Glunova Biotech

USB to UART Serial Adapter CH340, 5V and 3.3V Selectable, for Arduino, ESP8266, ESP32, STM32 and Raspberry Pi Console

Name: USB to UART Serial Adapter CH340, 5V and 3.3V Selectable, for Arduino, ESP8266, ESP32, STM32 and Raspberry Pi Console
Brand: Glunova Biotech
SKU: SEEED-103990049
Price: 23.0 SGD
Availability: InStock

$23.00 SGD

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The USB to UART 5V/3V3 adapter is a CH340-based USB-to-TTL serial converter that lets a Windows, Linux or macOS computer talk to microcontrollers and single-board computers over a UART, used for uploading code to Arduino Pro Mini boards, flashing ESP8266 and ESP32 modules, accessing STM32 bootloaders and opening a serial console on a Raspberry Pi.

A compact USB-to-TTL serial bridge built on the widely supported CH340 chip. Switch between 5 V and 3.3 V logic to program Arduino Pro Mini boards, flash ESP8266 and ESP32 modules, talk to STM32 bootloaders or open a serial console on a Raspberry Pi. Drivers are built into modern Linux and macOS and are a one-click install on Windows.

What can you use it for?

Programming Arduino Pro Mini, Pro Micro-style and other boards without a USB port
Flashing firmware to ESP8266, ESP-01 and ESP32 modules
Serial console access to a Raspberry Pi, router, OpenWrt device or Linux board
Debug logging from STM32, PIC, AVR and RISC-V microcontrollers
Connecting GPS modules, Bluetooth serial modules and sensors with a UART to a PC

Who is it for?

Anyone who develops or repairs microcontroller hardware and needs a reliable, driver-friendly serial link that can switch between 5 V and 3.3 V targets.

Compatibility

Operating systems: Windows (CH340 driver), Linux (built-in ch341 driver), macOS 10.14+ (built-in)
Targets: 3.3 V and 5 V microcontrollers; select the level before connecting
Tools: Arduino IDE, PlatformIO, esptool, STM32CubeProgrammer, PuTTY, screen, minicom

Specifications

Chipset	WCH CH340 USB-to-serial bridge
USB	Full-speed USB 2.0 device
Logic levels	3.3 V and 5 V selectable I/O
Baud rate	2,400 – 115,200 bps
Interface	Hardware full-duplex UART (TX, RX, VCC, GND) with transceiver buffer
Indicators	LED activity indicator
Power	DC 5 V from USB, < 10 mA
Operating systems	Windows, Linux, macOS (CH340 driver)
Weight	4 g

What's in the box

Default Title: 1 × USB to UART 5V/3V3 adapter

Frequently asked questions

Is the CH340 as good as an FTDI adapter?

For everyday programming and serial consoles up to 115200 baud, yes. The CH340 is fully supported by Arduino IDE, esptool and modern operating systems, and it costs a fraction of an FTDI cable.

How do I switch between 5 V and 3.3 V?

Use the level selector on the board to match your target. Set 3.3 V for ESP8266, ESP32, STM32 and Raspberry Pi; set 5 V for classic 5 V Arduino boards.

Can it flash an ESP8266 or ESP32?

Yes. Connect TX to the module's RX, RX to TX and GND to GND, hold the module's boot pin low while resetting, then use esptool or the Arduino IDE. Power heavier modules from a separate 3.3 V supply.