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Pololu

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1454-POLOLU Pololu Wheel 40×7mm Pair - White
CA$7.66
These white plastic wheels have silicone tires measuring 40 mm (1.57″) in diameter and press-fit onto the 3mm D output shafts on many of our motors, including our micro metal gearmotors and our mini plastic gearmotors. These wheels are sold in pairs.
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2257-POLOLU Stamped Aluminum L-Bracket for NEMA 14 Stepper Motors
CA$5.67
This black anodized aluminum bracket lets you securely mount typical NEMA 14-size stepper motors to your project. The bracket features several slots and holes for a variety of mounting solutions, and four M3×5mm screws are included for securing the motor to the bracket.
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2682-POLOLU 12mm Hex Wheel Adapter for 3mm Shaft (2-Pack)
CA$6.08
These 17 mm long aluminum adapters convert a 3 mm diameter shaft to a 12 mm hex shaft that compatible with many common hobby RC wheels. The set includes two adapters, two M4 screws for securing wheels to the adapters, four M3 set screws for securing the adapters to motor shafts, and one 1.5 mm Allen wrench for use with the set screws.
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2684-POLOLU 12mm Hex Wheel Adapter for 4mm Shaft (2-Pack)
CA$6.08
These 17 mm long aluminum adapters convert a 4 mm diameter shaft to a 12 mm hex shaft that compatible with many common hobby RC wheels. The set includes two adapters, two M4 screws for securing wheels to the adapters, four M3 set screws for securing the adapters to motor shafts, and one 1.5 mm Allen wrench for use with the set screws.
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2687-POLOLU 12mm Hex Wheel Adapter for 6mm Shaft, Extended (2-Pack)
CA$7.62
These 35 mm long aluminum adapters convert a 6 mm diameter shaft to a 12 mm hex shaft that compatible with many common hobby RC wheels. The set includes two adapters, two M4 screws for securing wheels to the adapters, four M3 set screws for securing the adapters to motor shafts, and one 1.5 mm Allen wrench for use with the set screws.
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2681-POLOLU Mini Plastic Gearmotor Bracket Pair - Tall
CA$6.08
These tall brackets offer an easy and convenient mounting solution for our mini plastic gearmotors. The white plastic bracket securely clasps around the gearmotor, and the mounting tabs capture the nuts for easy installation. These brackets are sold in pairs, and each bracket comes with two M3 screws, two nuts, and a spacer.
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2680-POLOLU Mini Plastic Gearmotor Bracket Pair - Wide
CA$6.08
These wide brackets offer an easy and convenient mounting solution for our mini plastic gearmotors. The white plastic bracket clasps securely around the gearmotor, and the mounting tabs capture the nuts for easy installation. These brackets are sold in pairs, and each bracket comes with two M3 screws, two nuts, and a spacer.
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2128-POLOLU A4988 Stepper Motor Driver Carrier, Black Edition
CA$21.75
This is a higher-performance drop-in replacement for the original A4988 stepper motor driver carrier. It features a four-layer PCB for better thermal performance, allowing the A4988 microstepping bipolar stepper motor driver to deliver approximately 20% more current than our two-layer (green) version.
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2475-POLOLU Carrier for Sharp GP2Y0A60SZLF Analog Distance Sensor, 5V
CA$4.54
This compact carrier board makes it easy to integrate a Sharp GP2Y0A60SZLF analog distance sensor (not included) into your project by providing all of the required external components and a 0.1″-pitch, four-pin interface to the sensor. This version of the carrier board is configured for 5V mode.
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2477-POLOLU Carrier for Sharp GP2Y0A60SZLF Analog Distance Sensor, 3V
CA$4.54
This compact carrier board makes it easy to integrate a Sharp GP2Y0A60SZLF analog distance sensor (not included) into your project by providing all of the required external components and a 0.1″-pitch, four-pin interface to the sensor. This version of the carrier board is configured for 3V mode.
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1036-POLOLU 0.100" (2.54 mm) Female Header: 2x17-Pin, Straight
CA$2.91
This connector is a double-row, 34-pin (2×17), straight female header strip designed to match 0.1" male headers.
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2745-POLOLU 0.100" (2.54 mm) Female Header: 2x13-Pin, Straight
CA$3.45
These 0.1" straight female header strips are commonly used as low-cost connectors for custom-made cables or perforated prototyping PCBs. The standard spacing is the same as on most solderless breadboardsand matches 0.1" male header strips. Our female headers are available in a variety of commonly used pin counts.
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1656-POLOLU 0.100" (2.54 mm) Female Header: 3x6-Pin, Straight
CA$2.30
This connector is a triple-row, 18-pin (3×6), straight female header strip designed to match 0.1" male headers.
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1658-POLOLU 0.100" (2.54 mm) Female Header: 3x7-Pin, Straight
CA$2.30
This connector is a triple-row, 21-pin (3×7), straight female header strip designed to match 0.1" male headers.
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2749-POLOLU Stackable 0.100″ Female Header with Extra 0.3″ Spacer: 2x20-pin, Straight
CA$4.98

This extra-tall stackable 40-pin female header features two rows of 20 pins spaced with a 0.1″ (2.54 mm) pitch. It includes three 0.1″-thick spacers for additional clearance, and the extended pins allow multiple units to be stacked as popularized on Arduino shields. 

