{"product_id":"lcus-usb-relay-module-1-2-4-8-channel-smart-home-controller","title":"LCUS USB Relay Module 1\/2\/4\/8 Channel Smart Home Switch","description":"\n\u003ch2\u003eLCUS USB Relay Module — Intelligent Control Switch for Smart Home \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eTake full command of your smart home, automation projects, or Arduino\/STM setups with the \u003cstrong\u003eJessinie LCUS USB Relay Module\u003c\/strong\u003e. Available in 1, 2, 4, and 8-channel configurations (LCUS-1, LCUS-2, LCUS-4, LCUS-8), this compact and reliable module lets you control AC and DC loads directly from your computer via USB serial commands — no extra hardware required.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're a hobbyist, engineer, or smart-home enthusiast, the LCUS relay module offers plug-and-play simplicity with robust performance and multi-channel flexibility. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose the LCUS USB Relay Module?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMultiple Channel Options:\u003c\/strong\u003e Choose from 1, 2, 4, or 8-channel versions to match your project's exact needs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCH340 USB-to-Serial Chip:\u003c\/strong\u003e Industry-standard CH340 chip ensures stable, reliable USB communication with your PC.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Performance Microcontroller:\u003c\/strong\u003e Onboard controller chip provides fast, accurate command execution.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Switching Capacity:\u003c\/strong\u003e Relays rated at 10A \/ 250V AC and 10A \/ 30V DC — suitable for a wide range of AC and DC loads.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLong Relay Lifespan:\u003c\/strong\u003e Each relay supports up to 10 million continuous switching cycles.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-In Protection:\u003c\/strong\u003e Features overcurrent protection and relay diode freewheeling protection for safe, dependable operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLED Status Indicators:\u003c\/strong\u003e Onboard power LED and individual relay status LEDs for at-a-glance monitoring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Power Supply:\u003c\/strong\u003e Supports both USB power and external 5V DC power supply (switchable via toggle).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with Arduino, STM \u0026amp; More:\u003c\/strong\u003e Ideal for DIY electronics, home automation, industrial control, and maker projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLCUS-1 \/ LCUS-2 \/ LCUS-4 \/ LCUS-8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChannels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 \/ 2 \/ 4 \/ 8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUSB Control Chip\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCH340 USB to Serial\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10A \/ 250V AC  |  10A \/ 30V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication Baud Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9600 bps\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommand Protocol\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHEX serial commands (4-byte packet)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSB (5V) or External 5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProtection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOvercurrent protection, diode freewheeling protection\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 10,000,000 switching cycles\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Software\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSTC-ISP, SSCOM32, any serial terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eUSB Switch Command Protocol\u003c\/h3\u003e\n\u003cp\u003eCommands are sent as 4-byte HEX packets via your serial terminal at baud rate 9600:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eByte 1:\u003c\/strong\u003e Start identifier (default: \u003ccode\u003e0xA0\u003c\/code\u003e)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eByte 2:\u003c\/strong\u003e Channel address (e.g., \u003ccode\u003e0x01\u003c\/code\u003e = Channel 1)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eByte 3:\u003c\/strong\u003e Operation (\u003ccode\u003e0x01\u003c\/code\u003e = ON, \u003ccode\u003e0x00\u003c\/code\u003e = OFF)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eByte 4:\u003c\/strong\u003e Checksum\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eExample — Channel 1:\u003c\/strong\u003e\u003cbr\u003e\nTurn ON: \u003ccode\u003eA0 01 01 A2\u003c\/code\u003e\u003cbr\u003e\nTurn OFF: \u003ccode\u003eA0 01 00 A1\u003c\/code\u003e\u003c\/p\u003e\n\n\u003ch3\u003eQuick Setup Guide\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003ePlug the USB relay module into your computer.\u003c\/li\u003e\n  \u003cli\u003eInstall the CH340 USB-to-serial driver (required on first use).\u003c\/li\u003e\n  \u003cli\u003eOpen serial debugging software (e.g., SSCOM32 or STC-ISP).\u003c\/li\u003e\n  \u003cli\u003eSet baud rate to \u003cstrong\u003e9600\u003c\/strong\u003e and select \u003cstrong\u003eHEX Send\u003c\/strong\u003e mode.\u003c\/li\u003e\n  \u003cli\u003eSend the appropriate HEX command to toggle your relay channel ON or OFF.\u003c\/li\u003e\n  \u003cli\u003eUse the \"Auto Cycle Send\" feature for automated switching routines.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003ePower Supply Tip:\u003c\/strong\u003e If using external power mode (\"Ext_P\"), always connect the external 5V DC supply — without it, the relay LED will light but the relay will not activate.\u003c\/p\u003e\n\n\u003ch3\u003eRelay Status Check (LCUS-4 \/ LCUS-8)\u003c\/h3\u003e\n\u003cp\u003eSend \u003ccode\u003eFF\u003c\/code\u003e in HEX format to query the current status of all relay channels. The module will return a readable status string, e.g.:\u003cbr\u003e\n\u003ccode\u003eCH1:ON CH2:ON CH3:OFF CH4:OFF\u003c\/code\u003e\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eQ: What is the difference between the LCUS-1, LCUS-2, LCUS-4, and LCUS-8 USB relay modules?