Driving a LED matrix from a Netduino one more time: The Right Way
In previous posts, we've seen two ways one can drive a small LED matrix from a Netduino . The first time , we just turned the rows and columns of the matrix on and off using digital ports on the Netduino. With this method, we have great control for sure, but it's no good for the following reasons. It's very slow: the digital ports on the microcontroller don't switch very fast. What kills it though is that we don't have enough digital ports on the Netduino: for an 8x8 matrix, you would need 16 ports and we only have 14. not to mention the final system we're building will need some ports for other things than display. With the second and third posts, we used a shift register. The way you talk to a shift register is that
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Read the complete post at http://weblogs.asp.net/bleroy/archive/2011/03/24/driving-a-led-matrix-from-a-netduino-one-more-time-the-right-way.aspx