M5Stack Universal IoT Experiment Kit for ESP32 w/ SHT30 Sensor

The kit supports three primary development environments. For beginners, use M5Stack's graphical UIFlow (Blockly) via the web IDE or desktop app. For more control, use the Arduino IDE by installing the ESP32 board package and M5Stack library via the Board Manager. Advanced users can program it directly in MicroPython using Thonny or esptool to flash the firmware. All methods require a USB Type-C cable for connection and power.

The board is powered via the onboard USB Type-C port at 5V. The typical operating current is around 500mA, so ensure your USB port or adapter can supply at least 1A for stable operation, especially when driving multiple relays or motors simultaneously. An external 5V supply can also be connected to the appropriate terminals if not using USB. Avoid exceeding the 5V input rating to prevent damage.

Connect the RS-485 port's A and B terminals to your external RS-485 network. Use the included RS-232 cable for the RS-232 port. In your code (UIFlow, Arduino, MicroPython), initialize the corresponding UART serial port (typically UART2) with the correct baud rate (e.g., 9600, 19200). For Modbus communication, you will need a dedicated Modbus library to handle the protocol frames on top of the basic serial data transmission.

Yes, the kit features a stackable design compatible with the entire M5Stack ecosystem. Simply power off the unit, align the GPIO and bus connectors on the top or bottom, and stack additional modules like displays, sensors, or batteries. Each module section has an individual power switch, allowing you to isolate peripherals. Ensure your code accounts for the I2C addresses or GPIO pins used by the added modules to avoid conflicts.

The SHT30 temperature and humidity sensor communicates via I2C. In UIFlow, use the corresponding SHT30 block from the units palette. In Arduino, include the 'Adafruit SHT31' library, initialize the sensor object, and call `readTemperature()` and `readHumidity()` functions. In MicroPython, use the `sht3x` library. The sensor provides high-accuracy readings and is internally wired to the board's I2C bus, so no external wiring is required.