The 24-channel Mini Maestro 24 raises the performance 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.
|1.10″ x 2.30″
|300 – 200000 bps 
|Minimum operating voltage:
|Maximum operating voltage:
|40 mA 
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 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, and 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.
Mini Maestro 12-channel USB servo controller (fully assembled) labeled top view.
Mini Maestro 12 power pins.
- Three control methods: USB, TTL (5V) serial, and internal scripting
- 0.25μs 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 to 333 Hz (2)
- Wide pulse range of 64 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 or 5 V)
- Analog or digital inputs (channels 0 – 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
- 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 (listed under the resources tab) allows use of more advanced native USB commands and includes example code in C#
- TTL serial features:
- Supports 300 – 200,000 bps in fixed-baud mode, 300 – 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
- Board can be powered off of USB or a 5 – 16 V battery, and it makes the regulated 5V available to the user
- Upgradable firmware
- 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
- Control a string of ShiftBrites from a computer for mood lighting
- General I/O expansion for microcontroller projects
- Programmable, self-contained Halloween or Christmas display controller that responds to sensors
- Self-contained servo tester
An example setup using a Micro Maestro to control a ShiftBar and Satellite LED Module is shown in the picture below and one of the videos above. Maestro source code to control a ShiftBar or ShiftBrite is available in the Example scripts section of the Maestro User’s guide.
- Pololu Micro Maestro Servo Controller User’s Guide: User’s guide for the Pololu Micro Maestro Servo Controller.
- Pololu USB Software Development Kit: The Pololu USB SDK contains the code you need for making your own applications that use native USB to control the USB AVR Programmer, Jrk Motor Controller, or the Maestro Servo Controller.
- Sample Project – Simple Hexapod Walker: This is a step-by-step tutorial showing you how to use the Pololu Micro Maestro to build a simple six-legged walking robot. The total parts cost is about $100.
- Maestro Servo Controller Windows Drivers and Software (release 130422): This ZIP archive contains the installation files for the Maestro Control Center, the Maestro command-line utility (UscCmd), and the Maestro drivers for Microsoft Windows.
- Maestro Servo Controller Linux Software (release 150116): This tar/gzip archive contains the binary executable files for the Maestro Control Center and the Maestro command-line utility (UscCmd) for Linux.
- Firmware version 1.01 for the Micro Maestro 6-Servo (usc02a): Use this file with the Maestro Control Center to upgrade your Micro Maestro’s firmware. This update contains a bug fix that will make “Ignore” mode work for servo channels. The update is recommended for devices with an earlier firmware version number, including all devices shipped before November 19,0 2009.
- Maestro Support for RoboRealm: The Pololu Maestro RoboRealm module provides a way to interface the visual processing of RoboRealm into servo movements using the Pololu Maestro USB Servo Controller. Released February, 2010.
- Paparazzi Autopilot for Linux: Patrick Hickey and Bradley Lord use a Pololu Micro Maestro for servo output and a Pololu 4 servo multiplexer to support manual control override in their model aircraft autopilot project. Published February, 2010.
- Obstacle Avoider: A simple obstacle-avoiding robot based on the Maestro, using continuous-rotation servos and distance sensors. The robot is programmed using the Maestro’s internal scripting language, without the need for an additional microcontroller. By TomatoWire, June 2010.
- Microsoft .NET Framework 3.5: The Microsoft .NET Framework version 3.5 is required for many Pololu configuration, control, and utility programs under Windows. Most computers will have this installed already or can automatically install it over the internet, but you can also get .NET 3.5 directly from Microsoft at this link. If you are installing on a computer without internet access, make sure to get the Full Redistributable Package.
- Micro Maestro and 12-channel Mini Maestro Cases: 3D models of cases that cover the bottom of the 6-channel Micro Maestro and 12-channel Mini Maestro servo controllers.