The M5Stack Extend I/O 2 Unit (EXT.IO2) is an IO extension unit, based on the STM32F030 main controller, using the I2C communication interface and providing 8 IO expansions. Each IO supports independent configuration of digital I/O, ADC, SERVO control and RGB LED control modes. Supports configuration of device I2C address, which means that users can mount multiple EXT.IO2 UNITs on the same I2C BUS to extend more IO resources. Suitable for multiple digital/analog signal acquisition, with lighting/servo control applications. Features * 8-channel input and output expansion: * Digital I/O * ADC input * SERVO control (PWM) * RGB LED control * I2C communication interface: * Supports configuration of I2C address Package Contents * 1x EXT.IO2 UNIT * 1x HY2.0 4-pin cable Specifications MCU STM32F030 I2C Address 0x45(default) Number of IO extensions 8 IO interface PIN spacing 2.54mm IOSupport Mode Digital input/output ADC SERVO control RGB LED control IO Input/Output Level Support 3.3V Net Weight 5g Gross Weight 13g Product Size 32*24*11mm Package Size 93*138mm Resources * Product Wiki * Schematic * Arduino Example * ADC Input * Digital Input/Output * RGB LED Control * Servo Control Pinout M5Core (PORT A) GPIO22 GPIO21 5V GND EXT.IO2 Unit SCL SDA 5V GND https://elecena.pl/product/22727648/m5stack-extend-i-o-2-unit-stm32f0 2023-03-07 https://elecena.pl/product/22727648/m5stack-extend-i-o-2-unit-stm32f0 2023-12-27 https://elecena.pl/product/22727648/m5stack-extend-i-o-2-unit-stm32f0 2024-09-18 https://elecena.pl/product/22727648/m5stack-extend-i-o-2-unit-stm32f0 2024-11-29 https://elecena.pl/product/22727648/m5stack-extend-i-o-2-unit-stm32f0 2024-11-30 https://elecena.pl/product/22727648/m5stack-extend-i-o-2-unit-stm32f0 2025-04-29 https://elecena.pl/product/22727648/m5stack-extend-i-o-2-unit-stm32f0 2025-08-06 https://elecena.pl/product/22727648/m5stack-extend-i-o-2-unit-stm32f0 2025-11-28 https://elecena.pl/product/22727648/m5stack-extend-i-o-2-unit-stm32f0 2025-11-29