5PCS MAX7219 8-Digit 7-Segment Digital Display Module for Arduino, 51/AVR/STM32, Raspberry Pi, ESP8266, Nodemcu, Integrated Driver

MAX7219 8-Digital 7-Segment Display Module

MAX7219 is an integrated serial input / output common-cathode display drivers, which connects the microprocessor 7-segment digital LED display with 8 digits, you can also connect a bar graph displays or 64 independent LED. On which includes a B-type BCD encoder chip, multi-channel scanning loop, segment the word drive, but also an 8 * 8 static RAM for storing each data. Only one external register is used to set the segment current of each LED.

• Display: 0.36" 4 digit led display 7 seg segment Common cathode Red
• Power: 5V
• Material: PCB + Electronic Components
• Size: 82 * 15 * 18mm Color: Red

Note: VCC and GND Do not reversed, it would burn the chip.

51 MCU P0 port requires pull-up resistor, if your device does not have a pull-up resistor can be connected to other ports data lines

What is going on in this situation?

If all five are not working or all display is incomplete, then there may be a code error, you can con tact us to get the correct code or tutorial.

Finally:

This requires the Led Control library to be installed – https(:)//github(dot)com/wayoda/LedControl

Tutorial Links:

1. https(:)//www(dot)hackster(dot)io/mitov/7-segment-display-clock-with-max7219-and-ds1307-rtc-a028b9
2. https(:)//circuits4you(dot)com/2016/05/19/max7219-segment-display-arduino/
3. http(:)//arduinolearning(dot)com/code/arduino-max7219-7-segment-display-module-example(dot)php