Joy-IT ESP32-Relais 4-Channel Relay Module with ESP32-WROOM-32E, Wi-Fi, Bluetooth, USB-C, Opto-Isolated, SPDT Relays

The Joy-IT ESP32-Relais stands apart from generic relay boards by integrating a powerful ESP32-WROOM-32E microcontroller directly on the module, eliminating the need for an external controller. This all-in-one design simplifies wiring and reduces project footprint, making it ideal for smart home automation, industrial control, and IoT prototyping. With four SPDT relays capable of switching up to 10A loads, it handles both AC and DC applications with ease. Opto-isolation ensures reliable and safe operation, while USB-C programming and power input offer modern convenience. Whether you're a hobbyist or a professional, this module provides a robust platform for your connected relay projects.

Highlights

• Integrated ESP32-WROOM-32E microcontroller with Wi-Fi 802.11 b/g/n and Bluetooth 4.2 BR/EDR & BLE
• Four SPDT relays, each rated for 250V AC / 10A or 30V DC / 10A
• Opto-isolated relay channels for enhanced noise immunity and safety
• USB-C interface for programming and 5V DC power input, plus screw terminal for alternative power
• LED indicators for power and each relay status
• GPIO headers for expansion and additional interfacing
• Compatible with Arduino IDE, MicroPython, and ESP-IDF

In daily use

The ESP32-Relais excels in applications requiring remote control of high-power devices. Connect it to your home Wi-Fi network and use it to switch lights, motors, or appliances via a web interface or MQTT. The onboard ESP32 provides ample processing power for local automation logic, and Bluetooth connectivity allows direct smartphone control. The opto-isolated design protects the microcontroller from voltage spikes and interference, ensuring stable operation in noisy environments. Programming is straightforward via the USB-C port, and the module can be powered from the same connection or through the screw terminal for standalone deployments.

Full specifications

• Microcontroller: ESP32-WROOM-32E
• Wi-Fi: 802.11 b/g/n
• Bluetooth: 4.2 BR/EDR & BLE
• Relay channels: 4 (SPDT)
• Max relay load: 250V AC / 10A, 30V DC / 10A
• Input voltage: 5V DC
• Power input: USB-C or screw terminal
• Programming interface: USB-C
• Opto-isolation: Yes (relay channels)
• LED indicators: Power and per-relay status
• Operating temperature: -40°C to +85°C
• GPIO: Available via headers
• Supported IDEs: Arduino IDE, MicroPython, ESP-IDF

Final note

The Joy-IT ESP32-Relais combines the versatility of the ESP32 with robust relay outputs, offering a complete solution for your switching needs. Its compact design and comprehensive features make it a valuable addition to any maker's toolkit.