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  1. 17-07-2021 #23
    m_c's Avatar
    Lives in East Lothian, United Kingdom.
    m_c
    Last Activity: 9 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has a total post count of 2,969. Received thanks 368 times, giving thanks to others 9 times.
    One thing I've not seen mentioned, is how are the laser and arduino powered, and are they suitably connected?

    If both are powered from the same 12V supply, they should already share a common ground, but if you're powering them independently (i.e. 12V to the laser, but relying on USB power for the Arduino), then you'll need to connect the Arduino ground to the laser/12V ground. Without that connection, the TTL/PWM control circuit won't be complete, and nothing will likely happen.
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