Espressif ESP8266 User Manual

B. OLED Display
With the display, you also have many options: do you want the pixels to be white or blue, or
do you even prefer a two-color display where the footer is in one color and the rest in another?
What really matters is the driver chip and the protocol. The OLED library currently supports
I2C and SPI for both the SSD1306 and the SH1106 chip. The first is often used for 0.96” inch
displays while the second one is used for 0.96” displays. Displays with SPI interface will
consume more of your free GPIO pins.

Espressif ESP8266 Specifications

General

Digital I/O Pins	17
Analog Input Pins	1
Wi-Fi	802.11 b/g/n
Operating Voltage	3.0V - 3.6V
Clock Speed	80 MHz / 160 MHz
Operating Temperature	-40°C to 125°C
Dimensions	24mm x 14mm
Processor	Tensilica L106 32-bit micro controller