Project Hub /Audio Displays & Interactive Media/LED Matrix & Cube Displays/USB To Serial TTL Converter With USB Type C Connector

Intermediate

ANALOG / DISCRETE

< ₹500

3 – 6 Hours

Partial Kit

USB To Serial TTL Converter With USB Type C Connector

A compact USB to Serial TTL converter featuring a modern USB Type-C connector and the CP2102N IC, designed using KiCad.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

10pcs 5mm RED Diffused Light Emitting Diodes - LEDs Set Rs. 39.00
10pcs - 220 ohm 1/4 W Resistor Set Rs. 39.00
USB to UART/ESP8266 Adapter Programmer for ESP-01 WiFi Modules with CH340G Chip Rs. 99.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

This list includes a generic resistor set as a placeholder — it is not matched to the exact value or part number this circuit needs. The correct one is specified on the original source page linked above; check it before buying.

We don't carry yet: Capacitors
Diodes (1N4007 / 1N4148 / Schottky / Zener)
Header Pins / Terminals / Connectors
Inductors / Coils / Ferrite
Custom PCB / PCB Fab

Browse all components

How It Works

The USB to Serial TTL Converter bridges standard USB communication from a host computer with asynchronous serial logic used by embedded microcontrollers. At the heart of the design is the CP2102N-Axx-xQFN20 integrated circuit, which handles the complex USB protocol translation internally, converting differential USB data streams into single-ended Transistor-Transistor Logic (TTL) serial signals. Physical connectivity to the host is established via a modern USB Type-C connector (USB4105GFA120). To ensure robust electrical operation, the circuit integrates supporting passives including resistors, capacitors, and an inductor for power filtering and signal integrity, while an SM712 ESD protection diode safeguards the data lines from electrostatic discharge events. Power and serial data lines (such as TX and RX) are routed to a right-angle male header, allowing engineers and students to easily interface the converter with target microcontroller boards using jumper wires. The entire hardware schematic and layout are engineered using KiCad, providing a reliable printed circuit board platform for debugging, programming, and data logging tasks.

Why Build This

Bridge modern USB Type-C hosts with legacy TTL serial interfaces on development boards and custom microcontroller prototypes.

Perform real-time serial debugging, firmware flashing, and data logging for undergraduate engineering lab projects and embedded systems design.

Gain hands-on experience designing and fabricating custom interface hardware complete with ESD protection and surface-mount components using KiCad.

Real-World Application

Prototyping, debugging microcontrollers, firmware flashing, and serial data logging in embedded systems.

Skills You'll Learn

USB-to-UART bridge integration

surface-mount device soldering

schematic capture and PCB layout in KiCad

electrostatic discharge (ESD) protection circuit design

asynchronous serial communication configuration

Safety Precautions

Ensure correct orientation and soldering of the USB Type-C connector and ESD protection diodes to prevent short circuits.

Technology Tags

USB

SERIAL COMMUNICATION

TTL

USB TYPE-C

KICAD

PCB DESIGN

CP2102N

ESD PROTECTION

Frequently Asked Questions

Why use a USB Type-C connector instead of a traditional USB-A or USB-Mini connector?

The USB Type-C connector offers a modern, reversible physical interface capable of handling robust data transfer and power delivery, making the converter compatible with current computer hardware without requiring legacy adapters.

What is the role of the CP2102N IC in this circuit?

The CP2102N acts as a USB-to-UART bridge controller, translating the USB protocol from your computer into asynchronous serial TTL data that microcontrollers can understand.

Do I need to install special software to use this converter?

While the hardware is designed in KiCad 7.0.8, operating the physical module on your computer typically requires standard virtual COM port (VCP) drivers provided by Silicon Labs so the host operating system can communicate with the CP2102N.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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