CardKB2 Keyboard Unit (ESP32-C61)

Description

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.

Features

• Powered by ESP32-C61HF4 with Wi-Fi 6 / BLE wireless communication support
• Full keyboard input with support for multiple key combinations (single press, Sym, Fn)
• Onboard RGB LED (XL-1615RGBC-RF) for keyboard status indication
• Power Supply:
  • USB Type-C
  • DC 5V

Includes

• 1 x Unit CardKB2
• 1 x HY2.0-4P Grove Cable (20cm)

Applications

• Text input for portable devices
• Human-machine interaction in embedded systems
• Wireless control terminal for IoT devices
• Educational programming and maker projects

Specifications