CW-Trainer-Adapter is a small USB interface that connects your Morse key (straight or iambic) to your computer or mobile device.

It uses a CH340 USB-to-Serial converter and the DSR / CTS pins to detect key presses, allowing full compatibility with most CW Trainer and Morse practice software.

This board lets you train Morse code comfortably on PC or Android (via USB OTG), without needing a full transceiver.

Just plug your paddle or straight key into the 3.5mm jack, connect it via USB, and start practicing CW anywhere!

Key Features:

• Based on CH340 USB-to-Serial interface
• 3.5mm jack input for straight or iambic CW keys
• Uses DSR and CTS pins for paddle detection
• Plug & Play, no external power required
• Works with CW Trainer / Morse programs
• OTG compatible for mobile devices
• Compact and portable design

This open-source project is created and shared by Uğur Altınsoy to make CW practice simple and accessible for everyone.

🔗 GitHub: https://github.com/Deeplab-Studio/CW-Trainer-Adapter