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?

One day, [mitxela] got bored and decided to build his own HDMI monitor – the unconventional way. HDMI has a few high-speed differential pairs, but it also has an I2C interface used for detect… ...

The combination of a transparent OLED display, Arduino Nano Every microcontroller, HC-05 Bluetooth module, and a small LiPo battery results in a functional and versatile piece of wearable technology.