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 soldered/ Unsoldered. 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 table below lists the members of the Tic family and shows the key differences among them.

Tic T834

Tic T825

Tic T249

Operating voltage range:	4.5 V to 35 V⁽¹⁾	2.5 V to 10.8 V	8.5 V to 45 V⁽¹⁾	10 V to 47 V⁽¹⁾
Max continuous current per phase (no additional cooling):	1.5 A	1.5 A	1.5 A	1.8 A
Peak current per phase (additional cooling required):	2.5 A	2 A	2.5 A	4.5 A
Microstep resolutions:	full half 1/4 1/8	full half 1/4 1/8 1/16 1/32	full half 1/4 1/8 1/16 1/32	full half 1/4 1/8 1/16 1/32
Automatic decay selection:
Automatic gain control (AGC):
Driver IC:	MP6500	DRV8834	DRV8825	TB67S249FTG
Price (connectors not soldered):	$19.95	$29.95	$29.95	$39.95
Price (connectors soldered):	$21.95	$31.95	$31.95	$41.95

The Tic T825 USB Multi-Interface Stepper Motor Controller is a versatile, general-purpose controller designed to control one bipolar stepper motor. With a variety of supported 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–and a wide array of configurable settings, the Tic T825 makes it easy to add basic control of a bipolar stepper motor to a variety of projects. A free configuration utility (for Windows, Linux, and macOS) simplifies initial setup of the device and allows for in-system testing and monitoring of the controller via

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.

Tic T825 USB Multi-Interface Stepper Motor Controller (without connectors soldered) with included headers and terminal blocks.

Tic T825 USB Multi-Interface Stepper Motor Controller (top view).

Tic T825 USB Multi-Interface Stepper Motor Controller (bottom view).

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).
Six different microstep resolutions: full step, half step, 1/4 step, 1/8 step, 1/16 step, and 1/32 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 kill switch inputs
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
Comprehensive user’s guide

Dimensions

Size:	1.50″ × 1.05″ × 0.42″¹
Weight:	5.1 g¹

General specifications

Motor driver:	DRV8825
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?:	Y⁵
Header pins soldered:	N