FT232RL USB TO UART TTL 5V 3.3V Adapter Module For Arduino

USB to UART TTL FT232RL Adapter Module

The USB to UART TTL FT232RL Adapter Module is a compact and reliable USB-to-serial communication module designed for connecting Arduino boards, microcontrollers, development boards, and other TTL-based devices to a computer. Built around the FTDI FT232RL IC (Revision 2), it provides stable and reliable serial communication for programming, debugging, firmware flashing, and data transfer.

The module supports both 3.3V and 5V logic levels, making it suitable for a wide range of embedded systems and microcontroller platforms. Its DTR pin supports automatic reset, which is especially useful when programming boards such as the Arduino Pro Mini, allowing the connected board to reset automatically during code uploading.

The module uses a Mini USB interface and follows a standard FTDI-style pinout for convenient integration. Clearly marked BLK (GND) and GRN (CTS) pins help users correctly align the module with compatible FTDI cables and development boards.

With its compact 36mm × 18mm form factor and up to 500mA current output, this adapter is a useful tool for electronics development, robotics, embedded programming, and serial communication applications.

Features

• USB to UART TTL serial adapter module
• Built around the FTDI FT232RL IC (Rev. 2)
• Supports reliable USB-to-TTL serial communication
• Supports 3.3V and 5V operation
• Selectable 3.3V and 5V logic levels
• DTR pin for automatic reset
• Useful for Arduino Pro Mini programming
• Mini USB interface
• Standard FTDI-style pinout
• Clearly labelled connection pins
• BLK and GRN pin identification
• Up to 500mA maximum current
• Compact and lightweight design
• Suitable for embedded development
• Useful for UART debugging and firmware flashing
• Suitable for robotics and electronics projects
• Ideal for DIY and prototyping applications

Specifications

Parameter	Specification
Product Type	USB to UART TTL FT232RL Adapter Module
USB-to-Serial IC	FT232RL
IC Revision	Rev. 2
Interface	Mini USB
Operating Voltage	3.3V / 5V
Logic Level	3.3V / 5V
Maximum Current	500mA
Reset Feature	DTR Auto Reset
Pinout	FTDI Compatible
Dimensions	36mm × 18mm
Country of Origin	China

Design and Construction

The USB to UART TTL FT232RL Adapter Module features a compact PCB design intended for easy integration into electronics and embedded-system projects. The board uses the FT232RL USB-to-UART interface IC to convert USB signals from a computer into TTL-level serial signals that can be understood by compatible microcontrollers.

The module provides clearly marked connection pins to simplify wiring. Its 3.3V and 5V support provides flexibility when working with different development boards and logic-level requirements.

The integrated DTR connection allows compatible boards to perform an automatic reset during programming. This makes the module particularly convenient for boards such as the Arduino Pro Mini and other systems that use serial bootloaders.

Its compact 36mm × 18mm size makes it suitable for development boards, robotics projects, embedded systems, and portable prototypes.

Pinout and Connections

The module follows a standard FTDI-style pin configuration for convenient connection to compatible development boards.

Typical connections include:

• VCC – Power supply
• GND / BLK – Ground
• TXD – UART transmit
• RXD – UART receive
• DTR – Automatic reset control
• CTS / GRN – Clear-to-send connection

Always verify the pinout and voltage requirements of the target device before making connections.

Working Principle

The FT232RL Adapter Module acts as a bridge between a computer’s USB interface and a microcontroller’s TTL UART interface.

When connected to a computer through the Mini USB port, the FT232RL converts USB data into UART serial data. The TXD and RXD pins then communicate with the connected microcontroller or embedded device.

During programming, the DTR pin can provide an automatic reset signal to compatible boards. This allows the bootloader to start automatically when code is uploaded, eliminating the need to manually press the reset button in supported applications.

The module can also be used for receiving serial data from microcontrollers and displaying or logging that data on a computer.

Applications

• Arduino Pro Mini programming
• Arduino and compatible board programming
• Microcontroller programming
• UART debugging
• Serial communication
• Firmware flashing
• Embedded system development
• GPS module interfacing
• GSM module interfacing
• Sensor module communication
• ESP and other TTL UART devices
• Robotics projects
• DIY electronics projects
• Serial terminal communication
• Embedded-system prototyping
• Development and testing
• Computer-to-microcontroller communication

Package Includes

• 1 × USB to UART TTL FT232RL Adapter Module

Product Disclaimer

Product images are shown for illustrative and representational purposes only. The actual product may vary slightly in colour, component placement, PCB markings, dimensions, or overall appearance depending on the manufacturing batch.

USB cable, Arduino board, microcontroller, sensors, and other components shown in product images are not included unless specifically mentioned in the package contents.

Before connecting the module, verify the required logic voltage and pin configuration of your target device to prevent possible damage.