Hello gang I have a Arduino Mega with a led matrix 8x32, I try to run a example from Adafruit, MatrixTest, it display a Howdy on the matrix. It work great when I use the 5v power from the Arduino, but when I use the power supply (5v 10a) third of the matrix open (very bright) with some animation i…

Led matrix with external power

PaulRB January 25, 2018, 10:33pm 6

PaulRB:
Do you have common ground between the Arduino and the external power supply?

lebill:
Wow, thanks Mike

It's fixed my issue, the common ground thing.

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