Led Sign Board Build Project:

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  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 31003
    • Albion

    #21
    Re: Led Sign Board Build Project:

    go look at the led stuff here:
    http://www.banggood.com/

    like these:
    http://www.banggood.com/CJMCU-64-Bit...-p-981678.html

    http://www.banggood.com/100Pcs-DC-5V...-p-979463.html

    http://www.banggood.com/CJMCU-40-Bit...-p-997521.html

    Comment

    • diif
      Badcaps Legend
      • Feb 2014
      • 6978
      • England

      #22
      Re: Led Sign Board Build Project:

      Originally posted by stj
      go look at the led stuff here:
      http://www.banggood.com/
      ....and all their other cool stuff

      Cheers stj

      Comment

      • Spork Schivago
        Badcaps Legend
        • Mar 2012
        • 4734
        • United States of America

        #23
        Re: Led Sign Board Build Project:

        Originally posted by stj
        i read that one supplier gives a discount to EEVBLOG members.
        and i know another gives a free UNI-T meter wih every order over £200
        (NO, not the UT-61E )
        They do. The only supplier I know that does this is TEquipment.NET. It's either a 6% discount or a 9%, can't remember. I got the code in my private messages back on EEVBLOG if you want me to double check the discount.

        http://www.tequipment.net/

        They'll also price match certain things and give larger discounts if you buy a bunch of stuff at once, like a scope, a psu, multimeter, reflow station, etc.
        -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

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        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 31003
          • Albion

          #24
          Re: Led Sign Board Build Project:

          i tried to sign up at EEV but they never authorised the account - bastards.

          Comment

          • wiregrassbulldog
            New Member
            • Sep 2014
            • 2
            • USA

            #25
            Re: Led Sign Board Build Project:

            Interesting.

            How about using a raspberry pi zero ($5.00)?

            https://github.com/Boomerific/rpi-rgb-led-matrix

            http://raspberrypi.stackexchange.com...y-raspberry-pi

            Comment

            • stj
              Great Sage 齊天大聖
              • Dec 2009
              • 31003
              • Albion

              #26
              Re: Led Sign Board Build Project:

              zero is workable for a serial-drive design but not for a strobed matrix.
              you need to be able to directly control the hardware using machinecode for diect matrix-drive.

              an o.s. in the way will cause too much latency.

              a NUCLEO board - such as NUCLEO-F446RE would be unstoppable though!!!
              Last edited by stj; 12-06-2015, 08:41 PM.

              Comment

              • ben7
                Capaholic
                • Jan 2011
                • 4059
                • USA

                #27
                Re: Led Sign Board Build Project:

                Originally posted by stj
                zero is workable for a serial-drive design but not for a strobed matrix.
                you need to be able to directly control the hardware using machinecode for diect matrix-drive.

                an o.s. in the way will cause too much latency.

                a NUCLEO board - such as NUCLEO-F446RE would be unstoppable though!!!
                Agreed .. actually just about any MCU would work. That is, depending on your requirements (I/Os, speed, I/O bandwidth, etc..).

                P.S. I'm making a digital clock with RGB LED strips as the segments, and in order to save on I/Os, it scans the display. It does so fast enough to make the whole thing look lit up (persistence of vision). The downfall is though, I bet it'll make some EMI ... it's at least 2.5 feet wide, not 2.5 inches :P (thus it acts like a big antenna)
                Also, due to the circuit design, different digits can be different colors, but not different color segments (in the digits themselves). Then it would have to scan more segments, and use an even higher current through the LEDs to get a good brightness level...

                -Ben
                Muh-soggy-knee

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