M5Stack Scroll Unit w/ Hollow Shaft Encoder & RGB LED (EC10E1220501)

Connect the unit's Grove cable to an I2C port on your host board (e.g., M5Stack Core, Arduino). The default I2C address is 0x40. Use libraries like M5Stack's Unit library or Generic Wire.h to read registers for encoder counts (incremental/decremental values) and button state (pressed/released). The onboard STM32 handles quadrature decoding, so you receive clean integer data without managing interrupt routines for the encoder phases.

The default I2C address is fixed at 0x40 and is not user-configurable. The integrated WS2812C RGB LED is addressable and controlled via a dedicated data line, not through I2C. You must connect its signal pin (if broken out) to a GPIO capable of NeoPixel library timing. Refer to the unit's pinout diagram. The LED can be programmed using libraries like Adafruit_NeoPixel to display colors based on encoder position or system status.

The raw EC10E encoder produces AB-phase quadrature signals requiring firmware to count pulses and determine direction. This unit's STM32 microcontroller reads these signals internally, accumulates the count, and makes the net value available via I2C. This simplifies your code—you read a single register for the encoder position and another for the button, eliminating complex interrupt-driven decoding and debouncing routines for the AB phases directly.