Description M5Stack CoreInk is a compact ESP32 E-Ink development kit built around the ESP32-PICO-D4 and a 1.54-inch 200 x 200 black-and-white E-Ink display. The M5-K048 kit is designed for electronic label, IoT terminal, portable status display, and low-refresh dashboard projects where the screen should remain readable with very low power consumption. Unlike an LCD, the E-Ink screen on M5Stack CoreInk can keep displayed content after power is removed. This makes the CoreInk ESP32 controller a strong choice for an electronic label, an asset tag, an instrument status panel, or a battery-powered IoT terminal that updates only when new information is needed. The M5Stack CoreInk integrates 2.4GHz Wi-Fi, 4MB Flash, a 390mAh lithium battery, BM8563 RTC, programmable button, reset button, power button, green LED, passive buzzer, built-in magnet, HY2.0-4P port, M-BUS female connector, and HAT expansion. As a low power E-Ink controller, the M5-K048 ESP32 E-Ink development kit gives developers a ready hardware base for portable information screens. Features ESP32 E-Ink development kit: ESP32-PICO-D4 dual-core processor, 240MHz main frequency, 600 DMIPS, 520KB SRAM, 4MB Flash, and 2.4GHz Wi-Fi. Low power E-Ink display: 1.54-inch GDEW0154M09 black-and-white E-Ink screen with 200 x 200 resolution, 184 DPI, and nearly 180-degree viewing angle. Retained display content: the M5Stack CoreInk screen can keep the last image after power is removed, which is ideal for electronic label and IoT terminal applications. Portable power design: built-in 390mAh battery, BM8563 RTC, and sleep/wake support help the CoreInk ESP32 controller run low-refresh field tasks. Local interaction: programmable button, reset button, power button, green LED, passive buzzer, and dial-style control support compact HMI designs. Expansion ready: HY2.0-4P port, M-BUS female socket, and HAT expansion make the ESP32 E-Ink development kit suitable for sensors and external modules. Easy mounting: built-in magnet helps the low power E-Ink controller attach to shelves, panels, cabinets, and temporary test fixtures. Specifications SKU M5-K048 Product M5Stack CoreInk SoC ESP32-PICO-D4 dual-core processor, 240MHz DMIPS 600 SRAM 520KB Flash 4MB Wireless 2.4GHz Wi-Fi Input Voltage 5V @ 500mA Interfaces USB Type-C x 1, HY2.0-4P x 1, M-BUS female socket, top HAT expansion interface E-Ink Display GDEW0154M09, SPI interface, 1.54 inch, 200 x 200, 184 DPI, 1-bit black and white display, 2 grayscale Viewing Area 27.6 x 27.6mm Dot Pitch 0.138 x 0.138mm Refresh Time 0.82s full refresh, 0.24s partial refresh Physical Buttons Programmable button x 1, reset button x 1, power button x 1 LED Green LED x 1 RTC BM8563 Buzzer Passive buzzer x 1 Antenna 2.4G 3D antenna GPIO Breakout G25, G26, G36, G23, G34, G18, G21, G22, G14, G13 Battery 390mAh @ 3.7V Operating Temperature 0~60°C Enclosure Material Plastic PC Product Size 56.0 x 40.0 x 16.0mm Product Weight 31.5g Package Size 80.0 x 45.0 x 20.0mm Gross Weight 42.6g Applications Electronic label and shelf tag projects where fixed information should stay visible without constant power draw. IoT terminal dashboards for sensor values, device status, environmental readings, and field maintenance prompts. Portable ESP32 status displays that need Wi-Fi, battery power, RTC wake-up, and a low power E-Ink controller. Industrial instrument display panels, equipment tags, inventory labels, and simple on-device operation notes. E-book, low-refresh message board, and compact data logger display prototypes using the CoreInk ESP32 controller. Product List 1 M5Stack CoreInk 1 USB Type-C cable, 20cm Other Content The M5Stack CoreInk is best used when information changes periodically instead of continuously. For an electronic label or a battery-powered IoT terminal, the low power E-Ink controller can wake, refresh the screen, and sleep again while the display remains readable. Usage note: avoid long-term high-frequency refresh. The recommended refresh interval is 15 seconds per refresh. Do not expose the M5Stack CoreInk E-Ink screen to ultraviolet light for extended periods, because irreversible screen damage may occur. The PinMap and hardware overview help identify the E-Ink display pins, user button, LED, buzzer, power control, RTC, USB-to-TTL, HY2.0-4P custom port, M-BUS, and HAT expansion before building with this CoreInk ESP32 controller. Resources M5Stack CoreInk Documentation CoreInk Schematics PDF ESP32 Datasheet BM8563 Datasheet SY7088 Datasheet GDEW0154M09 E-Ink Display Specification M5Unified Arduino Library M5GFX Graphics Library CoreInk Factory Test Example CoreInk Factory Test EasyLoader FAQ What is M5Stack CoreInk best for? M5Stack CoreInk and M5-K048 are best for electronic label, IoT terminal, portable status display, asset tag, and low-refresh ESP32 projects that benefit from a readable E-Ink screen. Does the E-Ink display keep content after power loss? Yes. The low power E-Ink controller can retain the displayed image after power is removed, which is why the M5Stack CoreInk works well as an electronic label or low-refresh IoT terminal. Can CoreInk be expanded with sensors? Yes. The CoreInk ESP32 controller provides HY2.0-4P, M-BUS, and top HAT expansion interfaces, so sensors and M5Stack modules can be connected for data display projects. What should I avoid when using the E-Ink screen? Avoid long-term high-frequency refresh and extended ultraviolet exposure. For this ESP32 E-Ink development kit, the recommended refresh interval is 15 seconds per refresh. Why choose CoreInk instead of an LCD controller? Choose M5Stack CoreInk when the project needs a display that remains readable between updates with lower power consumption than a continuously driven LCD. It is especially useful for electronic label, IoT terminal, and battery-powered information screens.
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