M5Stack CoreInk - ESP32 E-Ink Display Development Board

<p>M5Stack CoreInk - ESP32 E-Ink Display Development Board</p><p>The M5Stack CoreInk is a compact, ultra-low-power development board built around the ESP32-PICO-D4 (dual-core, Wi-Fi + Bluetooth) with a 1.54inch black/white E-Ink (E-Paper, GDEW0154M09 panel) display at 200x200 resolution. A built-in BM8563 real-time clock lets the board wake from deep sleep on a schedule without keeping the main chip powered, and the onboard 390mAh Li-Po battery (rechargeable over USB-C) makes it suited to always-on, battery-run displays such as badges, price/shelf labels, and low-refresh dashboards.</p><p>Input is a single side button plus a 3-position dial switch (up/press/down) for menu navigation, and a HY2.0-4P Grove-style port breaks out a second, external I2C bus for sensors. Programmable via the Arduino IDE (M5Stack board package) or UIFlow. Correction (18 Aug 2026): this listing originally stated a microSD slot and a 203mAh battery - CoreInk has no SD slot, and the verified official battery figure is 390mAh; both are fixed below.</p><ul><li>MCU: ESP32-PICO-D4, dual-core Xtensa LX6 @ 240MHz, Wi-Fi + Bluetooth</li><li>Display: 1.54in E-Ink, 200x200, black/white, GDEW0154M09 panel</li><li>RTC: BM8563 (PCF8563-compatible) for scheduled deep-sleep wake</li><li>Battery: built-in 390mAh Li-Po, USB-C charging</li><li>Input: 1 side button + 3-position dial switch (up/press/down)</li><li>Expansion: HY2.0-4P port (external I2C, SDA/SCL)</li><li>Connector: USB-C</li></ul>