M5Stack CardKB2 Keyboard Unit ESP32-C61HF4 42-Key Portable Keyboard 2.4GHz Wi-Fi 6 BLE I2C UART BLE HID ESP-NOW USB Type-C HY2.0-4P

SoC: ESP32-C61HF4 @ RISC-V 32-bit single-core, 120 MHz

Flash: 4MB

Wi-Fi: 2.4 GHz Wi-Fi 6

Keys: 42-key keyboard, 1 x Reset button, 1 x Boot button

USB Type-C: Power supply / firmware flashing, default firmware log output: 115200bps @ 8N1

RGB LED: 1 x RGB LED

Expansion Interface: 1 x HY2.0-4P

Standby Power: 5V@19.31mA (under Grove interface power supply conditions)

Product Size: 84.7 x 54.3 x 1.0mm

Product Weight: 22.4g

Introduction: 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.

1. Powered by ESP32-C61HF4 with RISC-V 32-bit single-core architecture at 120 MHz, supporting 2.4 GHz Wi-Fi 6 and BLE wireless communication.

2. Compact 42-key card-sized keyboard supports full input and multiple key combinations, including single press, Sym, and Fn operations.

3. Pre-installed firmware supports four communication modes: I2C, UART, BLE HID, and ESP-NOW for flexible configuration.

4. Equipped with 1 x HY2.0-4P expansion interface and USB Type-C port for power supply and firmware flashing.

5. Built-in RGB LED status indicator, Reset button, Boot button, and input power overvoltage protection for portable application use.

1 x Unit CardKB2

1 x HY2.0-4P Grove Cable (20cm)