Description The M5Stack Roller485 is a brushless DC motor motion actuator unit with integrated control functions for efficient and precise motion control. It supports 6-16V DC input through the PWR485 interface or 5V input through the Grove interface, uses an STM32G431CBU6 MCU, and combines a built-in FOC closed-loop drive system, a 3504 200KV motor and magnetic encoder feedback for current, speed and position control. The M5Stack Roller485 includes an electrical slip ring so the top Grove interface can stay connected to the bottom during 360-degree rotation, allowing extra modules to be expanded on the rotating top section while maintaining power and data transmission. It also provides a 0.66-inch OLED display, RGB indicators, function buttons, LEGO-compatible mounting holes, M3 screw holes, SWD/SWO debugging interfaces and open-source hardware/software support. Note: The Lite version does not have the slip ring expansion Grove interface or the top LEGO expansion interface; this version includes those expansion features. Power supply notice: The power supply should not exceed 16V. If the voltage exceeds 18V, motor fault code E:1 is displayed, the motor stops working, "Over Voltage" is shown and the LED turns red. Encoder note: In absolute position mode, 36000 pos corresponds to 360 degrees. Because the mechanical installation angle and encoder angle may not be strictly aligned, an error of about 2 degrees may occur. Features Brushless DC motor control with a built-in FOC closed-loop drive system. RS485 and I2C communication control for motion control and parameter adjustment. 3504 200KV brushless motor with magnetic encoder feedback for current, speed and position triple-loop control. Electrical slip ring keeps the rotating top Grove interface connected during 360-degree rotation. 0.66-inch OLED display, RGB indicators and function buttons for local status and interaction. LEGO-compatible mounting holes and M3 screw holes on the top and base for quick integration. Open-source hardware and software with SWD and SWO debugging interfaces. Specifications MCU STM32G431CBU6 @ Cortex-M4, 128KB Flash, 32KB SRAM, 170MHz Motor Type D3504 200KV brushless motor, diameter 41mm Driver Chip DRV8311HRRWR Angle Sensor TLI5012BE1000 Communication Interfaces 1 x PWR-485 (HT3.96-4P interface), 2 x I2C (0x64) Display 0.66-inch OLED display, 64 x 48 resolution, SPI communication RGB LEDs 2 x WS2812-2020 Motor Power Supply PWR-485 (HT3.96-4P interface) @ 6-16V; Grove port DC 5V; slip ring Grove port DC 5V Load Data 50g: 2100rpm, DC 16V/225mA; 200g: 1400rpm, DC 16V/601mA; 500g max load: 560rpm, DC 16V/918mA; no load: DC 16V/78mA Standby Current Grove port DC 5V @ 70mA; RS-485 interface DC 16V @ 32mA Output Torque Grove port DC 5V: 0.021N.m / 0.2kgf.cm @ 350mA; RS485 power DC 16V: 0.065N.m / 0.66kgf.cm @ 927mA Slip Ring Grove Output DC 5V / 300mA Noise 48dB Operating Temperature 0 ~ 40°C Unit Size 40.0 x 40.0 x 40.0mm Unit Weight 82.9g Package Size 102.0 x 73.0 x 51.0mm Gross Weight 156.8g Applications Robotic joint control with a compact motor actuator unit. Smart manufacturing equipment requiring dual-bus motion control. Industrial automation prototypes and visual demonstration projects. Rotating mechanisms that need slip ring power and data continuity. Product List 1 x Unit Roller485 1 x HT3.96R-4P connector 2 x HY2.0-4P Grove cables (5cm) 6 x Friction pins 1 x Flange 1 x Bracket 1 x Hex key (2.5mm) 1 x Hex key (2mm) 6 x M3 nuts 2 x Hex socket head M3x14mm screws 4 x Hex socket countersunk M3x14mm screws 4 x Hex socket countersunk M3x12mm screws 1 x Single-ended terminal cable 1 x 5P debug cable Other Content The M5Stack Roller485 is designed for projects that need a ready-to-integrate actuator with onboard status display, feedback and control electronics. RS485 and I2C support makes it suitable for both multi-drop wired control and compact Grove-based control layouts. The slip ring Grove output provides DC 5V/300mA for top-side expansion modules during rotation. Resources Roller485 documentation Main schematic PDF Top expansion schematic PDF TLI5012BE1000 angle sensor datasheet DRV8311HRRWR motor driver datasheet Arduino library Internal firmware I2C protocol PDF RS485 protocol PDF UIFlow2 documentation FAQ What is this unit used for? It is used for robotic joint control, smart manufacturing equipment, industrial automation prototypes and visual demonstrations that need integrated motion control. How is this brushless DC motor unit controlled? This brushless DC motor unit supports motion control and parameter adjustment through RS485 and I2C buses. What is the power input range? The PWR485 interface supports 6-16V DC input, and the Grove interface supports 5V input. The power supply should not exceed 16V. What does the slip ring enable? The slip ring keeps the top Grove interface connected during 360-degree rotation and provides DC 5V/300mA for top-side expansion.
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