JDY-31 SPP-C Bluetooth Serial Pass-Through Module

Upgrade your wireless serial communication setup with the JDY-31 SPP-C Bluetooth Serial Pass-Through Module. Designed as a reliable drop-in replacement for the HC-05, this compact module enables seamless wireless serial data transmission between microcontrollers, development boards, and other UART-enabled devices — no wires, no clutter.

Why Choose the JDY-31 SPP-C?

Wireless Serial Communication: Transmits serial data over Bluetooth SPP (Serial Port Profile), making it a transparent replacement for wired UART connections.
HC-05 Compatible: Pin-compatible and command-compatible with HC-05 modules — swap it in with minimal reconfiguration.
Low Power Design: Optimized for power efficiency, making it suitable for battery-powered projects and embedded systems.
Easy AT Command Configuration: Configure baud rate, device name, pairing PIN, and more via standard AT commands.
Compact Form Factor: Small, lightweight PCB that fits easily into prototypes, enclosures, and custom PCB layouts.
Broad Compatibility: Works with Arduino, Raspberry Pi, STM32, ESP32, and other popular microcontroller platforms.
Stable Bluetooth Connection: Supports Bluetooth 3.0 SPP for a reliable, low-latency wireless serial link.

Technical Specifications

Model: JDY-31
Protocol: Bluetooth SPP-C (Serial Port Profile)
Bluetooth Version: 3.0
Interface: UART (Serial)
Operating Voltage: 3.3V – 5V
Default Baud Rate: 9600 bps (configurable via AT commands)
Replaces: HC-05 Bluetooth module

Perfect For

Arduino & Raspberry Pi wireless serial projects
Robot control via Bluetooth from a smartphone or PC
Wireless data logging and monitoring systems
IoT prototyping and embedded development boards
Replacing legacy HC-05 modules in existing designs

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Frequently Asked Questions

Q: What is the JDY-31 SPP-C Bluetooth Serial Pass-Through Module used for?

A: The JDY-31 SPP-C is a Bluetooth 3.0 serial pass-through module that enables wireless UART communication between microcontrollers and Bluetooth-enabled devices such as smartphones, PCs, or tablets. It is ideal for Arduino, Raspberry Pi, STM32, and other embedded development platforms.

Q: Can the JDY-31 replace an HC-05 Bluetooth module?

A: Yes — the JDY-31 SPP-C is designed as a direct replacement for the HC-05. It is pin-compatible and supports the same AT command set, allowing you to swap it into existing HC-05-based designs with minimal or no code changes.

Q: How do I configure the JDY-31 SPP-C module?

A: The JDY-31 is configured using standard AT commands sent over its UART interface. You can set the device name, baud rate, pairing PIN, and communication mode. Simply connect it to a serial terminal at the default baud rate (9600 bps) and send AT commands to customize its settings.

Q: What voltage does the JDY-31 SPP-C operate at?

A: The JDY-31 SPP-C module operates on 3.3V to 5V, making it compatible with both 3.3V systems (like Raspberry Pi and ESP32) and 5V systems (like most Arduino boards).

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.