Description
The FEETECH HLS3915M TTL Serial Bus Servo is a compact high-torque smart servo designed for robotic arms, quadruped robots, hexapod robots, grippers and other closed-loop robotic systems.
It features a durable metal housing, high-precision steel gear transmission and a 12-bit 360° magnetic encoder for accurate position feedback. Unlike conventional position-only servos, the HLS3915M supports multiple operating modes and provides real-time feedback including position, speed, current, input voltage, temperature and load information.
With up to 14 kg·cm torque at 12V, a 1:345 steel gear reduction system, dual-axis mechanical design and TTL serial bus communication, the HLS3915M is suitable for compact robotic joints requiring precise motion control and feedback.
The servo supports an operating voltage range of 4–14V, with 12V as the typical operating voltage. Its serial communication baud rate can be configured from 38,400 bps to 1 Mbps, with a factory default of 1 Mbps.
Key Features
- 14 kg·cm torque at 12V
- TTL serial bus communication
- 360° magnetic encoder
- 12-bit position resolution
- 0–4095 position range
- 0.088° position resolution
- Dual-shaft design
- High-precision steel gears
- 1:345 gear reduction ratio
- 4–14V operating voltage
- 100 RPM no-load speed at 12V
- Multiple control modes
- Adjustable speed and acceleration
- Position, speed, current, voltage, temperature and load feedback
- Configurable ID from 0–253
- Baud rate up to 1 Mbps
- Suitable for multi-servo robotic systems
Specifications
| Specification | HLS3915M / HL-3915-C001 |
|---|---|
| Product Type | TTL Serial Bus Smart Servo |
| Model | HLS3915M |
| Product Code | HL-3915-C001 |
| Rated Torque | 14 kg·cm @ 12V |
| Operating Voltage | 4–14V |
| Typical Voltage | 12V |
| Rotation Range | 360° |
| Position Range | 0–4095 |
| Position Resolution | 0.088° |
| Position Sensor | 12-bit 360° Magnetic Encoder |
| Mechanical Limit | Unlimited |
| Gear Type | High-Precision Steel Gears |
| Gear Ratio | 1:345 |
| No-Load Speed | 0.1 sec/60° @ 12V |
| No-Load Speed | 100 RPM @ 12V |
| No-Load Current | 260 mA |
| Stall Current | 1.5 A |
| Kt Constant | 9.3 kg·cm/A |
| Communication | TTL Serial Bus |
| Servo ID Range | 0–253 |
| Baud Rate | 38,400 bps–1 Mbps |
| Factory Default Baud Rate | 1 Mbps |
| Feedback | Load, Position, Speed, Current, Input Voltage, Temperature |
Dimensions
| Dimension | Size |
|---|---|
| Body Length | 34 mm |
| Body Width | 20 mm |
| Overall Width Including Output Sides | 29 mm |
| Main Body Depth | 23 mm |
| Output Mounting Diameter | Ø16 mm |
| Inner Reference Diameter | Ø12 mm |
| Output Mounting Holes | 8 × M2 |
| Housing Mounting Holes | 4 × M2 |
Note: Refer to the dimensional drawing for exact mounting positions and tolerances.
Control & Feedback
The HLS3915M is designed for closed-loop robotic control and can provide multiple feedback parameters through its TTL serial bus interface:
| Feedback Parameter | Supported |
|---|---|
| Position | Yes |
| Speed | Yes |
| Current | Yes |
| Input Voltage | Yes |
| Temperature | Yes |
| Load | Yes |
It can be used in applications requiring servo position control, constant-speed motor operation and torque-related control functions.
The programmable speed and acceleration settings allow smoother starting and stopping, helping reduce mechanical shock caused by sudden motion.
Applications
- Robotic Arms
- Robot Grippers
- Quadruped Robots
- Hexapod Robots
- Educational Robots
- Research Robots
- Mobile Robot Manipulators
- Multi-Axis Robot Joints
- DIY Robotics Projects
- Closed-Loop Automation Systems
Package Includes
- 1 × FEETECH HLS3915M Servo
- Connection cables
- Mounting screws
USB-to-TTL programming/communication adapter is not included unless purchased separately.
FAQ
What communication interface does the HLS3915M use?
The HLS3915M uses TTL serial bus communication and supports baud rates from 38,400 bps up to 1 Mbps.
Does the servo support 360° rotation?
Yes. It uses a 360° magnetic encoder with a 12-bit position range of 0–4095 and a resolution of approximately 0.088°.
What voltage should I use?
The specified operating range is 4–14V, with 12V listed as the typical operating voltage.
What feedback information is available?
The servo can provide position, speed, current, input voltage, temperature and load feedback.
Can multiple servos be connected to the same bus?
The servo provides programmable IDs from 0–253 for serial-bus applications.
Is the USB-to-TTL adapter included?
No. The FE-URT2-C001 USB-to-TTL adapter should be purchased separately unless specifically stated otherwise.
