What is it? A compact USB-C to TTL UART adapter based on the proven CH340. Ideal for programming and serial debugging on Arduino, ESP8266/ESP32, STM32, and other MCU boards.

Why this instead of a generic dongle?

• USB-C convenience, no more micro-USB cables.
• Stable CH340 driver support on major OSes.
• Small, durable form factor that fits on a crowded bench.
• TX/RX LEDs for quick activity checks.
• DTR/RST pin for auto-reset on Arduino/ESP uploads.

Why did you make it? I wanted a simple, reliable tool for my own projects that works with modern laptops without needing bulky adapters or outdated cables. Many existing converters are still stuck on micro-USB, so I designed one with USB-C for convenience and better compatibility.

What makes it special? This adapter is plug-and-play on most systems, supports stable data transfer, and comes in a small, durable form factor. The USB-C port makes it future-proof, and the CH340 ensures it works seamlessly with popular development boards. Perfect for hobbyists, makers, and anyone working with serial devices.

Info

• Chipset: CH340 family
• USB: USB-C receptacle
• Logic level: 5V, Also has 3.3V Output
• I/O pins exposed: 5V, 3.3V, GND, TX, RX, DTR
• Baud rates: Common UART speeds
• Indicators: Power, TX, RX LEDs
• Dimensions: 20 mm × 15 mm × 5 mm

• Compatibility: Arduino, ESP8266/ESP32, STM32, Raspberry Pi (serial), etc.

• What's included: 1x USB-C to TTL UART board

• Optional: 1x 6-pin header, FREE of choice