Roller485 Unit with BLDC Motor (STM32)

The Roller485 Unit is a brushless DC motor (BLDC) actuator kit made for efficient motion control. It supports both 6-16V DC input via the PWR485 interface and 5V input via the Grove connector, automatically adjusting power for optimal performance.

It has a FOC closed-loop drive system and a 3504 200KV motor, providing precise control of current, speed, and position. It includes a magnetic encoder for feedback, an OLED display for real-time status, RGB indicators, and LEGO-compatible mounting options. Ideal for robotics, industrial automation, and more, it supports RS485 and I2C communication with open-source hardware and software for flexible integration.

Note: The main difference between the Unit-Roller485 Lite and Unit-Roller485 is that the Lite version does not include the slip ring extended Grove connector or the top LEGO expansion interface.

To purchase the lite version, click here 

Features

• Brushless DC motor control (BLDC)
• RS-485 communication / I2C communication control
• Integrated OLED display
• RGB indicator lights
• FOC closed-loop drive system

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 Interface	PWR-485 (HT3.96-4P interface)
	I2C (0x64)
Display	0.66" OLED display, resolution: 64 x 48, SPI communication
RGB LEDs	2x WS2812-2020
Motor Power Supply	PWR-485 (HT3.96-4P interface) @ 6-16V
	Grove port DC5V power supply
	Slip ring_Grove port DC5V power supply
Load	Load: 50g Motor Speed: 2100rpm Current: DC16V/225mA
	Load: 200g Motor Speed: 1400rpm Current: DC16V/601mA
	Load: 500g Motor Speed: 560rpm Current: DC16V/918mA
	No load: DC16V/78mA
Standby Current	Grove port DC5V power supply @ 70mA
	RS-485 (HT3.96-4P interface) power supply DC16V @ 32mA
Output Torque	Grove port DC5V power supply: 0.021N.m/0.2kgf.cm @ current 350mA
	RS485 (VH3.96-4P interface) DC16V power supply: 0.065N.m/0.66kgf.cm @ current 927mA
Slip Ring (Grove Port) Output Capacity	DC5V/300mA
Noise	48dB
Operating Temperature	0-40°C
Product Size	40 x 40 x 40mm
Packaging Size	170 x 75 x 52mm
Product Weight	82.9g
Packaging Weight	158.1g

Resources

• Product Wiki
• Unit Roller485 Tutorial

Arduino Example Code

• Roller485 Unit Library
• STM32 Firmware

Package Contents

• 1x Roller485 Unit
• 1x HT3.96R-4P plug
• 2x HY2.0-4P Grove cables (5cm)
• 6x Friction pins
• 1x Flange
• 1x Bracket
• 1x Hex key(2.5mm)
• 1x Hex key(2mm)
• 6x M3 nuts
• 2x M3x14mm socket head screws
• 4x M3x14mm countersunk head screws
• 4x M3x12mm countersunk head screws
• 1x Single-end terminal wire 5P debugging cable