{"product_id":"8-channel-433mhz-rf-ttl-serial-relay-module-dc5v","title":"8-Channel 433MHz RF TTL Serial Relay Module Board DC 5V","description":"\n\u003ch2\u003e8-Channel 433MHz RF \u0026amp; TTL Serial Port Relay Module — DC 5V\u003c\/h2\u003e\n\u003cp\u003eTake full command of your automation projects with this versatile \u003cstrong\u003e8-Channel Serial Port Relay Module\u003c\/strong\u003e. Designed for makers, engineers, and electronics enthusiasts, this board combines \u003cstrong\u003e433MHz RF wireless remote control\u003c\/strong\u003e with \u003cstrong\u003eTTL serial communication\u003c\/strong\u003e to give you flexible, reliable switching across eight independent relay channels — all from a compact 128 × 48 × 16 mm form factor.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're building a smart home controller, an industrial automation panel, or a DIY electronics project, this relay board delivers the multi-mode control and cascading capability you need to get the job done right.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e8 High-Current Relays:\u003c\/strong\u003e Each relay supports up to 250V \/ 10A, providing strong driving capacity with individual LED status indicators for at-a-glance monitoring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Control Interfaces:\u003c\/strong\u003e Operate via TTL serial port (UART) or 433MHz RF remote control — giving you both wired and wireless flexibility.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFour Versatile Control Modes:\u003c\/strong\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cem\u003eSelf-Locking Mode:\u003c\/em\u003e Toggle a relay on or off with each button press (remote \u0026amp; TTL).\u003c\/li\u003e\n      \u003cli\u003e\n\u003cem\u003eInterlocking Mode:\u003c\/em\u003e Activating one relay automatically turns off all others — ideal for mutually exclusive switching (remote \u0026amp; TTL).\u003c\/li\u003e\n      \u003cli\u003e\n\u003cem\u003ePoint Action (Jog) Mode:\u003c\/em\u003e Relay stays active only while the remote button is held down (remote only).\u003c\/li\u003e\n      \u003cli\u003e\n\u003cem\u003eRound-Trip (Timed) Mode:\u003c\/em\u003e Relay opens on command, then automatically closes after a set delay — default 3 seconds, configurable up to 65,535 seconds via serial port (remote \u0026amp; TTL).\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCascadable Design:\u003c\/strong\u003e Chain up to 8 boards together to control a total of 64 relays from a single interface.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-In Protection:\u003c\/strong\u003e Overcurrent protection and reverse connection protection safeguard your circuitry and connected devices.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Power Input:\u003c\/strong\u003e Powered via USB Micro connector or screw-type terminal blocks — your choice.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNormally Open \u0026amp; Normally Closed Contacts:\u003c\/strong\u003e Supports both NO and NC wiring configurations for maximum circuit design flexibility.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfigurable Settings:\u003c\/strong\u003e Baud rate, module address, working mode, and power-restoration state are all readable and settable via serial port.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower-Off Memory:\u003c\/strong\u003e Optionally restore relay states after a power cycle, ensuring consistent behavior on restart.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 5V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e120 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication Interface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTTL Serial (UART)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNumber of Relays\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 Channels\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e250V \/ 10A (High-Current)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRF Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e433MHz (1 × RF Receiving Module included)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDefault Baud Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e115,200 BPS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDefault Module Address\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDefault Working Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-Locking\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCascade Support\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 8 boards (64 relays total)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e128 × 48 × 16 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEU LVD Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLow voltage: Below 50VAC or 75VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 8-Channel TTL\/433MHz RF Relay Module Board\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Due to lighting and display variation, item color may differ slightly from images. Please allow ±1–10mm tolerance due to manual measurement.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cp\u003eFor general guidance on safe wiring and relay circuit standards, visit the U.S. Consumer Product Safety Commission (CPSC) for consumer electronics safety information.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eQ: Can I control this 8-channel relay module wirelessly without a computer?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The board includes a built-in 433MHz RF receiving module, so you can control all 8 relay channels using a compatible 433MHz RF remote control — no computer or serial connection required. The remote supports Self-Locking, Interlocking, and Point Action (Jog) modes.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How many relay boards can I chain together, and how many relays can I control in total?\u003c\/h4\u003e\n\u003cp\u003eA: This relay module supports cascading of up to 8 boards. Each board has 8 relay channels, so you can control up to 64 relays in total from a single TTL serial interface — perfect for large-scale automation projects.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What happens to the relay states if power is lost and then restored?\u003c\/h4\u003e\n\u003cp\u003eA: The module supports power-off memory functionality. You can configure it to either restore the previous relay states after a power cycle or return to a defined default state. This setting is configurable via the TTL serial port, giving you full control over behavior after power restoration.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the default baud rate and can it be changed?\u003c\/h4\u003e\n\u003cp\u003eA: The default baud rate is 115,200 BPS. Both the baud rate and the module address are fully configurable and readable via the TTL serial port, allowing easy integration with a wide range of microcontrollers such as Arduino, Raspberry Pi, ESP32, and more.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Can I control this 8-channel relay module wirelessly without a computer?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! The board includes a built-in 433MHz RF receiving module, so you can control all 8 relay channels using a compatible 433MHz RF remote control — no computer or serial connection required. 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