Circuitrocks MAX7219CNG LED Matrix Digit Display Driver MAX7219

Circuitrocks. The MAX7219 does all the control and refresh work for you in driving either an 8x8 matrix display or 8 x 7-segment displays usually these also have a dot so its really an 8-segment display-64 LEDs total. All you have to do is send it serial commands via the 4-pin SPI interface and it will auto-magically take care of the rest. Wiring is simplified as well, you only need to set the current level for all LEDs with a single resistor instead of 8 and you can also dim the entire display digitally. It's a thru-hole chip so you can use it in any breadboard, perfboard or other project, although if you're soldering it in, we suggest using a socket. When you need some help driving a lot of LEDs, the MAX7219 is the best friend you could hope for. Many of us know that if you want to control a lot of LEDs, you'll want to usemultiplexing, a technique that lets you control 64 LEDs say with only 16 pins 8x8). The annoying thing about plexing is that you need to use 8 power transistors or