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Pololu

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3126-POLOLU Zumo 32U4 Robot (Assembled with 75:1 HP Motors)
CA$230.69
The Pololu Zumo 32U4 robot is a versatile tracked robot based on the Arduino-compatible ATmega32U4 MCU. It includes two 75:1 HP micro metal gearmotors along with integrated dual motor drivers, an LCD, quadrature encoders, line sensors, side and front proximity sensors for detecting objects, and a full IMU for detecting impacts and tracking orientation. The low-profile robot is less than 10 cm × 10 cm—small enough to qualify for Mini Sumo.
Delivery within 2-3 weeks
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2295-POLOLU Sanyo Miniature Stepper Motor: Bipolar, 200 Steps/Rev, 14×30mm, 6.3V, 0.3 A/Phase, Double Shaft
CA$184.55
This tiny bipolar stepping motor from Sanyo has a 1.8° step angle (200 steps/revolution). Each phase draws 300 mA at 6.3 V, allowing for a holding torque of 66 g-cm (0.92 oz-in). The motor has four color-coded wires terminated with bare leads: red and yellow connect to one coil; orange and blue connect to the other. It can be controlled by a pair of suitable H-bridges (one for each coil), but we recommend using a bipolar stepper motor driver.
Delivery within 2-3 weeks
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2507-POLOLU Dual VNH5019 Motor Driver Shield for Arduino
CA$175.74
This makes it easy to control two high-power DC motors with your Arduino or Arduino-compatible board. Its dual robust VNH5019 motor drivers operate from 5.5 to 24 V and can deliver a continuous 12 A (30 A peak) per motor, or a continuous 24 A (60 A peak) to a single motor connected to both channels.
Delivery within 2-3 weeks
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2294-POLOLU Sanyo Miniature Stepper Motor: Bipolar, 200 Steps/Rev, 14×30mm, 6.3V, 0.3 A/Phase
CA$169.16
This tiny bipolar stepping motor from Sanyo has a 1.8° step angle (200 steps/revolution). Each phase draws 300 mA at 6.3 V, allowing for a holding torque of 66 g-cm (0.92 oz-in). The motor has four color-coded wires terminated with bare leads: red and yellow connect to one coil; orange and blue connect to the other. It can be controlled by a pair of suitable H-bridges (one for each coil), but we recommend using a bipolar stepper motor driver.
Delivery within 2-3 weeks
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975-POLOLU 3pi Robot
975-POLOLU 3pi Robot
CA$153.77

The 3pi robot is a high performance platform featuring two micro metal gearmotors, five reflectance sensors, an 8×2 character LCD, a buzzer, and three user pushbuttons, all connected to a C-programmable ATmega328 microcontroller. Capable of speeds exceeding 3 feet per second, 3pi is a great first robot for ambitious beginners and a perfect second robot for those looking to move up from non-programmable or slower beginner robots.

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2510-POLOLU Zumo Robot for Arduino, v1.2 (Assembled with 75:1 HP Motors)
2510-POLOLU Zumo Robot for Arduino, v1.2 (Assembled with 75:1 HP Motors)
CA$153.77
This is an Arduino-controllable tracked robot platform that is less than 10 cm × 10 cm—small enough to qualify for Mini Sumo. It includes two micro metal gearmotors coupled to a pair of silicone tracks, a stainless steel bulldozer-style blade, an array of six infrared reflectance sensors for line following or edge detection, a buzzer for simple sounds and music, a 3-axis accelerometer, magnetometer, and gyro for detecting impacts and tracking orientation. 
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4990-POLOLU, Zumo 32U4 OLED Robot Kit (No Motors)
CA$149.95
The 4990-POLOLU is a robot kit to build the highly integrated Zumo 32U4. This product is based on an ATmega32U4. Its user programmable and highly customizable.
 
