Description
The Adafruit CH9328 UART to HID Keyboard Breakout enables you to emulate an HID keyboard using a standard UART serial connection. This chip acts as a programmed microcontroller that appears as an everyday HID keyboard, converting ASCII or 8-byte raw reports received via UART into keypresses. This breakout board is ideal for use with microcontrollers or single-board computers that lack native USB support, such as classic ATmega328 Uno, original ESP32, ESP8266, or even Raspberry Pi.
The breakout features a USB Type-C port for easy connection to computers, laptops, phones, or tablets, along with pads for 5V power and ground. It includes a UART RX receive input and a reset line to perform hard resets. The board offers four onboard mode switches to configure how input data is interpreted and sent as keystrokes.
Key features:
- Emulates USB HID keyboard from UART input
- Compatible with microcontrollers without native USB
- USB Type-C connector for easy connection
- Configurable operating modes via onboard switches
- Supports ASCII and raw 8-byte HID reports
- Includes support circuitry; soldering may not be necessary
Modes can be set using the onboard switches before powering the device, allowing options such as sending visible ASCII characters as-is, converting special keys like Enter, or sending raw HID reports for full control. Mode 3 is recommended for advanced usage with the CH9328 library.
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