Max7219-8×7 Segment Number Display
Max7219-8×7 Segment Number Display Module has eight 0.36″ 7-segment red displays with a built-in MAX7219 serial LED driver.
Easily programmable by microcontrollers such as an Arduino by SPI 3-wire serial interface.
Modules can be daisy-chained together to form larger displays.
The break-out pins on the left side with the pin labeling on top is the main input connector.
“Vcc” connects to 5V, and “GND” connects to Ground, which needs to be common with the microcontroller.
The other pins are for the SPI interface. “DIN” is the Data In. “CS” is Chip Select (sometimes labeled as LOAD), and “CLK is the Clock pin.
The module ships with the header pins loose to allow you to solder them on the top or bottom of the board and use the straight or right-angle pins depending on how you want to use the module.
Only one set of headers needs installation if the module will not be daisy-chained to another module.