Max7219 is a type of common cathode display unit of integrated serial input / output, it connects the microprocessor with a seven-digit eight-segment digital led display, it can also connect the line graph or 64 independent leds. It includes a piece of type b bcd encoder, multiplexing scanning circuit, word movement period, but also a static 8 * 8 ram is used to store each data. Only an external register used to define the current period of each led. A convenient four-wire serial interface can be added to all general microprocessors. Each data can be addressed in the update does not need to rewrite the entire screen. Max7219 also allows users to code each code or select data.

The device contains a 150 mu low power shutdown mode, analog and digital brightness control, a scan limit register allows the user to display 1-8 bits of data, there is also a leave all detection mode led.

Four corner pcb with copper screw fixing, which can effectively prevent short-circuit accidents from happening!

The four digital tube is 0.36 inches a common digital cathode tube This module is compatible with 5 v / 3.3 v microcontroller (51 / avr stm32.) Wiring instructions (in order to provide the program, for example, you can choose any mouth io, modify ports defined in the program): The vcc-5 v Gnd to gnd Din-p00 Cs-p01 The clk-p02 Note: note: 1. the vcc and gnd do not pick up, so as not to burn the chip 2.51 scm p0 port needs to pull the resistor, if your microcontroller could not pull the resistor, it can be cable to other ports Shipping list: 1. the digital tube display module max7219 1 2. straight line needles 5 p 3. the line needle bending 5 p