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Old 02-21-2014, 11:18 PM #1
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Question TTL modulation Laser Harp

So my friend and I (Juniors in High School) are building the second model to our Laser Harp, this one if going to be frameless.
It works by having a laser shine on and off very quickly onto a mirror attached to a stepper motor. The stepper motor moves when the laser is off to a new position, the laser turns on then off and so on. With the quick movement of the mirror it appears as if multiple beams are shining at on time. We are going to be building two of them. We already have a green framed one with a cheap $12 module.
My Actual Question
Would the lasers listed below be able to effectively be seen with a fog machine, and will the TTL modulation work (fast enough)? We don't fully understand lasers but we understand the programming quite well. Thanks for your help.



445nm 450nm 300mW Blue Laser Module TTL Modulation | eBay

660nm 200mW Red Module Solid Red Laser Beam R200 | eBay


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Old 03-06-2014, 05:14 AM #2
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Default Re: TTL modulation Laser Harp

Drk2;

It looks like a fun project.

The Red and Blue lasers will respond faster than the green laser you are currently using.

In regards to the TTL modulation,

most China vendors state 20 KHz or 20,000 modulations per second,

so you should be OK there.

Of course, the true test is to actually try the system.

Use some protective goggles for these two more powerful lasers.

With fog they should quite visible.

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Old 03-06-2014, 06:19 AM #3
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Default Re: TTL modulation Laser Harp

Have you been able to get the stepper motors to actually step fast enough to make this work well? Due to their large rotor mass they tend to suck at accelerating quickly, which is what you need in a laser harp.
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