SPECIFICATIONS

The module is a 12-pin display module with a 4-point common digital tube (0.36 inch) with a clock point. The driver chip is TM1637. It only needs 2 signal lines to enable the MCU to control the 4-bit 8- Segment digital tube.

The module features are as follows：

Display device is 4-digit yang red digital tube

Digital tube 8-level grayscale adjustable

Control interface level can be 5V or 3.3V

4 M2 screw positioning holes for easy installation

Control interfaceA total of 4 pins (GND, VCC, DIO, CLK), GND is ground, VCC is the power supply, DIO is the data input and output pin, CLK is the clock signal pin;

Digital Tube: 4-digit common anode with a 0.36-inch digital tube with a score point, highlighted in red;

Positioning hole: 4 M2 screw positioning holes, the hole diameter is 2.2mm, which makes the module easy to install and position, and realize the module combination;

Overview of the library routines:

1. ClockDisplay: Use the timer 1 of the MCU on the motherboard to time and let the 4-digit display display.

2. NumberFlow: 0~9, A, b, C, d, E, F and other 16 characters flow from right to left.

3. StopWatch: Use the timer 1 of the MCU on the motherboard to time, and use the button to realize the stopwatch function. 

Experiment equipment:

An Ard uino compatible motherboard Cat duino (not familiar with open source hardware can be understood as the Atmega328P microcontroller development board) and a mini USB cable;

1 4-digit digital tube display module;

4 male to female DuPont lines for connecting the control interface of the module and the Cat duino development board;

Experimental procedure:

1. Use 4 male to female DuPont lines 4-digit digital display module Connected to Cat duino, as shown in the following table and figure

2. Connect the Catduino with mini USB. If you are using the motherboard for the first time, its USB to serial driver can find the USB Drivers from the drivers in the Ard uino IDE directory.

3. Reopen the Ard uino IDE and click the Open button on the toolbar to open the NumberFlow routine in DigitalTube.

Select the serial port, board name, click the Burn button, you can burn. This routine can make 16 characters from 0~9, A, b, C, d, E, F, etc. flow from right to left.

The function of adjusting the gray scale of the digital tube is the set() function in the class TM1637, and the input parameter is 0~7. The larger the number, the higher the brightness.

MAX7219 is an integrated serial input/output common cathode display driver
It connects the microprocessor with an eight digit seven segment digital LED display,
You can also connect a line graph display or 64 independent LEDs.
It includes a B-type BCD encoder, multiplex scanning circuit, word drive cycle, and an 8 * 8 static RAM to store each data.
Only the external register is used to set the current cycle of each LED.
A convenient four wire serial interface can connect all general-purpose microprocessors.
Each data can be addressed in the update without rewriting all displays.
The MAX7219 also allows the user to select each data selection code or code.
The device contains 150 μ A low power off mode, analog and digital brightness control, scan limit register allows users to display 1-8 bit data, and A allows all LED detection modes.
The four corners of PCB are fixed with copper screws, which can effectively prevent short circuit accidents! Four digital tubes are 0.36 inches and one common cathode digital tube. The module is connected with 5 V/3.3 V microcontroller (51/AVR STM32...)
Compatible Wiring Instructions
(To provide programs, for example, you can select any IO port and modify the ports defined in the program): VCC-5 V GND to GND DIN-P00 CS-P01 CLK-P02
be careful:
1. VCC and GND do not pick up. In order not to burn out the chip 2.51 MCU P0 port, you need to pull the resistance. If your microcontroller cannot pull the resistance, you can connect the cable to other ports Shipping list: 1. MAX7219 nixie tube display module
2. Straight needle 5 p
3. Needle bending row 5 p
4. MAX7219 English data sheet
5. MAX7219 Chinese Data Manual
6. PDF format
7. Schematic diagram of MCU driver (single module display program and cascade module program)