I was trying to develop a new hobby and decided to build a small project using ESP8266 and LED 8x8 Max7219. I found a few tutorials on the internet, but it seems nothing works for me. Please give me a hint about what I'm doing wrong.
The board is
Esp8266 Nodemcu Wifi Dev. Board - Wemos 32mb Cp2102
Also here is the gist with code
And I also attached a photo of my assembled circuit.