Last time I looked on Amazon I could get five I2C 0.96″ OLED SSD1306 displays for $14.99 (ASIN B08QJ7BL3R), that’s $3.00 each.[1] Why are two microcontrollers being used? The I2C displays maybe?

At this point, I got very discouraged, set this OLED in my electronics box, and forgot about it. A few months past and I gained some interest in making this OLED work. Therefore, I started to do some ...

Powered by an ATMega328p pulled out of an Arduino Nano, ... A basic user interface is provided by two tactile buttons on the PCB as well as an 128×32 I2C OLED display.

Features of the Pixelduino Arduino OLED display include : – Processor : Atmel Atmega328P @ 3.3V / 8MHz – IO pins : 14 digital, 6 analog – Memory : 32K flash, 2K RAM ...

With it, via I2C, I could add an Arduino Pro Mini, and an I2C Oled Display and make a watch capable of having all this information, plus a pedometer (by analysing accelerometer data).

Next steps shows how the master (Arduino) reads from the slave I2C device. Wire.requestFrom(address, 1) command expects to receive 1 byte of data from the TC74 sensor. Wire.available() waits for data ...