatsink is a pretty neat design, I have to say... the slots along the bottom edge are for a 2mm thick sheet of acrylic to protect the LEDs.
Came with all the accessories, nuts & bolts, a 92mm fan, end caps... etc.
Should be a pretty nice job.
The heatsink is a pretty neat design, I have to say... the slots along the bottom edge are for a 2mm thick sheet of acrylic to protect the LEDs.
Came with all the accessories, nuts & bolts, a 92mm fan, end caps... etc.
Should be a pretty nice job.
