Attributes

Brand	-
Category	Electronic Components / Maker DIY / Development Boards & Control Boards
Origin	-
Microcontroller	ESP32-WROOM-32
Relay Channels	4 Independent Channels
Max Load Capacity	10A per Relay @ 250VAC
Operating Voltage	5V DC Input
Wireless Protocol	Wi-Fi 2.4GHz & Bluetooth 4.2
Flash Storage	4MB SPI Flash
Programming Interface	Micro-USB Port
Supported IDEs	Arduino IDE, MicroPython, ESP-IDF
GPIO Availability	Multiple Pins Exposed
Board Dimensions	65mm x 45mm x 20mm

5 reviews

Anonymous

Apr 14, 2026

Rating: 5/5

Perfect for Home Automation

Works flawlessly with Home Assistant. The relay switching is fast and the Wi-Fi connection is stable. Highly recommend for IoT projects.

Anonymous

Mar 06, 2026

Rating: 5/5

Best ESP32 relay board I've used

Compact and reliable. I have used it to control lights and a fan. The auto-flashing support saved me a lot of time during development.

Anonymous

Feb 11, 2026

Rating: 3/5

One relay clicked loudly

Functionality is good but one of the relays makes a louder clicking noise than the others. Not a dealbreaker but noticeable in a quiet room.

Anonymous

Jan 28, 2026

Rating: 5/5

MicroPython support is excellent

Flashed CircuitPython easily and had the relays toggling within minutes. The GPIO access makes it very versatile for sensors too.

Anonymous

Jan 20, 2026

Rating: 4/5

Great hardware, docs need work

Board is solid and builds feel quality. Setup took a bit longer than expected because the wiki links were outdated, but once running it is great.

5 FAQ

Q: What is the coil voltage for the relays?

A: The relays are driven by the 5V input supply provided to the board.

Q: Does the package include a USB cable?

A: No, the USB cable is sold separately. You will need a standard Micro-USB data cable.

Q: Can I control this board via MQTT?

A: Yes, it is fully compatible with MQTT protocols when programmed using Arduino IDE or MicroPython.

Q: Is 3.3V logic supported on the GPIO pins?

A: Yes, the ESP32 operates at 3.3V logic levels. Please ensure connected sensors are compatible.

Q: Is Home Assistant integration easy?

A: Yes, there are many community examples available for ESPHome and MQTT integration with Home Assistant.

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