BLE IoT Device – BT840X Based

This project showcases the design of a battery-powered IoT device built around the Fanstel BT840X module, which integrates the Nordic nRF52840 SoC with Bluetooth 5.0 capabilities. The board was designed for low-power operation, rechargeable over USB-C, and supports external connectivity through an 8-pin interface for switches and peripherals. With its compact and modular design, the device can be adapted for a variety of IoT applications such as wearables, smart sensors, and portable controllers.

Key Features

• Fanstel BT840X Module (nRF52840 SoC) providing BLE 5.0 connectivity.
• Battery-Powered Design with integrated USB-C charging.
• 8-Pin Connector for attaching external switches, sensors, or custom peripherals.
• Low-Power Operation suitable for portable and continuous IoT use cases.
• Compact PCB Layout optimized for manufacturability and modularity.

My Contribution

• Designed the schematic and PCB layout in Altium Designer, ensuring optimized RF performance and stable power delivery.
• Implemented battery management and USB-C charging circuitry for reliable portable operation.
• Integrated an 8-pin peripheral connector to provide flexible I/O options.
• Oversaw the fabrication and assembly of prototypes and carried out functional testing.
• Documented system behavior and validated wireless performance in real-world testing.

Learning Outcome

This project expanded my expertise in BLE-based IoT hardware design, battery management systems, and modular peripheral interfacing. It also highlighted my ability to design compact, power-efficient systems ready for integration into real-world IoT solutions.