link:https://pan.baidu.com/s/1F7y3tnxFHyY38Cgc7W-DFg Extraction code：9aut

Greatly save your MCU resources, do not need to open the timer to scan, free the MCU to do more things! You only need to transfer the data once when updating the displayed data!

MAX7219 digital tube display control module

MAX7219It is an integrated serial input/output common-cathode display driver, which connects a microprocessor and an 8-digit 7-segment digital LED display. It can also be connected to a bar graph display or 64 independent LEDs. It includes an on-chip B-type BCD encoder, multiple scan loops, segment word drivers, and an 8*8 static RAM to store each data. There is only one external register used to set the segment current of each LED.
A convenient four-wire serial interface can be connected to all general-purpose microprocessors. Each data can be addressed without rewriting all the displays when updating. MAX7219 also allows users to select encoding or not encoding for each data.
The entire device includes a 150μA low-power shutdown mode, analog and digital brightness control, a scan limit register allowing users to display 1-8 bits of data, and a detection mode that allows all LEDs to emit light.
Only need 3 IO ports to drive 8-bit digital tube! No flicker when the digital tube is displayed! Support cascading!
The four corners of the PCB board are fixed with copper studs, which can effectively prevent accidents such as short circuits from happening!
The digital tube is a 0.36 inch 4-in-one common cathode digital tube

This module is compatible with 5V/3.3V single-chip microcomputer (51/AVR/STM32...)
Wiring instructions (take the provided program as an example, you can connect any IO port, just modify the port definition in the program):

VCC→5V

GND→GND

DIN→P00

CS →P01

CLK→P02

Precautions:

1. Don't connect VCC and GND reversely, so as not to burn out the chip

2.51 The P0 port of the single-chip microcomputer needs to be connected with a pull-up resistor. If your single-chip microcomputer is not connected with a pull-up resistor, you can connect the data line to other ports

Shipping list:

1. MAX7219 digital tube display module 1
2. Straight pin 5P
3. Curved pin 5P