Shop OBEX P1 Docs P2 Docs Learn Events
Sparkfun RGB backpack — Parallax Forums

Sparkfun RGB backpack

WebheadFredWebheadFred Posts: 27
edited 2010-02-05 13:52 in Propeller 1
Greetings,
I'd like to attempt to control an array of these little backpacks from Sparkfun with the propeller. I've read the sticky about interfacing the 3.3v propeller with 5v devices and still had a few questions. With the attached diagram as a reference using the SPI objects, do I need 10k resisters between the Propeller and the SCK pin, and between the Propeller and the CS pin since the backpack unit is 5v based? From my understanding, The 3.3v from the Propeller to MOSI pin should be fine as it is since it's above the logic level.
Thanks in advance and kind regards to all.

Fred

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Why be one if you can't act like one? Knoxville, TN
SPI.gif
308 x 249 - 4K

Comments

  • Timothy D. SwieterTimothy D. Swieter Posts: 1,613
    edited 2010-02-05 05:55
    Webheadfred - can you provide a link to the specific SparkFun product? I googled a bit, but I am not sure if I am looking at the same product you are. Once we are on the same product page I can understand that product and better advise on the interface.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Timothy D. Swieter, E.I.
    www.brilldea.com - Prop Blade, LED Painter, RGB LEDs, 3.0" LCD Composite video display, eProto for SunSPOT
    www.tdswieter.com
  • WebheadFredWebheadFred Posts: 27
    edited 2010-02-05 12:52
    Tim - Thanks for the help! Here is the link for the Sparkfun RGB backpack controller: www.sparkfun.com/commerce/product_info.php?products_id=760


    Best Regards,
    Fred

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Why be one if you can't act like one? Knoxville, TN
  • Zap-oZap-o Posts: 452
    edited 2010-02-05 13:52
    It can not hurt. I would at the least put the resistor on the Data link. Although if data is only going out then you would not need any resistors on any lines.
Sign In or Register to comment.