ESP32 8-Channel Relay Module RS485 Modbus WiFi Bluetooth
ESP32 8-Channel Relay Module RS485 Modbus WiFi Bluetooth
ESP32 8-Channel Relay Module with RS485, Modbus, WiFi & Bluetooth
Take full control of your automation projects with this powerful ESP32-based 8-Channel Relay Module. 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.
Key Features
- ESP32 Microcontroller: Integrated WiFi and Bluetooth connectivity for wireless control and monitoring of your relay outputs from anywhere on your network.
- 8-Channel Optocoupler-Isolated Inputs & Outputs: 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.
- RS485 Interface with Modbus Support: Industry-standard RS485 communication bus with Modbus protocol makes this module ideal for integration into professional automation and control systems.
- Built-in CH340 Serial Port Chip: Enables one-click program burning directly via USB — no external programmer required. Streamlined firmware flashing for a faster development workflow.
- Wide Input Voltage Range: Powered via DC 9–24V or TYPE-C USB, giving you flexible deployment options whether on the bench or in the field.
- Compact Form Factor: Measures just 152 × 87 mm, making it easy to integrate into enclosures and project builds.
Specifications
| Microcontroller | ESP32 (WiFi + Bluetooth) |
| Relay Channels | 8-Channel Output |
| Optocoupler Isolation | 8-Way Input / 8-Way Output |
| Communication | RS485 / Modbus |
| Serial Chip | CH340 (USB, one-click programming) |
| Power Supply | DC 9–24V / TYPE-C USB |
| Dimensions | 152 × 87 mm |
What's in the Box?
- 1× ESP32 8-Channel Relay Module
Important Notes
- Due to differences in lighting and display settings, the product's color may vary slightly from the images shown.
- Please allow a tolerance of 1 mm–1 cm due to manual measurement.
Made in Mainland China.
For more information on electrical safety standards for low-voltage devices, visit CPSC Electrical Safety.
Frequently Asked Questions
Q: What communication protocols does this ESP32 relay module support?
A: 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.
Q: How do I program the ESP32 relay module?
A: 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.
Q: What is the purpose of the optocoupler isolation on this relay module?
A: 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.
Q: What power supply does this module require?
A: 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.