Resources:
Wiki: www.waveshare.com/wiki/ESP32-S3-Relay-1CH
Industrial ESP32-S3 WiFi Relay Module with 1-Channel 10 A Relay, Wi-Fi, Bluetooth 5, Isolated RS485 and DIN Rail Mount Enclosure
The Industrial 1-Channel ESP32-S3 WiFi Relay Module is a robust industrial automation controller designed for reliable remote switching, monitoring, and control applications. Powered by the ESP32-S3 microcontroller featuring a dual-core Xtensa® 32-bit LX7 processor running at up to 240 MHz, the module combines high-performance processing with integrated 2.4 GHz Wi-Fi and Bluetooth 5 (LE) connectivity. Equipped with a high-quality 10 A relay, isolated RS485 interface, real-time clock (RTC), and multiple isolation circuits, it provides a dependable platform for industrial IoT, smart factory automation, energy management, and remote equipment control.
Housed in a rugged DIN rail-mount enclosure, the module is designed for quick installation in industrial control cabinets. USB Type-C connectivity simplifies power delivery, firmware updates, and debugging, while the onboard RTC enables scheduled automation tasks. Comprehensive electrical isolation—including optocoupler isolation, digital isolation, and isolated power architecture—improves system reliability and protects against electrical noise in demanding industrial environments.
Key Features
- ESP32-S3 Microcontroller: Powered by a dual-core Xtensa® 32-bit LX7 processor operating at up to 240 MHz.
- Integrated Wireless Connectivity: Supports 2.4 GHz Wi-Fi and Bluetooth 5 (LE) for wireless communication.
- Industrial Relay Output: High-quality single-channel relay rated for up to 10 A at 250 VAC or 30 VDC.
- Isolated RS485 Interface: Enables communication with Modbus devices, industrial sensors, and RS485 networks.
- Built-In RTC: Integrated real-time clock supports scheduled switching and automation tasks.
- USB Type-C Interface: Provides power input, firmware programming, and debugging through a single connector.
- 5 V Power Input: Dedicated screw terminal for stable 5 V DC power supply.
- Optocoupler Isolation: Protects the control circuitry from high-voltage switching interference.
- Digital Signal Isolation: Reduces noise and improves communication reliability.
- Integrated Power Isolation: Provides isolated voltage internally without requiring an additional isolated power supply.
- RS485 Status Indicators: TX and RX LEDs simplify communication monitoring and troubleshooting.
- DIN Rail Enclosure: Protective rail-mount case enables fast installation in industrial cabinets.
Applications
- Industrial automation
- Smart factory systems
- Remote equipment control
- Building automation
- Smart home control
- Energy management systems
- Modbus RTU networks
- Industrial IoT gateways
- Process monitoring
- PLC expansion and control
- Relay-based automation systems
1-CH ESP32-S3 WiFi Relay Module
Based on ESP32-S3, Supports Wi-Fi / Bluetooth, Onboard RS485 interface
Built-in protection circuits such as power isolation and optocoupler isolation, Safe & Stable & Reliable
Application Example
Provides Multiple Networking Demos With Waveshare.Cloud, Using The Lightweight MQTT Protocol To Achieve Data Visualization Service
Interface Description
What's On Board
- ESP32-S3
up to 240MHz operating frequency, with 2.4GHz WiFi and BLE
- DC-DC power module
supports up to 3.3V 2A output
- Pin header (2.0mm pitch)
for connecting to other functional modules
- Power supply screw terminal
supports DC 5V voltage input
- USB Type-C port
for module power supply, firmware downloading, and USB communication
- RTC battery header
for connecting a rechargeable RTC battery (SH1.0)
- Onboard ceramic antenna
for the ESP32-S3-Relay-1CH-U version, the onboard antenna can be enabled via resoldering an onboard resistor
- IPEX Gen 1 connector
For the ESP32-S3-Relay-1CH version, the external antenna can be enabled via resoldering an onboard resistor
- LED indicators
PWR: Power indicator
RELAY: Relay indicator, lights up when the Normally Open (NO) is closed
RS485: lights up green when the RS485 port sends data; lights up blue when the RS485 port receives data
- Optocoupler isolation
- Power supply isolation
Provides stable isolated voltage; no extra power supply is required for the isolated terminal
- ESP32 BOOT button
- ESP32 RESET button
- TVS diode
Effectively suppresses surge voltage and transient spike voltage in the circuit
- Quality relay
contact rating: ≤10A 250V AC or ≤10A 30V DC
- RS485 matching resistor
Onboard reserved 120R matching resistor, enabled via jumper
- RS485 and relay terminal
- PCF85063 RTC chip
- 16MB Flash
- Digital isolation
prevents interference from external signal
- RS485 transceiver chip
- ME6217C33M5G
Low-dropout regulator, 800 mA output (Max.)
- Thickened track for large current
Enclosure Design
Protection Enclosure with 35mm rail-mount support, easy to install, safe to use
Dimensions
Package Content:
- ESP32-S3-Relay-1CH x1
- SH1.0 4PIN cable ~150mm x1
- Screwdriver x1
