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Tic T825 USB Multi-Interface Stepper Motor Controller

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  • The Tic T825 USB Multi-Interface Stepper Motor Controller makes basic control of a stepper motor easy, with quick configuration over USB using our free software. The controller supports six control interfaces: USB, TTL serial, I²C, analog voltage (potentiometer), quadrature encoder, and hobby radio control (RC). This version incorporates a TI DRV8825 driver, and male headers and terminal blocks are included but not soldered. It can operate from 8.5 V to 45 V and can deliver up to approximately 1.5 A per phase without a heat sink or forced air flow (or 2.5 A max with sufficient additional cooling).

    The Tic family of stepper motor controllers makes it easy to add basic control of a bipolar stepper motor to a variety of projects. These versatile, general-purpose modules support six different control interfaces: USB for direct connection to a computer, TTL serial and I²C for use with a microcontroller, RC hobby servo pulses for use in an RC system, analog voltages for use with a potentiometer or analog joystick, and quadrature encoder for use with a rotary encoder dial. They also offer many settings that can be configured using our free configuration utility (for Windows, Linux, and macOS). This software simplifies initial setup of the device and allows for in-system testing and monitoring of the controller via USB (a micro-B USB cable is required to connect the Tic to a computer).

    The table below lists the members of the Tic family and shows the key differences among them.

    Features and specifications

    • Open-loop speed or position control of one bipolar stepper motor
    • A variety of control interfaces:
      • USB for direct connection to a computer
      • TTL serial operating at 5 V for use with a microcontroller
      • I²C for use with a microcontroller
      • RC hobby servo pulses for use in an RC system
      • Analog voltage for use with a potentiometer or analog joystick
      • Quadrature encoder input for use with a rotary encoder dial, allowing full rotation without limits (not for position feedback)
      • STEP/DIR inputs for compatibility with existing stepper motor control firmware
    • Acceleration and deceleration limiting
    • Maximum stepper speed: 50,000 steps per second
    • Very slow speeds down to 1 step every 200 seconds (or 1 step every 1428 seconds with reduced resolution).
    • Up to six different microstep resolutions:
      • The Tic T825, Tic T834, and T249 support full step, half step, 1/4 step, 1/8 step, 1/16 step, and 1/32 step
      • The Tic T500 supports full step, half step, 1/4 step, 1/8 step
    • Digitally adjustable current limit
    • Optional safety controls to avoid unexpectedly powering the motor
    • Input calibration (learning) and adjustable scaling degree for analog and RC signals
    • 5 V regulator (no external logic voltage supply needed)
    • Optional limit switch inputs with homing capabilities
    • Optional kill switch inputs
    • STEP/DIR outputs for controlling external stepper motor drivers
    • Connects to a computer through USB via a USB A to Micro-B cable (not included)
    • Free configuration software available for Windows, Linux, and macOS
    • Arduino library makes it easy to get started using these controllers with an Arduino or compatible board
    • Comprehensive user’s guide

    Details for item #3131

    The Tic T825 is based on the DRV8825 IC from Texas Instruments. It can operate from 8.5 V to 45 V and can deliver up to approximately 1.5 A per phase without a heat sink or forced air flow (absolute maximum is 2.5 A per phase). It has reverse protection for motor power supplies up to 40 V. This version is sold unassembled so soldering is necessary to use it.

    A version is also available that requires no soldering to use as the terminal blocks and main header pins are already installed.



    1.50″ × 1.05″ × 0.42″1


    5.1 g1

    General specifications


    Tic T825

    Motor driver:


    Control interface:

    USB; non-inverted TTL serial; I²C;
    RC servo pulses; analog voltage; quadrature encoder

    Minimum operating voltage:

    8.5 V

    Maximum operating voltage:

    45 V2

    Continuous current per phase:

    1.5 A3

    Maximum current per phase:

    2.5 A4

    Maximum step rate:

    50000 PPS

    Microstep resolutions:

    full, 1/2, 1/4, 1/8, 1/16, and 1/32

    Reverse voltage protection?:


    Connectors soldered?:


    Identifying markings

    PCB dev codes:


    Other PCB markings:



    • Without included optional hardware.
    • Reverse voltage protection only works up to 40 V.
    • Without a heat sink or forced air flow.
    • With sufficient additional cooling.
    • To -40 V. Connecting supplies over 40 V in reverse can damage the device.

    File downloads

    Recommended links

    Video: Getting Started with the Tic Stepper Motor Controllers

    Getting up and running with your Tic stepper motor controller from Pololu is easy. This video will guide you through the basic steps to connect your Tic to its software and control a stepper motor from your computer.

    Tic Stepper Motor Controller software source code

    This repository contains the source code of the Pololu Tic Command-line Utility (ticcmd) and the Pololu Tic Control Center (ticgui). It also has drivers for Windows and build instructions.

    Tic Stepper Motor Controller library for Arduino

    This is a library for the Arduino IDE that helps interface with a Tic Stepper Motor Controller using serial or I²C.

    I want to control a 3.9 V, 600 mA per phase bipolar stepper motor like this, but your Tic T825 stepper motor controller has a minimum operating voltage of 8.5 V. Can I use this controller without damaging the stepper motor?

    Yes. To avoid damaging your stepper motor, you want to avoid exceeding the rated current, which is 600 mA in this instance. The Tic T825 stepper motor controller has configurable current limiting, so you can set a limit that is appropriate for your stepper motor. As long as you set the limit below the rated current, you will be within spec for your motor, even if the voltage exceeds the rated voltage. The voltage rating is just the voltage at which each coil draws the rated current, so the coils of your stepper motor will draw 600 mA at 3.9 V. By using a higher voltage along with active current limiting, the current is able to ramp up faster, which lets you achieve higher step rates than you could using the rated voltage.

    If you do want to use a lower motor supply voltage for other reasons, consider using the Tic T500, which operates from 4.5 V to 35 V, or the Tic T834, which operates from 2.5 V to 10.8 V.

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