Hi... I am testing out a 5x7 LED matrix, being driven by an MCP23018 I/O extender. Everything is working great, scrolling text and all. The problem is... The LED's are much brighter when only one light is on in a column, and much dimmer when all seven are on. I'm probably missing some basic electr…

Help with brightness levels on 5x7 matrix

Mr.Swarf March 11, 2011, 9:00am 17

Ok, that -is- cool. Kick ass even.

OP, sorry for the thread hijack!