🔶 FTDI USB-TTL Serial Adapter FT232RL — 3.3V / 5V UART Programmer for Arduino, ESP8266, ESP32

📦 Overview

Reliable FTDI-based USB-to-TTL serial adapter using the FT232RL chipset. Selectable 3.3V / 5V logic levels, breadboard-friendly pinout, stable drivers for Windows/macOS/Linux and ideal for programming, debugging and serial console access for microcontrollers (ESP8266, ESP32, AVR, STM32 and others). Compact, plug-and-play tool for makers, repair techs and production lines.

✅ Key Benefits

• FT232RL chipset — widely supported & stable
• Selectable 3.3V / 5V logic for ESP and Arduino compatibility
• USB plug-and-play with FTDI drivers (Windows, macOS, Linux)
• Breadboard and header friendly — TX / RX / VCC / GND / RTS / CTS where present
• Ideal for flashing firmware, serial debugging, & console access

⚙️ Specifications

• Chipset: FTDI FT232RL
• Interface: USB → TTL UART
• Logic Levels: Selectable 3.3V / 5V
• USB: USB 2.0 (Type-A cable to host)
• Supported OS: Windows / macOS / Linux (FTDI drivers)
• Typical Pins: TXD, RXD, VCC, GND (plus RTS/CTS on some boards)
• Condition: New

⚡ Quick How-To — Flash & Debug

1. Install FTDI drivers for your OS (if required).
2. Set logic level: move board jumper to 3.3V for ESP boards, or 5V for 5V Arduinos.
3. Wire adapter → target: TX → RX, RX → TX, GND → GND, VCC → 3.3V/5V (if powering target). Do not supply 5V to a 3.3V-only board.
4. Connect adapter to USB and select corresponding COM/TTY port in your IDE or tool (Arduino IDE, esptool.py, serial terminal).
5. Upload firmware, open serial monitor at the correct baud (often 115200), or use for console/debugging.

Important: Use a stable 3.3V regulator/power source when powering ESP modules. When in doubt, power target from its own supply and connect only TX/RX/GND for serial.

🔌 Wiring (ASCII)

FTDI Adapter        Target Module
-----------         ----------------
TX  --------------> RX
RX  --------------> TX
GND --------------> GND
VCC --------------> VCC (3.3V or 5V if powering target)
(Optional) RTS/CTS -> RTS/CTS (flow control if used)

💡 Possible Uses

• Flashing firmware to ESP8266 / ESP32 / ESP-01 modules
• Uploading sketches to Arduino boards without onboard USB
• Serial console access for debugging and logs
• Bootloader programming and firmware recovery
• Development bench tool for embedded projects and testing

🛠️ Commands & Troubleshooting (Collapsible)

# Example: list serial ports (Linux/macOS)
ls /dev/tty.*   # macOS
ls /dev/ttyUSB* /dev/ttyACM*  # Linux

# Flash ESP8266 with esptool.py (example)
esptool.py --port /dev/ttyUSB0 write_flash 0x00000 firmware.bin

# Common fixes:
# - No COM port: install FTDI drivers and replug USB
# - Can't flash ESP: ensure GPIO0 is LOW for flash mode (ESP8266) and correct power level (3.3V)
# - Strange chars in serial monitor: set correct baud rate (try 115200)
  

📦 Package Includes

• 1 × FTDI USB-TTL Serial Adapter (FT232RL)

📝 Recommended eBay Item Title

FTDI USB-TTL Serial Adapter FT232RL — 3.3V/5V UART Programmer for Arduino ESP8266 ESP32

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