Pololu Qik 2s9v1 Dual Serial Motor Controller

PololuSKU: POL-1110
Sale price £23
incl. VAT
excl. VAT
Only 3 units left

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This small, inexpensive motor controller from Pololu allows variable speed and direction control of two small, brushed DC motors using a simple serial interface, making it easy to add motors to your microcontroller- or computer-based project.

The motor supply voltage range is 4.5V to 13.5V; the continuous current per channel is up to 1A (3A peak). The logic supply can be as low as 2.7V, allowing operation with modern microcontrollers running at 3.3 V.

The qik 2s9v1 is Pololu’s second-generation dual serial motor controller. The compact module allows any microcontroller or computer with a serial port (external RS-232 level converter required) or USB-to-serial adapter to easily drive two small, brushed DC motors with full direction and speed control. It provides ultrasonic, 8-bit PWM speed control via an advanced, two-way serial protocol that features automatic baud rate detection up to 38.4 kbps and optional CRC error checking. Two status LEDs give visual feedback about the serial connection and any encountered error conditions, making debugging easy, and a demo mode allows easy verification of proper operation.

The improvements over the previous generation and competing products include:

  • High-frequency (ultrasonic) PWM to eliminate switching-induced motor shaft hum or whine
  • Robust, high-speed communication protocol with user-configurable error condition response
  • Visible LEDs and a demo mode to help troubleshoot problematic installations
  • Reverse power protection on the motor supply (not on the logic supply)

For a robot controller based on the qik’s driver, please consider the Baby Orangutan which connects the TB6612 to a user-programmable AVR microcontroller.

Note: The Pololu USB-to-serial adapter requires software drivers to operate; please see the resources section for more information. This product requires a USB A to mini-B cable (not included) to connect to a computer.


  • Simple bidirectional control of two DC brush motors
  • 4.5 V to 13.5 V motor supply range
  • 1 A maximum continuous current per motor (3 A peak)
  • 2.7 V to 5.5 V logic supply range
  • Logic-level, non-inverted, two-way serial control for easy connection to microcontrollers or robot controllers
  • Optional automatic baud rate detection
  • Two on-board indicator LEDs (status/heartbeat and serial error indicator) for debugging and feedback
  • Serial error output to make it easier for the main controller to recover from a serial error condition
  • Jumper-enabled demo mode allows initial testing without any programming
  • Optional CRC error detection eliminates serial errors caused by noise or software faults
  • Optional motor shutdown on serial error or timeout for additional safety
  • Supports daisy-chaining the qik to other qiks and Pololu serial motor and servo controllers, allowing the control of up to hundreds of motors and servos with a single serial line.
  • Comprehensive user guide.


Motor channels 2
Motor supply voltage 4.5 – 13.5 V
Continuous output current per channel 1A
Peak output current per channel 3A
Auto-detect baud rate range 1200 – 38400 bps
Fixed baud rate 38400 bps
Available PWM frequencies 31.5 kHz, 15.7 kHz, 7.8 kHz, 3.9 kHz
Logic supply voltage 2.7 – 5.5 V
Logic supply current < 15 mA
Reverse voltage protection? Y (on motor supply only)
Motor driver TB6612FNG
Size 0.70" x 1.20"
Weight 2g

Included Hardware

The qik ships with a 16×1 straight 0.100" male header strip, a 12×1 right angle 0.100" male header strip, and two red shorting blocks. This hardware offers several options when it comes to making connections to the qik.

For the most compact installation, wires can be directly soldered to the qik pins themselves. For less permanent connections, the 16×1 straight header strip can be broken into a 12×1 piece and two 2×1 pieces. The 2×1 pieces can optionally be soldered into the jumper pins, and the 12×1 header strip of your choice can be soldered into the qik control pins. This allows connections to the qik via custom-made cables that have female headers on them, or the qik can simply be plugged into a breadboard.

Using the right angle header allows for a compact profile or for vertical mounting into a breadboard; using the straight header allows for breadboarding as shown in the picture above.


Sample Code

We have written a basic Arduino library for the qik dual serial motor controllers that makes it simple to interface these controllers with an Arduino. The library handles the details of serial communication with the qik, allowing two brushed DC motors to be controlled easily.


Pin Type Function
DCD In "Data carrier detect" control input (active low)
DTR Out "Data terminal ready" control output (active low)
(often used with DSR)
DSR In "Data set ready" control input (active low)
(often used with DTR)
RTS Out "Ready to send" control output
(often used with CTS)
CTS In "Clear to send" control input
(often used with RTS)
GND Power Ground
TX Out Asynchronous serial data transmit (idle high)
VBUS Power USB bus voltage (+5V)
RX In Asynchronous serial data receive
SUSPEND  Out Driven high when in USB suspend state
SUSPEND  Out Driven low when in USB suspend state
RST In Device reset
RI In "Ring indicator" control input (active low)
VDD Power  3.3 V voltage regulator output

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