FEETECH Serial Servo - Product Introduction

FEETECH serial bus servos are high-performance, cost-effective servo solutions designed for robotics, automation, and DIY projects. They utilize the custom FT-SCS communication protocol, supporting both TTL single-bus and RS485 communication methods, allowing multiple servos to be controlled via a single bus.

Key Features

Communication Protocol

• Dual Communication Support: Compatible with TTL level (high-speed) and RS485 (strong anti-interference) communication methods
• Async Duplex Communication: Uses a question-and-answer interaction model between controller and servo
• Multi-Servo Bus Control: Up to 254 servos can be connected on a single bus, each with a unique ID (0-253)
• Default Configuration: 1M baud rate, 8 data bits, 1 stop bit, no parity
• Broadcast Control: ID 254 can be used to send commands to all servos simultaneously

Control Modes

• Position Servo Mode: Precise position control with 0.087° resolution
• Constant Speed Mode: Smooth speed control for continuous rotation applications
• PWM Open-loop Mode: Direct PWM control for custom speed regulation
• Stepping Mode: Step-based position control for precision applications

Protection & Monitoring

• Over-temperature protection
• Over-voltage/under-voltage protection
• Over-current protection
• Load overload protection
• Real-time feedback of position, speed, load, voltage, and temperature

Basic Control Example

Below is a simple Python example demonstrating how to control a FEETECH servo via serial port:

import serial
import time

# Initialize serial port
ser = serial.Serial('COM3', 1000000, timeout=1)  # Adjust COM port as needed

def calculate_checksum(data):
    """Calculate checksum for SCS protocol"""
    checksum = sum(data)
    return (~checksum) & 0xFF

def ping_servo(servo_id):
    """Ping servo to check connection"""
    command = [0xFF, 0xFF, servo_id, 0x02, 0x01]
    checksum = calculate_checksum(command[2:])
    command.append(checksum)
    ser.write(bytearray(command))
    response = ser.read(6)
    return len(response) > 0

def set_servo_position(servo_id, position, speed=1000):
    """Set servo target position with specified speed"""
    # Position: 0-4095 corresponds to 0-360° (adjust based on your servo model)
    # Speed: steps per second
    pos_low = position & 0xFF
    pos_high = (position >> 8) & 0xFF
    speed_low = speed & 0xFF
    speed_high = (speed >> 8) & 0xFF
    
    command = [0xFF, 0xFF, servo_id, 0x09, 0x03, 0x2A, 
               pos_low, pos_high, 0x00, 0x00, speed_low, speed_high]
    checksum = calculate_checksum(command[2:])
    command.append(checksum)
    ser.write(bytearray(command))
    response = ser.read(6)
    return response

# Example usage
if __name__ == "__main__":
    servo_id = 1
    
    # Check if servo is connected
    if ping_servo(servo_id):
        print(f"Servo ID {servo_id} connected successfully")
        
        # Move servo to position 2048 (middle position, approximately 180°) at 1000 steps/sec
        set_servo_position(servo_id, 2048, 1000)
        print(f"Servo moving to position 2048")
        
        time.sleep(2)
        
        # Move servo to position 0 (minimum position, approximately 0°) at 500 steps/sec
        set_servo_position(servo_id, 0, 500)
        print(f"Servo moving to position 0")
    else:
        print(f"Failed to connect to servo ID {servo_id}")
    
    ser.close()

Memory Table Overview

FEETECH servos feature a comprehensive memory table structure for configuration and status monitoring:

Common Commands

More Resources

• JuxiTechnology github
• Lark Wiki