Universal-Serial-Adapter

Hackable USB-C UART RS232 Adapter

The Universal Serial Adapter is an open-source hardware project designed to bridge USB-C, RS232, and TTL communication. This fully assembled adapter is packed with features tailored for advanced prototyping, embedded development, and system debugging.

Make one yourself or buy one here

Technical Summary

Key Features

• USB-C to RS232 Interface

  • USB-C (female) connector to DSUB9 RS232 (male) port.
  • Supports bidirectional communication between modern USB-C devices and RS232 hardware.

• TTL Signal Breakouts

  • TTL RX, TX, and control signal pins exposed for easy interfacing with UART-based systems.

• Signal Polarity Configuration

  • RS232 RX, TX, and control signals configurable using 2.54mm header jumpers:
    • Horizontal jumper placement: Straight connection.
    • Vertical jumper placement: Crossed connection.

• USB-C Line Breakouts

  • Access to USB-C data lines for advanced custom applications.

• 3.3V Linear Regulator

  • Integrated 3.3V linear regulator for powering external circuits.

Core Components

• WCH CH340G: USB-to-UART bridge IC for reliable USB communication.
• SP3243: TTL-to-RS232 transceiver IC for robust RS232 signaling.

Customization and Modifications

• Advanced features such as additional breakout options or alternate configurations may require soldering or cutting traces on the PCB.
• Preinstalled components include:
  • USB-C connector
  • DSUB9 RS232 connector
  • UART header
  • Configuration jumper blocks
• Open to further modification for specific use cases.

Open-Source Design

• Designed in KiCAD 8, with all source files available for inspection and modification.
• Licensed under an open-source hardware license, encouraging collaboration and adaptation.
• Repository includes:
  • KiCAD design files.
  • PCB layout and schematics.
  • Bill of Materials (BOM).

Applications

• Embedded system development.
• Debugging and diagnostics of RS232 hardware.
• Bridging modern USB-C devices to legacy RS232 systems.

Repository Contents

• /hardware/: KiCAD project files for the PCB.

Important Notes

• This adapter is a professional-grade tool and may require advanced soldering and modification skills for some features.
• Enclosures, cables, and other accessories are not included.

Get Started

Clone or download the repository to start customizing:

git clone https://github.com/AndersBNielsen/Universal-Serial-Adapter.git  

Getting a PCB

This project is kindly sponsored by JLCPCB. They offer cheap, professional looking PCBs and super fast delivery.

Step 1: Get the gerber file zip package from the /hardware folder

Step 2: Upload to JLCPCB https://jlcpcb.com

Step 3: Pick your color, surface finish and order.

If you want JLCPCB to assemble a board, the BOM and placement files are also in the repo.

You can use these affiliate links to get a board for $2 and also get $60 worth of New User Coupons at: https://jlcpcb.com/?from=Anders_N

And in case you also want to order a 3D-printed case you can use this link. How to Get a $7 3D Printing Coupon: https://jlc3dp.com/?from=Anders_N