WSAL26756 – ESP32-S3-Relay-6CH/en
Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.
Summary
The ESP32-S3-Relay-6CH is an industrial 6-channel WiFi relay module based on the ESP32-S3 microcontroller. It provides WiFi, Bluetooth LE, RS485, and Pico-compatible HAT interfaces, along with multiple isolation circuits for AIoT applications.
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Technical overview
- Based on an ESP32-S3 with an Xtensa LX7 dual-core processor (up to 240 MHz), 2.4 GHz WiFi, and Bluetooth LE
- Six relay channels in 1NO/1NC form; contact rating per channel: up to 10 A at 250 V AC or 10 A at 30 V DC
- Power supply via screw terminal supporting 7–36 V DC or via USB Type-C (5 V / 1 A)
- Integrated optocoupler, digital, and power-isolation circuits protect the control electronics from interference in the load circuit
- RS485 interface with an optional 120 Ω termination resistor that can be enabled through a jumper
- Pico-compatible HAT headers allow connecting expansion modules such as RTC, CAN, RS232/RS485, LoRa, or sensors
- Status indicators show operating state: PWR (power), RXD/TXD (RS485 receive/transmit), WS2812 RGB LED on GP38, and a passive buzzer on GP21
- Dimensions are approximately 88 mm height × 122 mm width; the enclosure supports DIN-rail mounting for secure installation
- Development environments include Arduino IDE (with ESP32 board support) and MicroPython via Thonny; demo projects cover WiFi access point, station mode, MQTT, and full-control scenarios
- Simultaneous use of multiple communication paths (WiFi, BLE, RS485) is possible depending on project requirements
Notes and version constraints
- The exact pin mapping for external RS485 devices depends on the specific Modbus RTU module; verify the correct address and baud rate
- When flashing over USB, driver issues may occur on macOS; install the appropriate driver and retry
- With inductive loads (motors, coils, lamps), inrush current can greatly exceed the rated value; ensure sufficient current margin
- Always cut off power before maintenance, wiring, or replacing the relay
- Do not operate in humid, dusty, flammable, or explosive environments
- If RS485 communication is unreliable, move the jumper to enable the 120 Ω termination resistor and retest
Source and revision record
- ESP32-S3-Relay-6CH - Waveshare Wiki
- Source revision: 110972
- Captured: 2026-08-29T08:23:25+00:00
- SHA-256:
27375d90de469d2e36992eb9e84c27d2ae53a0fb88534ac61c28dc981e78d290