The M5Stack Unit 8Servos2-I2C provides eight configurable channels for servo control, digital I/O, ADC, PWM and RGB LEDs, with I2C connectivity, adjustable addressing, 9-24V input and built-in current monitoring for multi-servo projects. The M5Stack Unit 8Servos2-I2C is an 8-channel servo cascade control unit featuring the STM32G031G8U6 as its core controller. It adopts an I2C communication interface and provides 8 x configurable IO channels that support configuring multiple operating modes: servo control, digital input / output, ADC input, RGB LED control, and PWM mode. Two onboard HY2.0-4P interfaces are connected internally and share the same I2C bus, and a 16-position rotary encoder switch is provided for flexible configuration of the device I2C address, making it convenient to expand and connect other I2C devices. This unit supports DC 9 ~ 24V input and integrates an SY8303AIC step-down circuit to provide a 5V supply, with a maximum total output current of 3A. An onboard INA199A1DCKR current detection circuit can sample the total servo current, and input voltage and 5V supply voltage sampling circuits as well as power status indicators are also provided, making it suitable for application scenarios such as multi-servo control, robot joint drive, and smart toys. Features * STM32G031G8U6 core controller * 8x configurable IO channels supporting multiple operating modes: * Servo control * Digital input / output * ADC input * RGB LED control * PWM mode * Communication interface and address configuration * I2C communication interface * 2x HY2.0-4P interfaces for multi-I2C device expansion * 16-position rotary encoder switch for I2C address configuration * Power and detection * DC 9 ~ 24V power input, with an integrated 5V@3A step-down circuit (peripheral drive + HY2.0-4P output to power the controller) * Integrated total servo current monitoring * DC input voltage detection * 5V supply voltage detection * Status indication * Red indicator: DC power interface status indicator (lights up when the interface voltage is higher than 8.5V) * Green indicator: HY2.0-4P interface undervoltage status indicator (lights up when the interface voltage is lower than 4.5V) Specifications MCU STM32G031G8U6 Configurable IO Channels 8, supports operating modes: servo control, digital input / output, ADC input, RGB LED, PWM mode IO Channel Interface 8 x 2.54-3P Communication Interface I2C @ 0x25 ~ 0x34 DC Power Input Interface Input voltage: DC 9 ~ 24V, spec: 5.5 x 2.1mm, polarity: centre positive, outer negative Step-Down Chip SY8303AIC Power Output DC 5V, max 3A (shared by all onboard loads) Current Detection Circuit INA199A1DCKR, paired with a 10mΩ sampling resistor Indicator Red DC input monitoring indicator, green undervoltage monitoring indicator Standby Power Consumption DC 12V@4.56mA Operating Power Consumption DC 12V@1.6A (8 servo loads) Product Size 56.0 x 24.0 x 11.5mm Product Weight 11.6g Resources * Documents Package Contents * 1x 8-Channel Servo2 I2C Unit (STM32G031) * 1x HY2.0-4P Grove Cable (20cm)