[Verified] Laowu 1588 common anode dot matrix driver board

First, attach the website address:
Dot matrix (10 pieces for 1.9 yuan, shipping fee is 6 yuan)
MAX7219 chip (unit price is 0.97 yuan, free shipping)
Thermal conductive glue (unit price is 3.7 yuan, free shipping)
 
 
Applicable dot matrix: 1588 common yang lattice (not common yin ! ! )
The PCB is a four-layer board, and the size meets the free requirements and can be used directly.
 
See the picture for the installation direction of the dot matrix: (when the pin header is facing up and the chip silk screen is facing to the left, the dot matrix printed surface faces the right)
 
This is the direction of the dot matrix when viewed from the front:
 
Overview of the back:
 
MAX7219 chip (soldered on the heating table, with the pins looking at Pretty neat):
 
The effect after covering and protecting the chip on the back with thermal conductive glue (although it’s a bit ugly, it can prevent short circuits):
 
Thermal conductive glue used (3.7 yuan free shipping on TB):
 
Simply written using Micro:bit A test program (the program is in the attachment, the dot matrix needs to be placed upside down when using Micro:bit):
 
The data direction in the picture below is from right to left (the data signal is input from the rightmost pin header, and then the second from right to left Output from one pin header, then input from the third pin header, and finally output from the leftmost pin header. The four lines of purple, blue, yellow, and green are power supplies, directly connected to 5V):
 
Test program written using ESP8266 (program, See the attachment for the library file. The dot matrix is ​​placed correctly, and the font is slightly different from Micro:bit; the ESP8266 expansion board can be clicked to jump):
 
Wiring (consistent with Micro:bit):
 
The characters are garbled during debugging: