After complex math and right wiring on my ESP8266, I finally light up my 4x7 segments display, one segment at a time. All the 4 selectors are connected to the 4 GND pins, so all four are lit up.
Do I need a MC or transistors to better select which display is lit up? Or is it possible with only the ESP8266 (I doubt)?
Here is the schematic of the 4x7 segments display (source: https://osoyoo.com/wp-content/uploads/2017/08/cathnode.jpg)
And the NodeMCU ESP8266 (source: https://i2.wp.com/randomnerdtutorials.com/wp-content/uploads/2019/05/ESP8266-NodeMCU-kit-12-E-pinout-gpio-pin.png?ssl=1)