Description Chain Return Connector is a durable connector for M5Stack Chain series products and Unit Puzzle assemblies. It features two interconnected HY2.0-4P Grove interfaces, allowing the side edges of two Chain series components to be connected cleanly in compact hardware layouts. The connector also includes two 4.85mm LEGO-compatible holes, making it useful for quick mechanical mounting, modular assembly, and repeatable prototyping. For developers building Chain series input panels, learning kits, or DIY interaction devices, the Chain Return Connector helps route Grove-style signals while keeping the physical structure tidy. Each pack includes five connectors, giving projects enough parts for multi-device chains, classroom builds, and spare hardware during iteration. The compact plastic body and reinforced mounting holes make the Chain Return Connector practical for rapid prototyping, hardware interaction experiments, education, and small custom fixtures. Features Chain Return Connector design: connects side edges of Chain series components and Unit Puzzle modules. Dual Grove interfaces: two interconnected HY2.0-4P Grove interfaces for GND, 5V, IO1, and IO2 lines. Mechanical mounting: two 4.85mm LEGO-compatible holes support modular structure building. Pack quantity: supplied as a 5-piece set for multi-node Chain series layouts. Use cases: rapid prototyping, hardware interaction, education, learning, and DIY projects. Specifications Connector type Chain series side-edge return connector Interfaces 2 x interconnected HY2.0-4P Grove interfaces Pin mapping GND, 5V, IO1, IO2 Mounting holes 2 x 4.85mm LEGO-compatible holes Connector size 48.0 x 14.9 x 9.3mm Connector weight 15.0g for 5 pieces Package size 93.0 x 138.0 x 10.0mm Gross weight 18.0g Applications Chain Return Connector assemblies for linking Chain series components along the side edge. Rapid prototyping with Chain series controls, sensors, and Unit Puzzle structures. Education and learning kits that need repeatable, durable connector hardware. DIY projects where Grove signal routing and LEGO-compatible mounting holes are useful. Product List 5 x Chain Return Other Content The connector's HY2.0-4P pin map is Black for GND, Red for 5V, Yellow for IO1, and White for IO2. This simple pass-through arrangement helps keep Chain series wiring predictable when building modular layouts. The connector is intended for mechanical and electrical connection rather than active signal processing. It is especially useful when a project needs clean side-edge alignment between Chain series devices. Use the schematic and model size files to confirm dimensions, pin routing, and mounting space before committing to a fixed enclosure or classroom kit design. Resources Chain Return Connector product document Chain Return schematic PDF Chain Return model size PDF FAQ What is included in the pack? The pack includes five Chain Return connectors. What devices is it designed for? It is designed for M5Stack Chain series products and Unit Puzzle assemblies that need side-edge connection. What does the HY2.0-4P interface carry? The connector maps GND, 5V, IO1, and IO2 through the HY2.0-4P Grove interface. Can it be used for structural mounting? Yes. The two 4.85mm LEGO-compatible holes help with modular assembly and quick mechanical mounting.
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