● 17 min readShowdown: Uno R4 vs Uno R3 vs Nano
Welcome to Vol. 12 of The Probots Showdown. Three boards. Three price points. Three very different futures for your project.Should you stick with the
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Professional-grade CH341T bridge module. Seamlessly switch between USB-to-UART and USB-to-I2C modes with on-board jumpers. Ideal for EEPROM programming and sensor debugging.
Most USB-to-Serial converters do one thing and one thing only. But for the serious embedded engineer, toggling between debugging a UART console and scanning an I2C bus is a daily requirement. The CH341T 2-in-1 USB Converter eliminates the need for multiple dongles, providing a dedicated hardware bridge for both protocols in a single, compact footprint.
Unlike generic CH341A "Black Edition" programmers that often suffer from timing jitter and poor I2C clock stretching support, our module utilises the Probots ProSpec Grade CH341T variant. This specific silicon is optimised for 2-wire synchronous communication, ensuring your I2C sensor data remains uncorrupted even at 400kHz. Every unit is Probots Lab Verified in our facility to ensure the voltage selection jumpers provide clean, regulated power, making it Probots Logic-Safe for sensitive 3.3V microcontrollers, such as the ESP32 and STM32.
Chipset: CH341T.
USB Interface: USB 2.0 Full Speed (Standard Type-A).
UART Mode: Supports baud rates from 50bps to 2Mbps with a full-duplex hardware buffer.
I2C Mode: Master mode support with 4 selectable speeds (20K, 100K, 400K, 750K).
Operating Voltage: Dual 3.3V and 5V support (Jumper Selectable).
Indicators: Dedicated on-board LEDs for Power, UART activity, and I2C/SPI status.
Protection: Integrated 500mA self-recovery fuse to protect your PC's USB port.
Compatibility: Windows (7/8/10/11), Linux, and macOS.
EEPROM/Flash Programming: Read and write to 24-series I2C EEPROMs directly from your PC.
Sensor Debugging: Test I2C sensors (MPU6050, BME280, OLEDs) without writing a single line of MCU code.
Industrial Protocol Bridging: Convert legacy serial equipment to modern USB interfaces.
Automated Testing: Use Python or LabVIEW to control I2C peripherals during hardware-in-the-loop (HIL) testing.
Past Projects (Prerequisites): If you’ve used basic CP2102 or CH340 modules for simple serial logging, you’re ready for the next step.
Feature Upgrade: This module unlocks the ability to act as an I2C Master. This means you can "talk" to sensors directly from your computer terminal—a massive time-saver compared to uploading code to an Arduino every time you want to change a register.
Effort/Requirements: Intermediate. Requires basic knowledge of I2C addressing and driver installation.
⚠️ Safety Warning: Always set the voltage jumper (3.3V or 5V) before connecting your target device to prevent overvoltage damage.
| Pin Label | UART Mode Connection | I2C Mode Connection |
| VCC | 3.3V or 5V Power Out | 3.3V or 5V Power Out |
| GND | Ground | Ground |
| TXD / SDA | Connect to Target RX | Connect to Target SDA |
| RXD / SCL | Connect to Target TX | Connect to Target SCL |
Package Includes: 1 x CH341T USB to UART & I2C Serial 2-in-1 Converter Module
ch341 kernel driver.pySerial (UART) and smbus (I2C) are compatible.Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We delivery electronics components and parts throughout India using standard couriers like Bluedart, Delhivery & India Post.
For order related queries contact -
Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We offer specialized services for Bulk, Wholesale & B2B Customers like discounted prices, additional shipping options, customised products, etc . Customer with large quantity & regular orders qualify for the specialised discounted rates.
We also offer dedicated sales team to assist you with the order process by providing sales quotations, PI, technical support for choosing products, etc.
Note: Business Orders are processed manually and usually take 1-3 days to process compared to placing the order directly on our website. Please plan your purchases accordingly.
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Probots Electronics is highly regarded for its great selection of components and professional service. Customers frequently praise the awesome care and timely delivery provided by the team to ensure all products arrive safely.
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