{"product_id":"m5stack-2relay-unit-dual-spst-relay-u131","title":"M5Stack 2Relay Unit – Dual SPST Relay Module | U131","description":"\u003cp\u003eThe M5Stack 2Relay Unit lets a controller switch two independent normally open circuits for pumps, valves, lamps, signal lines, and power-sequencing prototypes. Each SPST mechanical relay has a blue status LED and separate terminal wiring. The module is useful when two low-frequency loads need isolated contact switching, but the final design must still account for inrush current, fusing, conductor size, enclosure safety, switching life, and independent feedback.\u003c\/p\u003e\u003ch2\u003eSwitch Two Loads with the M5Stack 2Relay Unit\u003c\/h2\u003e\u003ch3\u003eControl Two Independent Normally Open Channels\u003c\/h3\u003e\u003cp\u003eEach SPST relay closes its own normally open contact when commanded by the corresponding digital output.\u003c\/p\u003e\u003ch3\u003eCheck Channel State with Blue Indicators\u003c\/h3\u003e\u003cp\u003eTwo blue LEDs show the electrical command state, helping with setup and troubleshooting.\u003c\/p\u003e\u003ch3\u003eDesign Load Wiring for the Real Application\u003c\/h3\u003e\u003cp\u003eEvaluate voltage, steady current, inrush, switching frequency, protection, and terminal wiring before connecting the load.\u003c\/p\u003e\u003ch2\u003eWhat You Can Build with M5Stack 2Relay Unit\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePump and valve control\u003c\/li\u003e\n\u003cli\u003eAppliance switching prototypes\u003c\/li\u003e\n\u003cli\u003eTwo-channel power sequencing\u003c\/li\u003e\n\u003cli\u003eIndustrial signal switching\u003c\/li\u003e\n\u003cli\u003eTest-fixture load control\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eIntegration and Workflow\u003c\/h2\u003e\u003col\u003e\n\u003cli\u003eConfirm that both selected host pins support digital output mode.\u003c\/li\u003e\n\u003cli\u003eComplete all load-side wiring with power removed and use suitable fusing, conductors, terminals, and enclosure protection.\u003c\/li\u003e\n\u003cli\u003eInitialize both relay commands to off, then test one channel at a time with a low-risk load.\u003c\/li\u003e\n\u003cli\u003eApply maximum on-time limits and use independent sensors when the physical result must be confirmed.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch2\u003eDeployment Notes\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eThe contacts are SPST normally open and do not provide mechanical position feedback.\u003c\/li\u003e\n\u003cli\u003eThe 8 A reference depends on load type, inrush current, wiring, temperature, and switching life.\u003c\/li\u003e\n\u003cli\u003eMechanical relays have finite contact life and produce switching transients.\u003c\/li\u003e\n\u003cli\u003eThe module is not a certified safety relay, emergency stop, or protective disconnect.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDevelopment Resources\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/docs.m5stack.com\/en\/products\/sku\/U131\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"\u003eM5Stack U131 Documentation\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/uiflow2.m5stack.com\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"\u003eM5Stack UiFlow2 Development Environment\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/docs.arduino.cc\/software\/ide\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"\u003eArduino IDE Documentation\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LogicBoundless","offers":[{"title":"Default Title","offer_id":49240338464983,"sku":"LB-M5-U131","price":8.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0801\/8952\/2135\/files\/1_1ce225cc-26ef-4e3e-9a57-bbf0864dcf9f.jpg?v=1783243269","url":"https:\/\/logicboundless.com\/products\/m5stack-2relay-unit-dual-spst-relay-u131","provider":"LogicBoundless","version":"1.0","type":"link"}