Delivery within 2-3 weeks
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2503-POLOLU Dual MC33926 Motor Driver Shield for Arduino
CA$136.73
This shield makes it easy to control two brushed DC motors with your Arduino or Arduino-compatible board. Its dual MC33926 motor drivers operate from 5 to 28 V and can deliver a continuous 3 A per motor. These great drivers also offer current-sense feedback and accept ultrasonic PWM frequencies for quieter operation. 
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2755-POLOLU Dual MC33926 Motor Driver for Raspberry Pi (Partial Kit)
CA$136.73
This add-on board enables a Raspberry Pi B+, A+, or Pi 2 to drive a pair of brushed DC motors. Its dual MC33926 motor drivers operate from 5 V to 28 V and can deliver a continuous 3 A (5 A peak) per motor.
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3575-POLOLU Balboa 32U4 Balancing Robot Kit (No Motors or Wheels)
CA$114.22
Build your very own programmable balancing robot with the Balboa 32U4 robot kit! The Balboa control board features an Arduino-compatible ATmega32U4 MCU, motor drivers, quadrature encoders, and a full IMU. This board also has the ability to interface with a Raspberry Pi, making the foundation for a complete Raspberry Pi-controlled balancing robot. Motors and wheels are not included: choose your wheels and motors to personalize your robot. The Balboa 32U4 is a small, user-programmable balancing robot based on the Arduino-compatible ATmega32U4 AVR microcontroller and featuring two H-bridge motor drivers, quadrature encoders for closed-loop motor control, a full inertial measurement unit (3-axis accelerometer, gyro, and magnetometer) for estimating orientation and balancing, and an optional interface for connecting a Raspberry Pi to make a Raspberry Pi-controlled balancing robot.
Delivery within 2-3 weeks
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2299-POLOLU Sanyo Pancake Stepper Motor: Bipolar, 200 Steps/Rev, 50×16mm, 5.9V, 1 A/Phase
CA$107.60
This pancake bipolar stepping motor from Sanyo has a 1.8° step angle (200 steps/revolution). It offers a holding torque of 2.2 kg-cm (30 oz-in), and each phase draws 1 A at 5.9 V. This stepper motor’s flat profile (21 mm including the shaft) allows it to be used in places where more traditional stepper motors would be too bulky.
Delivery within 2-3 weeks
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2994-POLOLU G2 High-Power Motor Driver 18v25
CA$98.81
This discrete MOSFET H-bridge motor driver enables bidirectional control of one high-power DC brushed motor. The small 1.3″ × 0.8″ board supports a wide 6.5 V to 30 V voltage range and is efficient enough to deliver a continuous 25 A without a heat sink. Additional features of this second-generation (G2) driver include reverse-voltage protection along with basic current sensing and current limiting functionality.
Delivery within 2-3 weeks
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2690-POLOLU Stepper Motor with 38cm Lead Screw: Bipolar, 200 Steps/Rev, 42×38mm, 2.8V, 1.7 A/Phase
CA$93.78
This NEMA 17-size hybrid bipolar stepping motor has an integrated 38 cm (15″) threaded rod as its output shaft, turning it into a linear actuator capable of precision open-loop positioning. The included traveling nut has four mounting holes and moves 40 µm (1.6 mil) per full step; finer resolution can be achieved with microstepping.
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2995-POLOLU G2 High-Power Motor Driver 24v21
CA$92.24
This discrete MOSFET H-bridge motor driver enables bidirectional control of one high-power DC brushed motor. The small 1.3″ × 0.8″ board supports a wide 6.5 V to 40 V voltage range and is efficient enough to deliver a continuous 21 A without a heat sink. Additional features of this second-generation (G2) driver include reverse-voltage protection along with basic current sensing and current limiting functionality.
Delivery within 2-3 weeks
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2298-POLOLU Sanyo Pancake Stepper Motor: Bipolar, 200 Steps/Rev, 42×11.6mm, 3.5V, 1 A/Phase
CA$92.22
This pancake bipolar stepping motor from Sanyo has a 1.8° step angle (200 steps/revolution). Each phase draws 1 A at 3.5 V, allowing for a holding torque of 850 g-cm (12 oz-in). The motor has four color-coded wires terminated with bare leads: red and yellow connect to one coil; orange and blue connect to the other. It can be controlled by a pair of suitable H-bridges (one for each coil), but we recommend using a bipolar stepper motor driver.
Delivery within 2-3 weeks
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