Waveshare ST3215 servo drive

Order the powerful Waveshare ST3215 servo with UART control for your drone!

Provide precise and intelligent control of your drone's actuators. The Waveshare ST3215 servo drive is a new generation of electromechanical devices with an intelligent control system and digital feedback. With a built-in 12-bit magnetic encoder, it provides precision positioning with a resolution of 4096 steps per full revolution .

UART serial bus control allows up to 253 of these servos to be networked, ideal for complex robotics and drones. Powerful torque of 30 kg/cm2 with 12V power allows you to confidently control load release mechanisms and rotary hangers.

• High torque 30 kg/cm. Develops force up to 30 kg/cm at a voltage of 12V, ensuring confident control of heavy mechanisms.

• Precision magnetic encoder. 12-bit resolution (4096 steps at 360°) guarantees exceptional positioning accuracy and wear-free .

• UART control over a common bus. Allows up to 253 servos to be connected and addressed in series via a single TTL interface.

• Two operating modes. Switch between 360° servo mode and stepper motor continuous rotation mode.

• Full feedback. Ability to read shaft position, load, speed and supply voltage in real time.

Operating principle and intellectual capabilities

Waveshare ST3215 is a digitally controlled servo drive based on a high-speed microcontroller and a high-precision magnetic encoder . Unlike traditional servos that use an analog potentiometer, the non-contact magnetic sensor eliminates mechanical wear and ensures consistent performance throughout its service life . Built-in electronics calculate in real time key operating parameters available for closed-loop systems: current shaft position, servo load, rotation speed and supply voltage .

A unique feature of the model is support for two operating modes, switchable at any time programmatically. In servo mode, the shaft rotates at a specified angle within 360°, which is ideal for positioning gimbals. In motor mode, it becomes a precision continuous-rotating stepper motor with an angular pitch of less than 0.09°, allowing it to be used to drive wheeled platforms or broaching mechanisms.

Each device is assigned a unique ID from 0 to 253, which allows you to create complex multi-element designs controlled over a single three-wire bus.

Technical characteristics and connection

To integrate a servo drive into a project, you will need a controller with UART support and a power supply of appropriate power. The manufacturer provides detailed documentation, libraries and code examples for popular platforms, including Arduino, which greatly simplifies development. The built-in soft start and brake function makes the movements of the mechanisms smoother and prevents jerking.

Applications for drones and robotics

Waveshare ST3215 is ideal for creating controlled cargo release systems for FPV drones, rotating mechanisms for professional gimbals, as well as for building robotic manipulators and walking platforms. The ability to daisy chain multiple servos and receive feedback makes it an essential component for complex projects that require precise control. The robust metal gearbox and high-quality housing materials guarantee durability even under intense loads.

Specifications 

• Torque: 30 kg cm at 12 V / 19.5 kg cm at 7.4 V
• Rotation Angle: 360° (0~4095)
• Position sensor resolution: 360° / 4096
• Limited angle mechanism: no restrictions
• Operating voltage: 6~12.6V
• Equipment: high precision metal gear
• No-load speed: 0.222 sec / 60° (45 rpm) at 12 V / 0.192 sec / 60° (52 rpm) at 7.4 V
• Encoder type: 360° magnetic encoder
• ID range: 0 ~ 253
• Baud rate: 38400bps ~ 1Mbps (1Mbps default)
• Feedback: position, load, speed, input voltage
• No-load current: 180 mA (at 12 V) / 150 mA (at 7.4 V)
• Rotor stall current: 2.7 A (at 12 V) / 2.5 A (at 7.4 V).