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Tic Stepper Motor Controller library for Arduino
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Tic Stepper Motor Controller library for Arduino

Version: 2.0.0
Release date: 2019-02-06
Build Status


This is a library for the Arduino IDE that helps interface with a Tic Stepper Motor Controller (T500, T834, T825, T249) using serial or I²C.

Supported platforms

This library is designed to work with the Arduino IDE versions 1.8.x or later; we have not tested it with earlier versions. This library should support any Arduino-compatible board, including the Pololu A-Star controllers.

Getting started


The Tic Stepper Motor Controllers can be purchased from Pololu's website. Before continuing, careful reading of the Tic Stepper Controller User's Guide is recommended.

I2C connections

To control the Tic using I2C, you should connect your board's SCL pin to the Tic's SCL pin, connect your board's SDA pin to the Tic's SDA pin, and connect one of your board's GND pins to one of the Tic's GND pins.

Serial connections

To control the Tic using asynchronous TTL serial, you need to at least connect your board's TX pin (as defined in the table below) to the Tic's RX pin, and connect your board's GND pin to one of the Tic's GND pins. If you want to read information from the Tic (as is done in this library's SerialPositionControl example), you must also connect your board's RX pin (as defined in the table below) to the Tic's TX pin.

The example sketches for this library use a hardware serial port on your Arduino if one is available: if your Arduino environment defines SERIAL_PORT_HARDWARE_OPEN, the examples will use that port. The pins for this serial port are different depending on which Arduino you are using.

Microcontroller Board Hardware serial? MCU RX pin MCU TX pin
A-Star 32U4 Yes 0 1
A-Star 328PB Yes 12 11
Arduino Leonardo Yes 0 1
Arduino Micro Yes 0 1
Arduino Mega 2560 Yes 19 18
Arduino Due Yes 19** 18
Arduino Uno No 10 11
Arduino Yun No 10 11

** The Due's serial port is 3.3 V, so it should not be directly connected to the Tic's 5 V TX line. A voltage divider or level shifter can be used.

Tic configuration

Before using the example sketches, you should use the Tic Control Center software to apply these settings:

  • Control mode: Serial/I²C/USB.
  • Baud rate: 9600
  • CRC disabled
  • Device number: 14


You can use the Library Manager to install this library:

  1. In the Arduino IDE, open the "Sketch" menu, select "Include Library", then "Manage Libraries...".
  2. Search for "Tic".
  3. Click the Tic entry in the list.
  4. Click "Install".

If this does not work, you can manually install the library:

  1. Download the latest release archive from GitHub and decompress it.
  2. Rename the folder "tic-arduino-xxxx" to "Tic".
  3. Drag the "Tic" folder into the "libraries" directory inside your Arduino sketchbook directory. You can view your sketchbook location by opening the "File" menu and selecting "Preferences" in the Arduino IDE. If there is not already a "libraries" folder in that location, you should make the folder yourself.
  4. After installing the library, restart the Arduino IDE.


Several example sketches are available that show how to use the library. You can access them from the Arduino IDE by opening the "File" menu, selecting "Examples", and then selecting "Tic". If you cannot find these examples, the library was probably installed incorrectly and you should retry the installation instructions above.


The main classes provided by the library are listed below:

  • TicBase
  • TicSerial
  • TicI2C


For complete documentation of this library, see the tic-arduino documentation. If you are already on that page, then click the links in the "Classes" section above.

Version history

  • 2.0.0 (2019-02-06):
    • Removed the 2 ms delay inserted after I2C reads. This makes the library incompatible with Tic firmware versions 1.00 and 1.01.
    • Added support for the new Tic T249.
    • Added features to support limit switches and homing, which were added in Tic firmware version 1.06.
  • 1.2.1 (2018-03-19):
    • Fixed compilation errors in the SerialSpeedControl example.
  • 1.2.0 (2018-03-16):
    • Added support for the new Tic T500.
    • Added the I2CSetCurrentLimit example.
  • 1.1.0 (2017-11-02):
    • Added support for the new Tic T834.
    • Added the SerialMulti, I2CMulti, and I2CThreeButtons examples.
    • Added keywords.txt.
  • 1.0.1 (2017-07-25): Removed the call to haltAndSetPosition in the SerialSpeedControl example because it is not necessary.
  • 1.0.0 (2017-07-24): Original release.
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