The M5Stack Unit 8Servos2-Chain provides eight configurable channels for servo control, digital I/O, ADC, PWM and RGB LEDs, with UART daisy-chain connectivity, 9-24V input and built-in current monitoring for multi-servo projects. The M5Stack Unit 8Servos2-Chain is an 8-channel servo cascade control unit with an integrated STM32G031G8U6 core controller. It adopts a UART communication interface and is compatible with the Chain series UART serial cascade communication protocol. It 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 serve as the input and output interfaces of the Chain series protocol, enabling chained connections of multiple 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, a DC power interface status indicator, and a HY2.0-4P interface undervoltage status indicator 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 * Adopts the Chain series UART serial cascade communication protocol * 2x HY2.0-4P interfaces support multi-device cascade * 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 detection * 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 UART @ Chain Series Communication Protocol (IN / OUT) DC Power Input Interface Input voltage: DC 9 ~ 24V, spec: 5.5 x 2.1mm, polarity: center 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@5.71mA Operating Power Consumption DC 12V@1.6A (8 servo loads) Product Size 56.0 x 24.0 x 11.5mm Product Weight 11.7g Resources * Documents Package Contents * 1x 8-Channel Servo2 Chain (STM32G031) * 1x HY2.0-4P Grove Cable (20cm)