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Product description: CardKB2 - miniature keyboard with ESP32-C61HF4 - Unit expansion module for M5Stack development modules
The CardKB2 is a compact, card-format, portable keyboard from the Unit series , featuring 42 keys and designed for embedded projects, mobile devices, and human-machine interaction systems. Its small size and weight of just 22.4g make it easy to integrate into your own device, control terminal, IoT project, or educational development kit. At its heart is the ESP32-C61HF4 chip with a 32-bit RISC-V core clocked at 120MHz. The keyboard supports 2.4GHz WiFi 6 and BLE wireless connectivity, and the pre-installed software allows for four communication modes: I2C, UART, BLE HID, and ESP-NOW. The board also includes an HY2.0-4P expansion interface, a USB Type-C port for power and firmware programming, an RGB status LED , a Reset button, and a Boot button.
CardKB2 - miniature keyboard with ESP32-C61HF4 - Unit expansion module for M5Stack development modules. 
CardKB2 is a compact, card-format portable keyboard from the Unit series, equipped with 42 keys and designed for embedded projects, mobile devices and human-machine interaction systems.Special features
- Compact 42-key keyboard: the module enables convenient text and command entry in portable and embedded projects
- ESP32-C61HF4: 32-bit 120MHz RISC-V processor provides communication and keyboard logic
- WiFi 6 and BLE connectivity: wireless communication support makes it easy to create mobile control terminals
- Four communication modes: I2C, UART, BLE HID and ESP-NOW support allows the module to be adapted to various applications
- Support for key combinations: the keyboard supports single presses and combinations with the Sym and Fn keys
- RGB status LED : built-in XL-1615RGBC-RF LED allows you to signal the device's operating status
- USB Type-C port: used for power supply, firmware upload and default log output
- HY2.0-4P interface: allows quick connection of the module to compatible Grove systems
- Power input protection: integrated overvoltage protection increases module operational safety
Technical specifications
- Number of keys: 42
- SoC: ESP32-C61HF4
- Processor: RISC-V 32-bit, single-core, 120 MHz
- Flash memory: 4 MB
- Wireless connectivity: 2.4 GHz WiFi 6, BLE
- Communication modes: I2C, UART, BLE HID, ESP-NOW
- Additional buttons: Reset, Boot
- Status LED: 1x RGB LED XL-1615RGBC-RF
- Expansion interface: 1x HY2.0-4P
- USB port: USB Type-C
- USB Type-C port functions: power supply, firmware upload, default log output
- Default firmware log parameters: 115200 bps, 8N1
- Power supply: 5V DC via USB Type-C or HY2.0-4P interface
- Standby current consumption: 5V/19.31mA when powered via Grove interface
- Weight: 22.4 g
- Dimensions: 84.7 x 54.3 x 1 mm
Kit contents
- Unit CardKB2
- HY2.0-4P Grove Cable 20 cm
The heart of the module is the ESP32-C61HF4 chip with a 32-bit RISC-V core clocked at 120 MHz.
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