ST3215 30kg Serial Bus Servo

The ST3215 is a powerful and intelligent Serial Bus Servo for demanding robotics and automation applications. With a rated voltage of 12 V, it delivers an impressive torque of up to 30 kg·cm, making it ideal for high-power applications. A durable coreless motor combined with a high-strength metal gearbox ensures high efficiency, precise control, and reliable continuous operation. The heart of the servo is a high-precision 12-bit magnetic encoder, providing absolute position feedback over the entire 360° rotational range with a resolution of 0.088°. The contactless sensor technology eliminates mechanical wear and offers a significantly longer lifespan than traditional potentiometers. Communication is via a half-duplex UART protocol, allowing up to 253 servos to be daisy-chained on a single port. Four different operating modes, as well as extensive real-time feedback and built-in protection functions, make the ST3215 a professional solution for precise and safe motion control.

Recommended Accessories:

• Serial Bus Servo Driver Adapter (A) USB/UART
• Serial Bus Servo Driver HAT
• ESP32 Serial Bus Servo Driver Expansion Board

Features:

• 12-bit magnetic encoder for 360° absolute positioning with 0.088° resolution
• High torque of 30 kg·cm thanks to coreless motor and metal gearbox
• Serial bus chaining of up to 253 servos on one UART port
• Four operating modes for angle servo, open and closed speed control, and step mode
• Real-time feedback on position, load, voltage, current, and temperature
• Comprehensive electronic protection functions for safe continuous operation
• One-click midpoint calibration for flexible null point definition

Application Examples:

• Multi-axis robotic arms for pick-and-place applications
• Quadruped walking robots with precise leg control
• Humanoid robots with complex motion sequences
• Educational robots for STEM instruction and university projects
• Automated sorting systems and industrial applications

Documentation:

• Github – ST3215 Serial Bus Servo

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SER0070
• Rated voltage: 12 V
• Operating voltage: 4–14 V
• No-load speed: 0.222 s/60° (45 RPM)
• No-load current: 180 mA
• Stall torque: 30 kg·cm (417.35 oz·in)
• Stall current: 2.7 A
• Standby current: 30 mA
• Rated load: 10 kg·cm
• Rated current: 900 mA
• Motor resistance: 1 Ω
• Torque constant: 11 kg·cm/A
• Encoder: 12-bit magnetic encoder
• Resolution: 0.088° (4096 steps)
• Rotation range: 360°
• Protocol: Half-duplex UART, 8 bit, 1 stop bit, no parity
• ID range: 0–253
• Baud rate: 38.4 kbps to 1 Mbps (standard 1 Mbps)
• Control: PID
• Gear material: Copper and aluminum
• Gear ratio: 1:345
• Gear backlash: ≤0.5°
• Bearings: Ball bearings
• Housing material: PA+GF
• Output shaft: 25T, outer diameter 5.9 mm
• Motor type: Coreless
• Operating temperature: -10 to +60 °C
• Storage temperature: -30 to +80 °C
• Motor noise: 45 ±5 dB
• Servo noise: 65 ±5 dB
• Lifespan under load: >100,000 cycles
• Product dimensions: 45.2 × 24.7 × 35 mm
• Product weight: 55 g
• Package dimensions: 59 × 57 × 38 mm
• Gross weight: 77 g

Scope of Delivery:

• 1 × ST3215 Serial Bus Servo
• 1 × Servo horn screw accessory kit
• 1 × 3-pin servo cable