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Pololu Qik 2s9v1 Dual Serial Motor Controller

This small, inexpensive motor controller 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. Read more...

  • Description

This small, inexpensive motor controller 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 4.5 to 13.5 V; the continuous current per channel is up to 1 A (3 A peak). The logic supply can be as low as 2.7 V, 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.

Main Features of the Qik 2s9v1

  • 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’s guide.

Specifications

Motor channels: 2
Motor supply voltage: 4.5 – 13.5 V
Continuous output current per channel: 1 A
Peak output current per channel: 3 A
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

Sample Code

Pololu 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.