ST3215 19.5kg Serial Bus Servo

The ST3215 is an intelligent and powerful serial bus servo for advanced robotics and automation applications. At an operating voltage of 7.4V, it delivers torque of up to 19.5 kg·cm, making it ideal for medium to demanding load applications. The TTL serial bus interface allows control of up to 253 servos via a single port, significantly reducing wiring complexity in complex multi-axis systems. A high-precision 12-bit magnetic encoder allows absolute 360° positioning with a resolution of 0.088° or 4096 steps, making it significantly more accurate than conventional potentiometers. The contactless sensor technology prevents mechanical wear, ensuring long service life. Four different operating modes and comprehensive real-time feedback on position, load, voltage, current, and temperature make the ST3215 a professional solution for precise motion control in continuous operation.

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
• Torque of 19.5 kg·cm at 7.4V for medium to demanding load applications
• Serial bus enables chaining of up to 253 servos on a single UART port
• Four operating modes for angle servo, motor operation, and step mode
• Real-time feedback for position, load, voltage, current, and temperature
• Operation with 2S LiPo batteries for mobile robot applications

Application Examples:

• Multi-axis robotic arms for education and prototyping
• Quadruped walking robots with precise leg kinematics
• Humanoid robots with complex joint movements
• Educational robots for STEM education and university projects
• Automated grippers and manipulators

Documentation:

• Github – ST3215 Serial Bus Servo

Technical Specifications:

• Manufacturer: DFRobot
• Manufacturer SKU: SER0069
• Operating Voltage: 4-7.4V
• No-load speed: 0.238s/60° (42 RPM) at 6V; 0.192s/60° (52 RPM) at 7.4V
• No-load current: 130mA at 6V; 150mA at 7.4V
• Stall torque: 16.5 kg·cm at 6V; 19.5 kg·cm at 7.4V
• Stall current: 2A at 6V; 2.4A at 7.4V
• Standby current: 6mA
• Rated load: 4 kg·cm at 6V; 5 kg·cm at 7.4V
• Rated current: 500mA at 6V; 600mA at 7.4V
• Motor resistance: 2.5Ω
• Torque constant (Kt): 8 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 (default: 1 Mbps)
• Control: PID
• Gear material: Copper and aluminum
• Gear ratio: 1:345
• Gear backlash: ≤0.5°
• Bearings: Ball bearings
• Housing: PA+GF
• Output shaft: 25T/OD 5.9mm
• Motor type: Coreless
• Operating temperature: -20 to +60°C
• Storage temperature: -30 to +80°C
• Motor noise: 45±5 dB
• Servo noise: 60±5 dB
• Lifespan under load: >100,000 cycles
• Product dimensions: 45.2×24.7×35mm
• Product weight: 55g
• Package dimensions: 59×57×38mm
• Gross weight: 76g

Package Contents:

• 1× ST3215 Serial Bus Servo
• 1× Servo Horn Screw Accessory Kit
• 1× 3-Pin Servo Cable