I recently purchased 3x https://www.sparkfun.com/products/759
https://dlnmh9ip6v2uc.cloudfront.net/im … 759-01.jpg
And i’ve been trying to test out sample codes that were on the site using Arduino Duemilanove, (http://www.sparkfun.com/datasheets/Comp … X_CODE.zip)
Everything was wired in correctly (I was helped by an experienced arduino user) and all that really happened when code was loaded was a flash of 3 colours scrolling 3 times.
At first we thought that this was what the code was supposde to do, so we tried other code (http://tokage.cafe24.com/ww/2008/01/led_backpack.html) and then we discovered that the code was not being output.
We tried another Arduino board (Arduino MEGA) and the same results.
We tried to rewire it with newer wires and the same results.
Does anybody have any experience with this LED backpack and could give a few pointers on what was wrong?
I don’t know if it’s been fixed but apparently there was (? is ?) a problem with the connections. See the comments on the product page.
Skaros444 | about a year ago
Hey Sparkfun, just wanted to let you guys know that the MISO and MOSI pins on the SPI headers for the RG Matrix backpack are switched around. The “input” header should have MOSI instead of MISO. The schematic is also incorrect.
I picked one of these up a few weeks ago for a project and couldn’t figure out why it wasn’t working. I ran a wire to the other header of the backpack and it works fine, but this works terribly for any sort of backpack daisy-chaining.
**mark4 | about a year ago**
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.
Jim D | about a year ago
Hi Mark, Do you still need some example code?
Also, as noted above by Skaros, this board has an error. Use the ‘SPI Output’ connector as the input and ‘SPI Input’ as the output and it works fine. They mixed up the MISO and MOSI signals.
Jim
