2 layers57.3 × 12 mm
USB to UART
adaptableCoder/USB-to-UART-CH340g-PCB
PCB design for USB-to-UART converter based on CH340G with a USB-A edge connector.
28 parts2MIT
2 layers52.3 × 12 mm
UARTStick
hardik1975/UARTStick2Say hello to UART Stick — a micro-sized, Arduino-compatible USB to UART converter designed for makers, tinkerers, and embedded developers.
- Size
- 52.3 × 12 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 25
- Nets
- 24
- Pads
- 70
- Tracks, vias
- 159, 29
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 8 Jun 2025
- Updated
- 11 Jun 2025
Overview
UARTStick is an open-source printed circuit board by hardik1975, from the hardik1975/UARTStick repository on GitHub. It is a 2-layer board of 52.3 × 12 mm with 25 parts on 24 nets, routed with 159 tracks and 29 vias.
It is built around the CH340G, SPX3819M5-L-3-3 and USBLC6-2SC6. Its parts include 6 capacitors, 3 resistors, 3 ICs, 3 diodes and 2 connectors.
Main components
3
CH340G
SOP-16-40℃~+85℃ 2Mbps 3.3V、5V USB 2.0 USB to UART SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
SPX3819M5-L-3-3
SOT-23-5-40℃~+85℃@(Ta) 1 20V 3.3V 420mV@(100mA) 500mA 5uA 70dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
README
readme.md
UART Stick
Overview
Say hello to UART Stick — a micro-sized, Arduino-compatible USB to UART converter designed for makers, tinkerers, and embedded developers.
Unlike bulky boards, UART Stick is tiny, hassle-free, and packed with all the essential features you need to program your microcontrollers or read serial data — all while fitting directly into your USB port.
🛒 Get Yours
Fill out the Order Form to grab your UART Stick today!
Choose from two versions:
-
DIY Kit – Includes a bare PCB, CH340G IC, resistor, capacitor, ESD diode, and USB connector.
A great choice for learning and hands-on soldering practice! -
Fully Assembled – Ready to use out of the box. Just plug it into your USB port and start programming!
Perfect for makers, students, and embedded devs — just plug and start building!
Features
- Compact Design – As small as a USB plug, perfect for on-the-go prototyping.
- No Wires Needed – Built-in USB edge connector for direct plug-and-play.
- CH340G Based – Reliable and widely supported USB-to-Serial IC.
- Open Source – Always will be. Hack it, mod it, or build your own.
- Arduino-Compatible – Program boards via Arduino IDE effortlessly.
- On-Board LEDs – Power, RX, and TX LEDs for easier debugging and status indication.
Specifications
| Parameter | Value |
|---|---|
| IC | CH340G |
| USB Connector | Edge-mounted USB-A |
| Operating Voltage | 5V |
| Logic Level | 3.3V or 5V |
| Board Size | 52.25mm x 12mm |
Getting Started
What You’ll Need
- Arduino IDE (or any serial monitor)
- UART Stick
- USB port
- Jumper Wires
Steps to Use
-
Connect to Your Target Device
Wire the UART Stick to your microcontroller or module as follows:UART Stick Pin Target Device VCC 3.3V or 5V RX TX TX RX GND GND -
Plug in the UART Stick
Insert it directly into your computer’s USB port — no cables needed thanks to the edge USB connector. -
Select the Correct COM Port
Select correct COM port in Arduino IDE or your preferred serial tool. -
Start Communicating
- Upload code to your microcontroller
- Or monitor serial data
- Or send/receive commands
🔧 Use Cases
Here’s how UART Stick fits into your daily prototyping and debugging workflow:
-
Flashing Firmware
Upload code to microcontrollers like Arduino, ESP32, STM32, or ATmega-based boards with ease. -
Debugging Sensors & Modules
View real-time data or debug sensor output via Serial Monitor. -
Reading BLE Data
Communicate with BLE modules like HM-10 or HC-05/06 to send and receive wireless serial data. -
General UART Communication
Interface with any device that speaks UART — from GPS modules to embedded Linux boards (like Raspberry Pi’s UART GPIOs). -
Serial Console Access
Open terminal access to headless boards or dev kits, especially useful for bootloaders, Linux boards, or ESPs in flashing mode. -
Part of Your Embedded Toolbox
A reliable companion for DIY projects, robotics, IoT devices, and lab debugging tasks.
Contact
Made with ❤️ by Hardik
Have questions, feedback, or cool project ideas using the UART Stick?
We’d love to hear from you!
Join Our WhatsApp Group 💬
Are you a maker, tinkerer, or electronics enthusiast?
Join our WhatsApp group to connect with like-minded people, share projects, get support, and behind the scenes!
👉 Click here to join the Community
📚 References
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | CTS, DCD, DSR, DTR, RI, RTS |
| 3 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C6 |
| 2 | 22pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5 |
| 1 | 10nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3 |
| 1 | CH340G | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Horizontal | J3 |
| 1 | HC-49_U-S16000000ABJB | HC-49 U-S16000000ABJB:XTAL_HC49P488W43L1150T466H350 | Y2 |
| 1 | Jumper_3_Open | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | Power Led | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3 |
| 1 | Rx_LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
| 1 | SPX3819M5-L-3-3 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | Tx_LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | USB_A_PCB_Edge_receptacle | Connector_USB_PCB_Edge:USB_A_PCB_Edge_receptacle | J5 |
Questions
How big is the UARTStick PCB?
It measures 52.3 × 12 mm and has 2 copper layers, 1.6 mm thick.
What parts does the UARTStick use?
25 parts, built around the CH340G, SPX3819M5-L-3-3 and USBLC6-2SC6. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the UARTStick KiCad files?
From the hardik1975/UARTStick repository on GitHub, at the commit this page was made from: the board is UART Stick.kicad_pcb and its schematic UART Stick.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the UARTStick design in my own project?
Its repository states no licence, so its author keeps all rights: ask hardik1975 before reusing the design.
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