Power Larson Scanner From Arduino

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  • August 11, 2021 at 5:42 am #29439
    AtomicDairy
    Participant

    I am incorporating the Larson Scanner into an Arduino build and would like to power it from one of the digital pins. The pins put out 5 volts and in tests the Larson Scanner is running normally. I know 5 volts is just below the max voltage for the chip but my concern is the LEDs. Am I overdriving them at 5 volts?

    August 12, 2021 at 1:54 pm #29444
    Windell Oskay
    Keymaster

    Yes, that’s overdriving them. You might consider dropping the 5 V to about 3 V by three regular silicon diodes, e.g., 1N914 or 1N4001, in series between your Arduino output and the power input of the Larson Scanner.

    August 12, 2021 at 4:28 pm #29445
    AtomicDairy
    Participant

    Many thanks! I was thinking I was about to fry my LEDs and now I won’t. Thank you for keeping my scanner alive!

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