(U215)Unit CardKB2

CardKB2 Keyboard Unit (ESP32-C61)

SKU : U215
Shop : https://shop.m5stack.com/products/cardkb2-keyboard-unit-esp32-c61?ref=langship
Document : https://docs.m5stack.com/en/unit/Unit_CardKB2
Release Date(probably) : 2026-04-03

Unit CardKB2 is a card-sized 42-key portable keyboard input unit. Its compact and lightweight form factor makes it ideal for on-the-go use and embedded integration. Powered by an ESP32-C61HF4 MCU with built-in 2.4 GHz Wi-Fi 6 support, the pre-installed firmware allows flexible configuration across four communication modes: I2C, UART, BLE HID, and ESP-NOW. The unit features an onboard HY2.0-4P expansion interface and a USB Type-C port for power supply and firmware flashing. Additional hardware includes an RGB LED status indicator, a reset button, and a Boot button. Input power overvoltage protection is also integrated, making this unit well-suited for wireless input, interactive control, and a wide range of portable application scenarios.

Datasheet

Unit CardKB2 User Manual & Registers : Unit_CardKB2_User_Manual_EN.pdf
Unit CardKB2 Schematics PDF : Unit_CardKB2.pdf
Unit CardKB2 Model Size PDF : U215-Unit_CardKB2_Dimension_Diagram.pdf
ESP32-C61HF4 : esp32-c61_datasheet_en.pdf
Unit CardKB2 User Manual & Registers : Unit_CardKB2_User_Manual_EN.pdf