This ESP32-powered IoT module is equipped with a 4-channel relay system, tailored for integrating actuators into smart systems. With four built-in relays, it enables direct control over multiple devices. The board also provides multiple I2C and general-purpose I/O pins to support a variety of external sensors and actuators, offering great flexibility for expansion. Onboard components include an OLED screen, buzzer, and four tactile buttons, delivering essential input/output capabilities. Compatible with Arduino IDE, MicroPython, and other Espressif-supported environments such as ESP-IDF, the board is a practical tool for both prototyping and production. Its robust design suits industrial deployments, while remaining accessible to developers, engineers, and hobbyists working in IoT and embedded system applications.
Specifications
MCU: ESP-32
Supports 802.11 b/g/n Wi-Fi connectivity with speeds up to 150 Mbps.
Support for both Classic Bluetooth v4.2 and BLE specifications.
Four integrated relay switches to control devices
Input: 4×Pushbuttons
13×GPIO pins (Follow original ESP32 functions)
Output: OLED display, Buzzer, LED
I2C: 3×5V I2C pins, 3×3.3V I2C pins
Voltage output pins: 4×3.3V/200mA, 4×5V/600mA
2×Dry contacts with debouncing filter
USB-to-UART Bridge
Resettable Fuse
Power Mode Selector Switch
Compatibility with Arduino IDE, MicroPython, and other Espressif chips compatible platforms
Temp: 40 ~ 85 (℃)
Flash: 4 MB
PSRAM: 520 KB
Size: 122 x 88 mm
Interfaces: I/O, I2C, One-wire, USB
Antenna: PCB
For more detailed information, the user manual can be downloaded [here]