I need some peggy advice please.

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  • #20189
    jimcanswim
    Participant

    Hi, I am new to all this so please bear with me.

    I want to make a few marine charts with bouys which flash in a certain sequence. What would be the most suitable thing? Peggy 2? Peggy seems a bit overkill though.

    I want to have about 60 Leds that flash in different sequences, I will have to wire each led to a flying lead and connect this to peggy, which seems quite difficult.

    Also what are they physical dimensions of peggy and what duration does the batteries have?

    Thanks for any advice.

    • This topic was modified 2 years, 6 months ago by Windell Oskay.
    #21181
    Windell Oskay
    Keymaster

    The Peggy 2 (or 2LE) can do it, but it is indeed overkill. Probably the most straightforward way to use it would be to wire up 6 rows rows of 10 LEDs each, meaning that you’d need to run a total of 16 wires to the Peggy.

    The Peggy 2 is 11.320×14.875″ in overall size:

     http://shop.evilmadscientist.com/productsmenu/tinykitlist/75-peggy2

    You might prefer to use the Peggy 2LE instead, as it is smaller (9.625×5.9″) and lower in cost:
    http://shop.evilmadscientist.com/productsmenu/tinykitlist/157

    The Peggy 2 comes with a 3xD battery holder. One can be added separately to the Peggy 2LE as well: http://shop.evilmadscientist.com/productsmenu/partsmenu/552
    I’d estimate battery lifetime under this set of circumstances as about 150-250 hours if the LEDs are on all of the time, and 2-5 times that if the LEDs are flashing intermittently.  I’d certainly recommend turning it off when not needed or (much better) using a plug-in power supply.
    Since you don’t need all that many LEDs, and they don’t need to be on all the time, you might consider using Charlieplexing, directly from a microcontroller, to drive the LEDs instead.   For 60 LEDs, you could do this with a microcontroller board like our Diavolino, using 9 digital output lines to drive a hand-wired matrix.  For a bit more about Charlieplexing, see our article about how the Bulbdial Clock works:
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