Waveshare
USB to TTL 4-pin Wire
A USB to TTL serial adapter cable with an embedded PL2303 converter chip. This 1-metre cable provides a simple way to add serial communication to your projec...
A USB to TTL serial adapter cable with an embedded PL2303 converter chip. This 1-metre cable provides a simple way to add serial communication to your projects, connecting a standard USB-A port to 3.3V TTL-level UART signals via a 4-pin 2.54mm header.
Ideal for accessing serial consoles on single-board computers like Raspberry Pi, debugging microcontrollers, or communicating with any device that uses TTL-level serial.
Key Features
- PL2303 Converter Chip – Reliable USB to UART bridge with wide OS support
- 3.3V TTL Logic – TX and RX lines operate at 3.3V, safe for modern microcontrollers
- 5V Power Output – VCC pin provides 5V from USB for powering target devices
- 2.54mm Pin Header – Standard pitch for easy breadboard and header connections
- 1m Cable Length – Generous length for comfortable bench use
Pinout
- Red – VCC (5V)
- Black – GND
- Green – TXD (3.3V TTL, connects to target RXD)
- White – RXD (3.3V TTL, connects to target TXD)
Compatibility
- Windows XP, 7, 8, 8.1, 10 and later
- macOS and Linux (driver support may vary)
Ideal For
- Raspberry Pi and single-board computer serial consoles
- Microcontroller UART debugging and programming
- Serial communication with GPS modules, sensors, and other TTL devices
- Embedded system development and diagnostics
Package Contents
- 1× USB to TTL 4-pin serial cable (1m)
Jargon buster
Plain-language definitions for the technical terms used above.
- 3.3V TTL
- 3.3V TTL means the serial logic signals use 3.3 volt levels rather than 5 volts. This matters because connecting it directly to a 5V-only signal can damage the module or cause unreliable communication unless level shifting is used.
- GPS
- The US satellite navigation system used by GNSS receivers to calculate position and time. Support for GPS is important because it is widely available and often used together with other constellations for more reliable positioning.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- RS-232
- An older serial communication standard that uses higher signal voltages than modern microcontroller logic pins. If you are connecting this breakout to a microcontroller, you may need an RS-232 interface or level converter rather than wiring it directly.
- single-board computer
- A complete computer built onto one circuit board, usually including the processor, memory, ports, and connectors. This matters because accessories like heatsinks must match the board’s layout and mounting holes to fit properly.
- TTL serial
- A simple serial data connection that uses microcontroller logic-level signals rather than computer RS-232 voltage levels. It matters because the camera can connect directly to many microcontroller pins or a USB-to-TTL serial adapter, but not safely to an old-style RS-232 port without conversion.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
Find this product in
Prototyping & Wiring
Related Tutorials
Free guides on learn.littlebird.com.au
