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Author Topic: Arduino UNO and Rainbowduino  (Read 1532 times)
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Hi, I am very new to Arduino. Recently, I am trying to use Arduino UNO(328) to control a 8X8 LED matrix driven by Rainbowduino(328).

Rainbowdduion http://www.coolcomponents.co.uk/catalog/product_info.php?products_id=497
LED matrix http://www.coolcomponents.co.uk/catalog/product_info.php?cPath=45_69&products_id=623

After I plugged in the LED matrix to the Rainbowduino and used the 5v output from the Arduino UNO to power up the Rainbowduino, only some LED on the matrix were on.(a picture of the LED matrix is attached) According to the video tutorial, aren't all the LED should on?

When I uploaded both firmwares for the Aduino UNO and Rainbowduino and connected them using I2C, there was nothing happen. The matrix was still the same pattern.

Does anyone have an idea?


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Sounds like you might have the matrix plugged into the Rainbow upside down... try rotating it?
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Hi Fudge,

I tried that, it was just another pattern.
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your not supplying enough voltage to the rainbowduino, you need to run the voltage anywhere between 6v and 9v
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