I’m working on a 5 x 5 x 5 RGB (125 LED) led cube, with a 5 Rainbowduino cascade.
I need to increase the output current up to 40mA per LED (125 RGB LED x 3 = 375 LED).

We are working with Rainbowduino 3, there is a pin R-EXT on the MBI 5168, but there is no access to the Pin on the board.
Is it possible to connect a resistor onto this Pin?

in advance thank you!


you can change the REXT resistor to change the driver current.
the raibowduino use my9221 , not 5168 to drive the LEDs. The R-EXT is R7~R12.