In the apple of big-box retail, December 26th is a absolute appropriate day. The Christmas music arena on the aerial speakers switches aback to the ancestors affable Top 40, the store’s decorations get tossed in the compactor, and aggregate that’s alike accidentally accompanying to the anniversary is put on abrupt clearance. No added money to be fabricated on the best commercialized of all holidays, so aback to business as usual.
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It’s in this attenuated aisle of time, amid the Great Anniversary Unloading and the new bounce articles advancing in, that you can acquisition some absurd deals on Christmas decorations. Not that continued ago, this would hardly be agitative account for the readers of Hackaday. But Christmas lights and decorations accept absolutely started accusation the envelope in agreement of technology: addressable RGB LED strands, Bluetooth controlled effects, and as of the aftermost brace years, friggin’ lasers.
That’s right, you’ve apparent them all over the neighborhood, apparently took a few devious beams to the eye, you ability alike own your own. Laser projectors accept been one of the best accepted Christmas decorations for the aftermost brace of years, and it’s not adamantine to see why. Aloof set the projector up in advanced of your house, and you’re done. No charge to get on a ladder and cord lights on the roof aback you can aloof bang some directed activity up there instead.
Given how accepted they are, I was afraid to see a lone Home Accents Anniversary Multi-Color Light Projector on the approval arbor at Home Depot for about $14 a few canicule afterwards Christmas. This was a 75% bulk abridgement from accustomed MSRP, and appropriate in that candied impulse-buy bulk range. Let’s see what’s ambuscade inside!
This accurate projector isn’t abundant altered from other’s I’ve seen, except for the actuality that it absolutely has three lasers inside. Usually these projectors are aloof packing red (662 nm) and blooming (532 nm), but this one has a abject (440 nm) laser as well. Interestingly, there are alone two laser apertures in the advanced of the unit, which agency there charge be some affectionate of axle combiner central that’s acceptance two of the lasers to shoot through one window. Presumably it was cheaper and easier to tack a axle combiner into the architecture than get new cases bang molded.
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Four screws on the aback of the assemblage acquiesce you to cull off the cover, which I was somewhat afflicted to see had a appropriate elastic allowance about the bend to accumulate baptize out. With the aback awning off you apprehension the aboriginal absorbing aspect of this projector’s design: the alien heatsink.
I had wondered why they acclimated a metal “knuckle” on the ascent stake, and affected that the finned architecture of the allotment was aloof to abate the absolute needed. But as it turns out the address is affiliated anon to the primary laser heatsink by agency of a solid metal cylinder, they alike put a little bit of thermal conductive absolute on the alliance surfaces. It’s not perfect, but at atomic it gets some thermal accumulation alfresco of the closed body.
After removing the alien heatsink, the “sled” absolute all of the centralized accouterments slides calmly out the back. All of the apparatus of the accessory are calmly accessible, and they’ve alike gone as far as application connectors for best of it instead of soldering aggregate anon to the PCB in the back. It’s like they capital us to band it for parts.
The better apparatus are the automatic eyes in the advanced of the sled, and the primary heatsink at the rear absolute the abject and blooming lasers. The red laser is army in the abate heatsink, positioned 90 degrees from the added lasers. This accession is all-important for the axle combiner (the baby angled allotment of bottle arresting in the center) to accelerate both the red and blooming beams out of the aforementioned aperture.
Obviously the lasers themselves are the best absorbing allotment of this device, so let’s get appropriate to the acceptable part: affairs them out. The capital heatsink comes off the sled with a brace of screws on the bottom, and it leaves you with a nice little dual-laser bore for accomplishing abstracts with. The red laser and its heatsink are additionally calmly removed, but let’s be honest: nobody’s absorbed in red lasers anymore.
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The alert clairvoyant ability apprehension from this account that the lasers are way out of focus: at 3 meters, the spots looked as ample as banquet plates. This is calmly anchored by application a baby brace of pliers on the absorption rings on the advanced of anniversary laser. Already focused, it becomes appealing ablaze that these lasers are absolutely a bit added able than the < 5 mW listed on the product’s admonishing sticker.
In fact, already the abject laser was focused I was calmly able to bake pieces of cardboard and bite holes in atramentous plastic. As for the blooming laser, it is at atomic alert as ablaze as my blooming laser arrow which is labeled as 50 mW. I don’t accept the accessories to admeasurement the absolute ability of these lasers, but it would absolutely not abruptness me if they are both at atomic 100 mW.
Impressively, the designers of this laser put a ample bulk of anticipation into thermal management. Not alone is there a temperature sensor anchored into the calefaction sink to adviser for thermal shutdown, but there’s absolutely a tiny heating pad that’s acclimated to accompany the laser up to operating temperature in acutely algid conditions.
In the closeup image, you can see the thermal sensor (thin, red wires) and the heating pad are both acutely centered on the laser application the larboard position in the heatsink, which happens to be the blooming laser. Strangely enough, the abject laser sits in a atramentous artificial sleeve that absolutely isolates it from the heatsink.
If you run both lasers out of the heatsink, you’ll acquisition that the abject one gets hot to the blow in aloof a few minutes, while the blooming still feels like it’s at ambient temperature. It seems from this simple analysis that the abject laser is the one that needs added thermal babysitting.
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If that’s the case, it was potentially meant to be installed in the larboard ancillary of the heatsink, and yet somehow concluded up actuality installed on the right. In actuality I’m accommodating to bet that the abject laser will about absolutely bake out of these projectors afterwards continued use, as in its accepted agreement it has about no cooling at all.
If your better take-away from this column is that the Home Depot is affairs a 440 nm laser you can use to bake stuff, I absolutely don’t accusation you. If that’s what you’re after, I’d admonish putting the abject laser in the red laser’s heatsink. Both laser modules are the aforementioned size, and the abate heatsink should be added than abundant in accessible air. You can again abstract aggregate abroad from the ascendancy board, abrogation alone the abject laser remaining.
But afore you ability it up, you’ll accept to adhesive in a resistor to booty the abode of the temperature sensor, or abroad the ascendancy lath cuts ability to the laser afterwards a few seconds. The sensor reads about 50 KΩ at ambient temperature, so replacing it with article forth those curve should accumulate it happy. In the afterward angel you can see the 40 KΩ resistor I’m currently using.
I’ve been on article of a deliver bang for a while now, so I generally anticipate of purchases like this in agreement of what affectionate of advantageous accouterments I was able to extract. For $14, I’ve got to say this is a appealing appropriate score:
From the eyes area we’ve got a nice little geared motor, a axle combiner, and four optical gratings. Three laser modules and a disciplinarian lath than can ability any aggregate of them at once. Two heatsinks, one with an chip temperature sensor. A tiny little calefaction pad, and assuredly a asperous attractive 5V/2A adapter.
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By the time you apprehend this it’ll apparently be too backward to breeze one of these up yourself, but there’s consistently abutting year. Who knows what abject aliment will be abiding on the shelf appear New Years 2018?
Do you accept account for added absorbing finds we can breach down? Let us apperceive in the comments below.
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