PS2 Keyboard Driver Module – Serial, UART, TWI/IIC, Parallel Output (Arduino AVR Compatible) Overview This PS2 keyboard driver module uses an onboard microcontroller to read keypress data from a standard PC PS2 keyboard and output the key values through multiple interfaces. It simplifies integration by eliminating the need for a keyboard driver in your main MCU system. Key Features Converts PS2 protocol to: TWI/IIC UART (Serial) Parallel interface Enhanced key state detection Supports simultaneous output via serial, parallel, and TWI/IIC Direct key data output without requiring additional driver development LED indicator flashes on key press Applications Robotics Electronic products Microcontroller-based systems Function Description The module reads PS2 keyboard input using a programmed MCU and outputs key scan codes through selected interfaces. Output options can be configured using a short-circuit cap. Example: Pressing the "A" key outputs: Serial: 0x1c Parallel (D7–D0): 0x1c TTL output behavior: No key pressed: 0 Key pressed: 1 Returns to 0 after key release Applies to all keys except the Pause key Working Principle The MCU continuously reads PS2 keyboard key states On key press: LED indicator flashes Key data is transmitted via: Serial communication Parallel I/O TWI/IIC (when enabled via short-circuit cap) Important Notes TWI/IIC address: 4 (module operates as slave) Remove the “IIC/TWI enable” short-circuit cap if TWI/IIC is not used; otherwise, the module may not function properly UART baud rate: 19200 If no device is connected to the IIC/TWI bus, the short-circuit cap must be removed Specifications Parameter Value Working Voltage DC 5V Communication Output Serial (19200 baud), Parallel, TWI/IIC Compatible Keyboard PC PS2 Keyboard Module Dimensions 39.1 × 31.2 × 18 mm Package Includes 1 × PS2 Keyboard Driver Module Serial Port Transmission Module
