CoreInk is a brand new E-ink display in the M5Stack cores range, controlled by the ESP32-PICO-D4. This new device includes a 200x200 1.54" black and white E-ink display. Compared to a regular LCD, E-ink displays are easier on the eyes, making them a great choice for reading or viewing for longer periods. Other benefits include low power consumption and the ability to retain the image even if power to the display is terminated.

For control, the CoreInk integrates a multi-function button, a physical button, an integrated status LED, and a buzzer. The device also includes a 390mAh LiPo battery and an RTC (BM8563) for accurate timing and deep sleep functionality. CoreInk features independent reset and power buttons, as well as expansion ports (HY2.0-4P, M-BUS, HAT expansion) for attaching external sensors to expand functionality, offering unlimited possibilities.