Pololu Mini Maestro 24-Channel USB Servo Controller (Assembled)

The Pololu 24-channel Mini Maestro 18 raises the bar for serial servo controllers with features such as a native USB interface and internal scripting control. Whether you want the best servo control available (0.25μs resolution with built-in speed and acceleration control and pulse rates up to 333 Hz) or a general I/O controller (e.g. to interface with a sensor or ESC via your USB port), this compact, versatile device will deliver.

This fully-assembled version ships with header pins installed.

Getting started with the Maestro Servo Controller

Overview

The Mini Maestros are the newest of Pololu’s second-generation USB servo controllers, offering more channels and features than the smaller six-channel Micro Maestro. The Mini Maestros are available in three sizes:

• Mini Maestro 12 — fully assembled
• Mini Maestro 18 — fully assembled
• Mini Maestro 24 — fully assembled (this item)

The Mini Maestros are highly versatile (and compact) servo controllers and general-purpose I/O boards. They support three control methods: USB for direct connection to a computer, TTL serial for use with embedded systems, and internal scripting for self-contained, host controller-free applications.

The channels can be configured as servo outputs for use with radio control (RC) servos or electronic speed controls (ESCs), as digital outputs, or as analog/digital inputs. The extremely precise, high-resolution servo pulses have a jitter of less than 200 ns, making these servo controllers well suited for high-performance applications such as robotics and animatronics. Built-in speed and acceleration control for each channel make it easy to achieve smooth, seamless movements without requiring the control source to constantly compute and stream intermediate position updates to the Mini Maestros.

The Mini Maestros also feature configurable pulse rates from 1 to 333 Hz and can generate a wide range of pulses, allowing maximum responsiveness and range from modern servos. Units can be daisy-chained with additional Pololu servo and motor controllers on a single serial line.

A free configuration and control program is available for Windows and Linux, making it simple to configure and test the device over USB, create sequences of servo movements for animatronics or walking robots, and write, step through, and run scripts stored in the servo controller. The Mini Maestros’ 8 KB of internal script memory allows storage of up to approximately 3000 servo positions that can be automatically played back without any computer or external microcontroller connected.

Because the Mini Maestros’ channels can also be used as general-purpose digital outputs and analog or digital inputs, they provide an easy way to read sensors and control peripherals directly from a PC over USB, and these channels can be used with the scripting system to enable the creation of self-contained animatronic displays that respond to external stimuli and trigger additional events beyond just moving servos.

These fully assembled versions of the Mini Maestro ship with 0.1″ male header pins installed as shown in the product pictures. A USB A to mini-B cable (not included) is required to connect this device to a computer. The Micro and Mini Maestros have 0.086″ diameter mounting holes that work with #2 and M2 screws.

Main Features

• Three control methods: USB, TTL (5 V) serial, and internal scripting
• 0.25 μs output pulse width resolution (corresponds to approximately 0.025° for a typical servo, which is beyond what the servo could resolve)
• Pulse rate configurable from 1 Hz to 333 Hz ⁽²⁾
• Wide pulse range of 64 μs to 4080 μs ⁽²⁾
• Individual speed and acceleration control for each channel
• Channels can be optionally configured to go to a specified position or turn off on startup or error
• Alternate channel functions allow the channels to be used as:
  • General-purpose digital outputs (0 V or 5 V)
  • Analog or digital inputs (channels 0 to 11 can be analog inputs; channels 12+ can be digital inputs)
  • One channel can be a PWM output with frequency from 2.93 kHz to 12 MHz and up to 10 bits of resolution
• A simple scripting language lets you program the controller to perform complex actions even after its USB and serial connections are removed
• Comprehensive user’s guide
• Free configuration and control application for Windows and Linux makes it easy to:
  • Configure and test your controller
  • Create, run, and save sequences of servo movements for animatronics and walking robots
  • Write, step through, and run scripts stored in the servo controller
• Two ways to write software to control the Maestro from a PC:
  • Virtual COM port makes it easy to send serial commands from any development environment that supports serial communication
  • Pololu USB Software Development Kit allows use of more advanced native USB commands and includes example code in C#, Visual Basic .NET, and Visual C++
• TTL serial features:
  • Supports 300 bps to 200,000 bps in fixed-baud mode, 300 bps to 115,200 bps in autodetect-baud mode ⁽²⁾
  • Simultaneously supports the Pololu protocol, which gives access to advanced functionality, and the simpler Scott Edwards MiniSSC II protocol (there is no need to configure the device for a particular protocol mode)
  • Can be daisy-chained with other Pololu servo and motor controllers using a single serial transmit line
  • Chain input allows reception of data from multiple Mini Maestros using a single serial receive line without extra components (does not apply to Micro Maestros)
  • Can function as a general-purpose USB-to-TTL serial adapter for projects controlled from a PC
• Our Maestro Arduino library makes it easier to get started controlling a Maestro from an Arduino or compatible boards like our A-Stars
• Board can be powered off of USB or a 5 V to 16 V battery, and it makes the regulated 5 V available to the user
• Upgradable firmware

Application Examples and Videos

• Serial servo controller for multi-servo projects (e.g. robot arms, animatronics, fun-house displays) based on microcontroller boards such as the BASIC Stamp, Orangutan robot controllers, or Arduino platforms
• Computer-based servo control over USB port
• Computer interface for sensors and other electronics:
  • Read a gyro or accelerometer from a computer for novel user interfaces
• General I/O expansion for microcontroller projects
• Programmable, self-contained Halloween or Christmas display controller that responds to sensors
• Self-contained servo tester

Specifications

Channels:	24
Baud:	300 – 200000 bps
Minimum operating voltage:	5 V
Maximum operating voltage:	16 V
Supply current:	40 mA
Partial kit?:	N

Resources

• Click here to view all resources
  • User Guide
  • Getting Started with the Maestro Servo Controller
  • Windows Drivers & Software
  • Linux Software
  • Pololu USB Software Development Kit
  • Arduino Library
  • C++ Serial Interface library