Member Since: July 25, 2008

Country: United States

  • Congrats, I’m really excited for your team! Thanks for always being so transparent with your business. It’s very enlightening to me as a fellow business owner. We started about the same time as you and have seen similar issues (including the business name issue), although on a much smaller scale.

  • So I just got 2 more of these and am trying to daisy chain them together. I’m trying to make my best guess using the RGB examples out there, but I can’t even find any confirmation that these RG matrices daisy chain “out of the box”.

    I’m trying the following code in the setup, for 2 boards, per the documentation:

    // Configure boards      
    digitalWrite(CHIPSELECT,LOW); // enable the ChipSelect on the backpack
    spi_transfer('%'); // % byte
    spi_transfer('2'); // num boards
    digitalWrite(CHIPSELECT,HIGH); // disable the ChipSelect on the backpack

    However, it’s not working when sending 128 bytes in the loop() part of the code.

    Anyone have advice for daisy chaining the RG Backpacks? Thanks!

    Update 3/10/2012

    I have this working on two screens, but now I’m having a ghosting issue. Please see the forums at for more info.

    Update 3/18/2012

    Ghosting issue has been resolved. Please see forum linked above.

  • Thanks for your help Jim. That code works great. I just tried a 9V, 600ma wall wart power supply and it’s the same story. Code won’t show up with Vcc on 5V. If I unplug it then LEDs light up and animate. When I plug Vcc back in, then the LEDs get brighter, but the animation (red/green blink) stops.

    I’m stumped right now.


    The above issue does not occur on my Arduino Uno. So there’s something going on with my Arduino NG…


    Here’s a little video of it working side-by-side with a Processing sketch. I’ll update the video page when I have some code to post that goes with it.

  • Hi Jim. Thanks for the reply. I actually FINALLY did get it (kind of) working. I’m using the code on the Arduino Forums at, with the connections as you and others have noted.

    I’m still having an issue though. My code will only work if the power line (Vcc) is floating. If it’s plugged into 5V on the Arduino (NG) power rail it will not work (Arduino is running on USB power). If I unplug the power line, the matrix will light up with the programmed pattern, and then if I re-plug Vcc into 5V the pattern gets brighter.

    I just updated the code to display an alternating pattern, which will work with Vcc floating, but the moment I plug it into 5V on the Arduino the pattern stops alternating.

    Has anyone seen that or have any ideas?

  • Does anyone have any working Arduino code for the Red / Green only backpack? I’m a little disappointed that this isn’t working as easily as I thought it would.

  • Agreed, pictures need to get fixed.

  • These would be great for university book shops. I can see a lot of EE, ME, architecture or industrial design students wanting to add these to their projects.

  • Hey guys. I can completely sympathize. My brother and I own/operate a business that has been online for 3 years and this last july we got a nearly identical letter. It was incredibly frustrating. We were told by lawyers on our board that it was a 50/50 chance of winning in court but that it would cost thousands of dollars in fees just to fight the battle - something we can’t afford to do. As a result, we’ve spent the last 4 months changing our name. It’s almost like losing a loved one.
    I truly wish you guys the best of luck. I love what you are doing. You provide unique parts to hobbyists and create a fun learning atmosphere that I believe is needed to fuel a new generation of inventors.
    Keep your chins up!

  • Would you mind sharing who you are hosting with? I’d like to move a site of mine from a dedicated server to a load-balanced cluster. It’s a new concept to me and I’d be curious to know who’s hosting it for you and if you like them. Thanks!

No public wish lists :(