led matrix

Hi there!

i bought a common cathode row led matrix, but i can't find anyway to connect it and make all rows works. Any body can drop me a line?

The Playground has quite a few articles to help you, including one that needs no extra components if you have the Sparkfun 8x8-style matrix and a strong, healthy Arduino.

Try the articles under “LED Lights and Displays” here:
http://www.arduino.cc/playground/Main/InterfacingWithHardware#Output

Or this one for a quick and easy noodle around:
http://www.arduino.cc/playground/Main/DirectDriveLEDMatrix

That should get you started on the circuit and the various way to control it.