While FM radio technology has evolved significantly, most modern implementations still rely on bulky modules or external devices, limiting true wearability. Creating an ultra-compact, fully functional FM radio that is both portable and intuitive to use—without sacrificing usability—remains a key design challenge.
Key Features
- Ultra-compact, watch-style wearable FM radio design
- Built using the IndusBoard Coin V2 (3cm diameter)
- 3cm round GC9A01 LCD with capacitive touch interface
- CST816S touch driver for intuitive touch control
- RDA5807M FM stereo radio module
- Touch-based UI with play/pause, next, and previous controls
- Smooth frequency tuning from 87.5MHz to 108.0MHz
- Stereo audio output via earphones or amplified speakers
- Powered by a 3.7V Li-Po battery for portability
- Modular design supporting future FPC-based expansions
Applications
- Wearable electronics and compact gadget prototyping
- DIY FM radio and RF experimentation
- Educational projects on embedded UI and touch interfaces
- Ultra-portable audio devices
- Proof-of-concept for miniaturised consumer electronics
- Foundation for earbud-sized FM radio designs
This watch-style wearable FM radio demonstrates how classic communication technology can be reimagined in an ultra-compact, modern form. By combining touch interaction, stereo FM reception, and a highly integrated design, the project pushes the boundaries of miniaturisation. It also sets the stage for the next evolution—an even smaller FM radio designed to fit entirely within an earbud, which will be explored in the upcoming article.