General Category > General Discussion
About the Lasershark projector
Macpod:
A TTL laser will let you turn the laser on or off. An analog laser will let you make the laser brighter or dimmer. This is useful as it would allow you to have different line brightnesses in a lasershow. For example if you spelled out LASER, you could make the L very bright while the R could be made very dimm.
You can also make the laser look brighter or dimmer by turning it on/off very quickly with a ttl laser too but to make this happen with a lasershark you would need more hardware.
--- Quote ---2.Emitter subsystem: At first we found this.520nm Green Laser Diode Module
It is straightly powered by a DC input power supply optional. But we found that it has no TTL modulation or analog modulation.
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While you could use this laser, it would have to always be on (because there is no way for the lasershark to control it). I would not recommend this as the beam can still look very bright if the galvos are not moving. There will also be traces between shapes
--- Quote ---And here are some other alternative lasers(feels hard to find a 5mW or about ones. ):
1.w/12V AC Adapter 515nm 520nm 50mw Grass Green Laser LINE Module Osram LD TTL
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This is a line laser module As opposed to drawing a dot, it draws a line. You would not want this
--- Quote --- 2.10mW 515-520nm Direct Diode Green Laser Module (Adjustable Focus) with TTL Modulation (12V)
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This one would be OK. It is greater than 5mW and would require a variance in the U.S. in some use scenarios. To make it dimmer you may be able to adjust the potentiometer but be careful as you can also make it brighter if you turn it the wrong way. You may find the block-format the laser is in very helpful for mounting reasons (you will have to align the laser with the galvo mirrors carefully)
I like that this unit has a fan too. I also see LaserLands sells these for a little cheaper (this is not an endorsement for laserlands):
https://www.laserlands.net/diode-laser-module/520nm-laser-module/3350-520d.html
They also have a 20mW laser that could likely be dialed down power-wise 20mW would still be very bright for your application:
https://www.laserlands.net/diode-laser-module/520nm-laser-module/focusable-515nm-20mw-green-laser-module-osram-ld-in-12v.html
--- Quote ---3.Scanning subsystem:
1.40Kpps High Speed galvo scanner for laser show lighting/RGB Laser system ScannerIt says that it acquires the "Deflection angle: max 70° optical (factory calibration @±25°)" and we are not sure whether it is enough to project patterns in the height of 1-1.5m to the 2-3m far distance from where it is set.
2.
30Kpps HightSpeed Galvo scanner for Laser light show or 3D printer (max50Kpps)
It looks like that all the galvos detailers have the similar description of the spec details
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I would recommend using geometry compute how wide a scan angle you need. Both of these galvos kits seem more expensive than they should be.
--- Quote ---4.And some cables or board to set them up. Or maybe a laser glasses?
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Safety glasses are a great idea. You will need to purchase glasses according to the wavelength of light you will be using. They usually protect against one or more ranges. I.e these pair covers 190-540nm with an OD5 rating:
https://www.survivallaser.com/Eagle_Pair_190540nm_OD5_Standard_Laser_Safety_Goggles/p556088_2780808.aspx
Frequently the galvos kits come with the cables to connect the gavo amplifiers to the Lasershark. I would reccomend waiting for those to come in before buying cables. You should start thinking about making a mount to align the laser with the galvo mirrors.
zhang:
Thank you very much! Sorry to reply so late because of the login session error these days on the forum.
Now we are about to buy components and start to think about how to make a mount to combine the galvo and laser pointer. (Of course other things too) Maybe a wood pad easy to deal with? (like the v1 lasershark macpod).
As for the necessary angle of galvos, it is difficult to assert how large the angle we need. Therefore, we'd choose the one with a reflection angle as large as possible and the fast speed. (marcan's and now the one we decided all 35°(max 70° +- 20°) ) The laser show projector now we used can only project a small pattern on road than the one we want(attachment 1)
And a thing must be confirmed that are there some troubles in running Openlase in Windows 10? The software we developed is now running in Windows, and if it must do it in Linux, we have to do some adjustments right now.
Edited: And the 12V PSU for the laser pointer always seems too high. The working current of the laser pointer is about 200mA but most 12V output PSU can't supply the low current. On the lasershark v1 board, I found that you have two PSU and connect the small one to the large one. So one AC input is enough. Shall we do this?
Macpod:
For a prototype you could use wood/screws and thin cardboard (i.e. cereal box) to shim/align items. If you have access to a 3-d printer you could design a mount that way.
I personally have not used openlase under windows 10. I have also only compiled lasershark_jack for Linux which is needed to use a LaserShark with OpenLase.
While it is important to match PSU voltages it is not a problem if your power supply can supply more current than the laser/etc designate. Normally when I spec I PSU for a project I make sure the current rating is at least 20% higher than what the circuit calls for.
zhang:
Thanks so much, and we just have a 3D-printer from last month. Still at step like trying to copy small component of Segway and it seems to be a good start.
And I see..we'd better do our task on Linux. :D If you come back please let us know and we'd like to order Lasershark straightway.
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