# USB to TTL UART FT232RL programmer

> USB to TTL UART adapter with FT232RL chip, used for programming boards such as Arduino Pro Mini and serial communication with microcontrollers. Features a jumper to select 3.3 V or 5 V logic level, USB power, RXD/TXD indicators, and TX, RX, VCC, GND, DTR, CTS pins. Dimensions: 34 x 16mm. Reference: 33291.

- Page: https://sigmanortec.ro/en/usb-to-ttl-uart-ft232rl-programmer
- Price: 12.72 RON
- Availability: In stock; 1-2 zile
- Reference: 33291 · EAN: 5947026237582
- Category: Mechatronics and IoT > Programming
- Package (shipping data): 0.004 kg
- Updated: 2026-09-23
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-21 20:59 (Europe/Bucharest)

## Description

USB to TTL UART adapter with FT232RL, ideal for fast programming of Pro Mini boards and stable serial communication with microcontrollers. Includes jumper for selecting 3.3V or 5V logic level, plug and play connection via USB, standard pins for TX RX VCC GND, compact construction suitable for test and development bench.
The FT232RL USB to TTL Serial adapter module is a reliable and practical solution for programming and communication with development boards, microcontrollers, and embedded systems.
This converter transforms the USB signal into a TTL serial signal, making it ideal for Arduino Pro Mini, UART projects, and applications for debugging or data transfer.
The module uses the FT232RL chip, known for stability and safe operation, and all signal ports operate at TTL or CMOS levels. It features indicators for RXD and TXD communication, direct power supply via USB, and the ability to select a 5 V or 3.3 V interface, making it compatible with a wide range of electronic equipment.
Due to its compact size and simple use, this module is very suitable for both developers and electronics enthusiasts.
Specifications:
Main chip: FT232RL
Product type: USB to TTL serial adapter
Signal level: TTL / CMOS
Interface voltage: 5 V or 3.3 V
Power supply: via USB
Communication indicators: RXD / TXD
Main use: programming, debugging, and serial communication
Compatibility: Arduino Pro Mini, microcontrollers, embedded systems
Connectors: USB interface and serial pins
Function: USB to UART TTL conversion
Dimensions: 34 x 16mm
Pinout:
Pin
Function
Description
DTR
Data Terminal Ready
Commonly used for auto reset when programming compatible boards
RX
Receive Data
Receives data from the connected device
TX
Transmit Data
Transmits data to the connected device
VCC
Power supply
Power voltage for the target board, depending on setting 3.3 V or 5 V
CTS
Clear To Send
Control signal for serial communication
GND
Ground
Common ground reference
Usage:
Connect the module to the computer via the USB port, then connect the TX, RX, VCC, and GND pins to the target board according to the correct wiring diagram. Select the appropriate voltage, 3.3 V or 5 V, depending on the requirements of the connected device.
The module can be used for firmware uploading, serial communication, testing, and data monitoring. For correct operation, check the correspondence of the TX and RX pins and avoid powering with an unsuitable voltage.
Instructions
Example connection of FT232RL with Arduino Pro Mini:
To connect the FT232RL module to an Arduino Pro Mini, it is important to correctly connect the communication and power pins. TX and RX are connected crossed, and the DTR pin is used for automatic reset during sketch uploading.
Voltage caution:
Pro Mini 5 V version: set the module to 5 V.
Pro Mini 3.3 V version: set the module to 3.3 V.
FT232RL
Pro Mini
TX
RX
TX
VCC
GND
DTR