\u003c\/h4\u003e\n\u003cp\u003eA: The LCUS-1, LCUS-2, LCUS-4, and LCUS-8 USB relay modules differ only in the number of independently controllable relay channels — 1, 2, 4, and 8 channels respectively. All share the same CH340 USB-to-serial chip, the same HEX command protocol at 9600 baud, and the same 10A relay rating. Choose the channel count that matches the number of devices or circuits you need to control.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What software do I need to control the LCUS USB relay module from my computer?\u003c\/h4\u003e\n\u003cp\u003eA: You need to first install the \u003cstrong\u003eCH340 USB-to-serial driver\u003c\/strong\u003e on your computer. After that, any serial terminal software capable of sending HEX commands works — popular options include SSCOM32 and STC-ISP. Simply set the baud rate to 9600, switch to HEX mode, and send the 4-byte command packet to control each relay channel.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can the LCUS USB relay module be used with Arduino or other microcontrollers?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The LCUS USB relay module is fully compatible with Arduino, STM32, Raspberry Pi, and any platform that supports USB serial communication. You can send HEX commands programmatically from your microcontroller or custom software application to automate relay switching for smart home, industrial, or DIY electronics projects.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What loads can the LCUS relay module switch?\u003c\/h4\u003e\n\u003cp\u003eA: The onboard relays are rated at \u003cstrong\u003e10A \/ 250V AC\u003c\/strong\u003e and \u003cstrong\u003e10A \/ 30V DC\u003c\/strong\u003e, making them suitable for controlling a wide variety of household and low-voltage DC loads including lights, fans, pumps, solenoids, and other appliances within the rated current and voltage limits.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Do I need an external power supply for the LCUS relay module?\u003c\/h4\u003e\n\u003cp\u003eA: For the LCUS-1 and most single-channel applications, USB power from your computer is typically sufficient. The LCUS-4 and LCUS-8 modules include a toggle switch to select between USB power (\"Usb_P\") and an external 5V DC power supply (\"Ext_P\"). If you select external power mode, you must connect the 5V supply — otherwise the relays will not operate even if the status LEDs are lit.\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 difference between the LCUS-1, LCUS-2, LCUS-4, and LCUS-8 USB relay modules?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The LCUS-1, LCUS-2, LCUS-4, and LCUS-8 USB relay modules differ only in the number of independently controllable relay channels — 1, 2, 4, and 8 channels respectively. All share the same CH340 USB-to-serial chip, the same HEX command protocol at 9600 baud, and the same 10A relay rating. Choose the channel count that matches the number of devices or circuits you need to control.\"}}, {\"@type\": \"Question\", \"name\": \"What software do I need to control the LCUS USB relay module from my computer?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"You need to first install the CH340 USB-to-serial driver on your computer. After that, any serial terminal software capable of sending HEX commands works — popular options include SSCOM32 and STC-ISP. Simply set the baud rate to 9600, switch to HEX mode, and send the 4-byte command packet to control each relay channel.\"}}, {\"@type\": \"Question\", \"name\": \"Can the LCUS USB relay module be used with Arduino or other microcontrollers?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! The LCUS USB relay module is fully compatible with Arduino, STM32, Raspberry Pi, and any platform that supports USB serial communication. You can send HEX commands programmatically from your microcontroller or custom software application to automate relay switching for smart home, industrial, or DIY electronics projects.\"}}, {\"@type\": \"Question\", \"name\": \"What loads can the LCUS relay module switch?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The onboard relays are rated at 10A \/ 250V AC and 10A \/ 30V DC, making them suitable for controlling a wide variety of household and low-voltage DC loads including lights, fans, pumps, solenoids, and other appliances within the rated current and voltage limits.\"}}, {\"@type\": \"Question\", \"name\": \"Do I need an external power supply for the LCUS relay module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"For the LCUS-1 and most single-channel applications, USB power from your computer is typically sufficient. The LCUS-4 and LCUS-8 modules include a toggle switch to select between USB power (\\\"Usb_P\\\") and an external 5V DC power supply (\\\"Ext_P\\\"). If you select external power mode, you must connect the 5V supply — otherwise the relays will not operate even if the status LEDs are lit.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/0dwbi8-fa.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/0dwbi8-fa.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"LCUS USB Relay Module 1\/2\/4\/8 Channel Smart Home Switch\", \"item\": \"https:\/\/0dwbi8-fa.myshopify.com\/products\/lcus-usb-relay-module-1-2-4-8-channel-smart-home-controller\"}]}\u003c\/script\u003e","brand":"Quake","offers":[{"title":"LCUS-1","offer_id":50286588100835,"sku":"14:1202#LCUS-1","price":11.8,"currency_code":"USD","in_stock":true},{"title":"LCUS-2","offer_id":50286588133603,"sku":"14:350852#LCUS-2","price":16.1,"currency_code":"USD","in_stock":true},{"title":"LCUS-4","offer_id":50286588166371,"sku":"14:351074#LCUS-4","price":25.24,"currency_code":"USD","in_stock":true},{"title":"LCUS-8","offer_id":50286588199139,"sku":"14:4044226#LCUS-8","price":36.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/9439\/1523\/files\/S72cec77453014033977dab9802f42f0cT.webp?v=1790289906","url":"https:\/\/quakegoods.com\/products\/lcus-usb-relay-module-1-2-4-8-channel-smart-home-controller","provider":"Quake","version":"1.0","type":"link"}