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Thread: question about modulation with arduino

  1. #1
    Join Date
    Dec 2013
    Location
    Sydney Australia
    Posts
    5

    Default question about modulation with arduino

    Hi Guys,
    I got some laser modules from CNI in China,

    I need them for some art installation, not really for a projector, just using the modules to project beams in different frequencies.

    So the question i have is this:
    my laser modules are TTL modulated,
    I have not tested them yet,

    so can I generate the TTL modulation frequency with an arduino?
    http://arduino.cc/en/Reference/tone

    I found on the internet that the modules can be modulated on a frequency of 0-10KHz.

    so can I use the arduino?, will I see the beam blinking? [what i need]

    I just want to confirm before I connect the modules,

    Thanks a lot!

  2. #2
    Join Date
    Dec 2008
    Location
    Vezon, Belgium
    Posts
    1,017

    Default

    I think the question is self-answered, as you want to feed a TTL input with a TTL signal

    You just have to pay attention to output current capability of the arduino PWM output and impedance of the driver TTL input

    for the price of an arduino, you can have a quick setup for nothing, and start experimenting fast... a µcontroller will output a square TTL signal at its PWM output at a configured frequency and duty cycle, and you usually have multiple outputs, or even PWM generator chips with several outputs so you can play with phase and do fun things with rotating mirrors...

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