{"product_id":"jdy-31-spp-c-bluetooth-serial-pass-through-module-hc-05-replacement","title":"JDY-31 SPP-C Bluetooth Serial Pass-Through Module | HC-05","description":"\n\u003ch2\u003eJDY-31 SPP-C Bluetooth Serial Pass-Through Module\u003c\/h2\u003e\n\u003cp\u003eUpgrade your wireless serial communication setup with the \u003cstrong\u003eJDY-31 SPP-C Bluetooth Serial Pass-Through Module\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose the JDY-31 SPP-C?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWireless Serial Communication:\u003c\/strong\u003e Transmits serial data over Bluetooth SPP (Serial Port Profile), making it a transparent replacement for wired UART connections.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHC-05 Compatible:\u003c\/strong\u003e Pin-compatible and command-compatible with HC-05 modules — swap it in with minimal reconfiguration.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Power Design:\u003c\/strong\u003e Optimized for power efficiency, making it suitable for battery-powered projects and embedded systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy AT Command Configuration:\u003c\/strong\u003e Configure baud rate, device name, pairing PIN, and more via standard AT commands.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Small, lightweight PCB that fits easily into prototypes, enclosures, and custom PCB layouts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad Compatibility:\u003c\/strong\u003e Works with Arduino, Raspberry Pi, STM32, ESP32, and other popular microcontroller platforms.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStable Bluetooth Connection:\u003c\/strong\u003e Supports Bluetooth 3.0 SPP for a reliable, low-latency wireless serial link.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e JDY-31\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProtocol:\u003c\/strong\u003e Bluetooth SPP-C (Serial Port Profile)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBluetooth Version:\u003c\/strong\u003e 3.0\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterface:\u003c\/strong\u003e UART (Serial)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e 3.3V – 5V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDefault Baud Rate:\u003c\/strong\u003e 9600 bps (configurable via AT commands)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReplaces:\u003c\/strong\u003e HC-05 Bluetooth module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino \u0026amp; Raspberry Pi wireless serial projects\u003c\/li\u003e\n  \u003cli\u003eRobot control via Bluetooth from a smartphone or PC\u003c\/li\u003e\n  \u003cli\u003eWireless data logging and monitoring systems\u003c\/li\u003e\n  \u003cli\u003eIoT prototyping and embedded development boards\u003c\/li\u003e\n  \u003cli\u003eReplacing legacy HC-05 modules in existing designs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cp\u003ePair this module with other great components from our store:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/ccb-flat-round-spacer-beads-diy-jewelry-making\"\u003e4\/6mm CCB Flat Round Spacer Beads DIY Jewelry Making 100-200pcs\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/round-aluminum-wire-diy-jewelry-making-1mm-3mm\"\u003eRound Aluminum Wire 1mm–3mm | DIY Jewelry Making Wire\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.epa.gov\/recycle\/used-lithium-ion-batteries\" target=\"_blank\" rel=\"noopener\"\u003eEPA guidance on lithium-ion battery handling\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the JDY-31 SPP-C Bluetooth Serial Pass-Through Module used for?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can the JDY-31 replace an HC-05 Bluetooth module?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I configure the JDY-31 SPP-C module?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What voltage does the JDY-31 SPP-C operate at?\u003c\/h4\u003e\n\u003cp\u003eA: 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).\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the JDY-31 SPP-C Bluetooth Serial Pass-Through Module used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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. 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