Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Development, Learning, Evaluation & Industrial Control Boards |
| Origin | - |
| Microcontroller | ESP32-WROOM-32 |
| Relay Channels | 4 Independent Channels |
| Max Load Current | 10A per Channel @ 250VAC |
| Communication Interfaces | Wi-Fi 802.11 b/g/n, Bluetooth 4.2 BR/EDR and BLE |
| Operating Voltage | 5V DC (Logic), 250VAC/30VDC (Load) |
| Programming Support | Arduino IDE, MicroPython, ESP-IDF |
| Flash Memory | 4MB SPI Flash |
| GPIO Pins Available | Multiple exposed pins for sensors and peripherals |
| Dimensions | 85mm x 55mm x 20mm |
| Included Documentation | PDF Schematics, Wiring Guide, and Code Examples |
Anonymous
Mar 31, 2026
Rating: 4/5
Great value, minor pin labeling issue
Overall a fantastic module for the price. All four relays work perfectly under load. I deducted one star because two of the GPIO pin labels on the silkscreen were slightly hard to read, but the schematic cleared it up.
Anonymous
Mar 25, 2026
Rating: 5/5
Perfect for Home Automation Projects
This board made setting up my smart lighting system incredibly easy. The relay switching is silent and responsive via Wi-Fi. Documentation was clear enough to get started with MicroPython immediately.
Anonymous
Mar 22, 2026
Rating: 5/5
Excellent for Learning IoT
As someone new to embedded systems, the included examples for Arduino were a lifesaver. I had the relays toggling via a web server interface within an hour of unboxing.
Anonymous
Mar 16, 2026
Rating: 5/5
Best 4-channel board I've used
Compact design that fits easily into standard project enclosures. The auto-flashing feature saved me time during initial setup. Highly recommended for anyone building industrial control prototypes.
Anonymous
Mar 14, 2026
Rating: 5/5
Robust and Reliable
I've been running this board controlling a small pump system for three weeks without a single disconnect. The ESP32 handles the network traffic well, and the relay isolation gives me peace of mind.
Anonymous
Mar 08, 2026
Rating: 4/5
Solid hardware, needs external antenna for range
The build quality is excellent and the screw terminals are secure. If you plan to place this far from your router, consider using the external antenna connector option if available on your specific revision, though the onboard antenna worked fine for me in the same room.
Q: Is the MicroPython firmware pre-installed?
A: No, the board typically ships with a basic demo or no firmware. You will need to flash the MicroPython binary yourself using a tool like esptool.py, but our documentation provides a step-by-step guide for this process.
Q: Does this support OTA (Over-The-Air) updates?
A: Yes, since it is based on the ESP32 chip, it fully supports OTA updates. You can implement this functionality using the Arduino IDE or ESP-IDF frameworks.
Q: What is the maximum voltage rating for the relay contacts?
A: The relays are rated for up to 250VAC or 30VDC. Please ensure your load does not exceed 10A per channel to maintain safety and longevity of the module.
Q: Are the relay outputs normally open or normally closed?
A: The screw terminals provided on this board are configured for Normally Open (NO) and Common (COM). There are no Normally Closed (NC) terminals exposed on this specific compact model.
Q: Can this board be powered directly via USB or does it need a separate 5V supply?
A: The board can be powered via the micro-USB port for the logic side. However, if you are switching high-load devices on the relays, we recommend a stable external 5V power source connected to the VIN pins to ensure reliable operation.
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