{"product_id":"esp32-8-channel-relay-module-rs485-modbus-wifi-bluetooth","title":"ESP32 8-Channel Relay Module RS485 Modbus WiFi Bluetooth","description":"\n\u003ch2\u003eESP32 8-Channel Relay Module with RS485, Modbus, WiFi \u0026amp; Bluetooth\u003c\/h2\u003e\n\u003cp\u003eTake full control of your automation projects with this powerful \u003cstrong\u003eESP32-based 8-Channel Relay Module\u003c\/strong\u003e. Designed for makers, engineers, and industrial automation enthusiasts, this module combines the versatility of the ESP32 microcontroller with robust RS485 Modbus communication, optocoupler-isolated inputs and outputs, and built-in WiFi and Bluetooth — all in one compact, ready-to-use board.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eESP32 Microcontroller:\u003c\/strong\u003e Integrated WiFi and Bluetooth connectivity for wireless control and monitoring of your relay outputs from anywhere on your network.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e8-Channel Optocoupler-Isolated Inputs \u0026amp; Outputs:\u003c\/strong\u003e Full electrical isolation on both the 8-way input and 8-way output channels protects your microcontroller and sensitive components from voltage spikes and noise.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRS485 Interface with Modbus Support:\u003c\/strong\u003e Industry-standard RS485 communication bus with Modbus protocol makes this module ideal for integration into professional automation and control systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in CH340 Serial Port Chip:\u003c\/strong\u003e Enables one-click program burning directly via USB — no external programmer required. Streamlined firmware flashing for a faster development workflow.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Input Voltage Range:\u003c\/strong\u003e Powered via DC 9–24V or TYPE-C USB, giving you flexible deployment options whether on the bench or in the field.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Measures just 152 × 87 mm, making it easy to integrate into enclosures and project builds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMicrocontroller\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eESP32 (WiFi + Bluetooth)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8-Channel Output\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOptocoupler Isolation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8-Way Input \/ 8-Way Output\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRS485 \/ Modbus\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSerial Chip\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCH340 (USB, one-click programming)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 9–24V \/ TYPE-C USB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e152 × 87 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× ESP32 8-Channel Relay Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDue to differences in lighting and display settings, the product's color may vary slightly from the images shown.\u003c\/li\u003e\n  \u003cli\u003ePlease allow a tolerance of 1 mm–1 cm due to manual measurement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003cp\u003eFor more information on electrical safety standards for low-voltage devices, visit CPSC Electrical Safety.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What communication protocols does this ESP32 relay module support?\u003c\/h4\u003e\n\u003cp\u003eA: This module supports RS485 serial communication with Modbus protocol, making it compatible with a wide range of industrial automation systems and PLCs. It also features built-in WiFi and Bluetooth via the ESP32 chip for wireless control.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I program the ESP32 relay module?\u003c\/h4\u003e\n\u003cp\u003eA: The board includes an onboard CH340 USB-to-serial chip, which allows you to connect directly via a TYPE-C USB cable and upload your firmware with one click using the Arduino IDE or other compatible development environments — no external programmer needed.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the purpose of the optocoupler isolation on this relay module?\u003c\/h4\u003e\n\u003cp\u003eA: Optocoupler isolation electrically separates the control circuitry (ESP32) from the input and output relay circuits. This protects the microcontroller from voltage surges, noise, and back-EMF that can occur when switching inductive loads, resulting in a more reliable and durable system.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What power supply does this module require?\u003c\/h4\u003e\n\u003cp\u003eA: The module accepts a wide DC input voltage of 9–24V, as well as power via TYPE-C USB. This dual-power option makes it flexible for both bench testing and real-world installations.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What communication protocols does this ESP32 relay module support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This module supports RS485 serial communication with Modbus protocol, making it compatible with a wide range of industrial automation systems and PLCs. 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