#define SCREEN_WIDTH 128 // OLED display width, in pixels The entire 1K memory, including pages, segments, and data, is highlighted below. That certainly proves that we have:Ĩ pages x 128 segments x 8 bits of data = 8192 bits = 1024 bytes = 1KB memory And, each column can store 8 bits of data (from 0 to 7). Each page has 128 columns/segments (block 0 to 127). This 1 KB memory area is divided into 8 pages (from 0 to 7). Regardless of the size of the OLED display, the SSD1306 driver includes a 1KB Graphic Display Data RAM (GDDRAM) that stores the bit pattern to be displayed on the screen. In order to control the display, it is crucial to understand the memory map of the OLED display.

A typical OLED display uses about 20mA on average, though this varies depending on how much of the display is lit.īecause of their high contrast, these OLED displays are highly readable and can display impressively detailed graphics. The absence of a backlight reduces power consumption significantly.

This explains the display’s high contrast, extremely wide viewing angle, and ability to display deep black levels. Also, the SSD1306 controller’s operating voltage ranges from 1.65V to 3.3V, making it ideal for interfacing with 3.3V microcontrollers such as the ESP8266.Īn OLED display, unlike a character LCD display, does not require a backlight because it generates its own light. At the heart of the module is a powerful single-chip CMOS OLED driver controller – SSD1306, which handles all RAM buffering, requiring very little work from your ESP8266.

Esp8266 problem with wire library