Interfacing 2.4" SSD1309 SPI OLED Display With ESP8266

In this tutorial, we’ll learn how to connect 2.42" SSD13093 SPI OLED display with ESP8266. As a development board, we’ll use ESP8266 NodeMCU board.

SPI Pins in ESP8266 NodeMCU Board

ESP provides two SPI ports. However, the ones on the left side (SD1, CMD, SD0, CLK) cannot be used as it’s reserved for flash communication…