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2676-POLOLU 25D mm Metal Gearmotor Bracket Pair
CA$11.46
These aluminum gearmotor brackets let you securely mount Pololu’s 25D mm metal gearmotors to your project. 
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2275-POLOLU 75:1 130RPM Metal Gearmotor 25Dx54L mm HP with 48 CPR Encoder
CA$56.85
This cylindrical, 2.62" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 74.83:1 metal gearbox to deliver a lot of power in a relatively small package.
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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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961-POLOLU QTR-8RC Reflectance Sensor Array
CA$15.31
This sensor module has 8 IR LED/phototransistor pairs mounted on a 0.375" pitch, making it a great detector for a line-following robot. 
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1929-POLOLU Crimping Tool: 0.08-0.5 mm² Capacity, 20-28 AWG
CA$53.78
This crimping tool can be used to crimp both male and female versions of our JST connector crimp pins, JR crimp pins, Futaba J crimp pins, and crimp pins for 0.1″ housings onto 20-28 AWG wires to make custom cables. The crimping die has a width of 4 mm, and the tool offers ratcheting action for increased consistency and ease of use.
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2285-POLOLU 47:1 120RPM Metal Gearmotor 25Dx52L mm with 48 CPR Encoder
CA$53.77
This cylindrical, 2.54" x 0.98" x 0.98" brushed DC gearmotor with a 46.85:1 metal gearbox is a lower-current alternative to the HP version. It has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 2249 counts per revolution of the gearbox’s output shaft.
Delivery within 2-3 weeks
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1438-POLOLU Wheel 90x10mm Pair - Blue
CA$9.15
These blue plastic wheels press-fit onto the 3mm D shafts on many of our motors, including our micro metal gearmotors and our plastic gearmotors with 3mm D-shafts, to make a nice drive solution for small robots.
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1427-POLOLU Wheel 70x8mm Pair - Yellow
CA$10.88
These yellow plastic wheels press-fit onto the 3mm D shafts on many of our motors, including our micro metal gearmotors and our plastic gearmotors with 3mm D-shafts, to make a nice drive solution for small robots.
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2572-POLOLU Adjustable 4-12V Step-Up/Step-Down Voltage Regulator S18V20ALV
CA$59.95
This powerful step-up/step-down regulator efficiently produces an adjustable 4 V to 12 V output from input voltages between 3 V and 30 V while allowing a typical output current of up to 2 A when the input voltage is close to the output voltage and offering typical efficiencies of 80% to 90%.
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2577-POLOLU 12V Step-Up/Step-Down Voltage Regulator S18V20F12
CA$41.19
This powerful step-up/step-down regulator efficiently produces a fixed 12 V output from input voltages between 3 V and 30 V while allowing a typical output current of up to 2 A when the input voltage is close to the output voltage and offering typical efficiencies of 80% to 90%.
Delivery within 2-3 weeks
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2576-POLOLU 9V Step-Up/Step-Down Voltage Regulator S18V20F9
CA$48.19
This powerful step-up/step-down regulator efficiently produces a fixed 9 V output from input voltages between 3 V and 30 V while allowing a typical output current of up to 2 A when the input voltage is close to the output voltage and offering typical efficiencies of 80% to 90%.
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2574-POLOLU 5V Step-Up/Step-Down Voltage Regulator S18V20F5
CA$41.19
This powerful step-up/step-down regulator efficiently produces a fixed 5 V output from input voltages between 3 V and 30 V while allowing a typical output current of up to 2 A when the input voltage is close to the output voltage and offering typical efficiencies of 80% to 90%.
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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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2561-POLOLU 3.3V Step-Up Voltage Regulator U1V11F3
CA$18.75
This compact (0.45″×0.6″) U1V11F3 switching step-up (or boost) voltage regulator efficiently generates 3.3 V from input voltages as low as 0.5 V. Unlike most boost regulators, the U1V11F3 offers a true shutdown option that turns off power to the load, and it automatically switches to a linear down-regulation mode when the input voltage exceeds the output.
Delivery within 2-3 weeks
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2512-POLOLU A4990 Dual Motor Driver Shield for Arduino
CA$16.29
This small shield is an easy, economical way to control two small brushed DC motors with an Arduino or Arduino-compatible board.
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2753-POLOLU DRV8835 Dual Motor Driver Kit for Raspberry Pi
CA$26.29
The DRV8835 Dual Motor Driver Kit for Raspberry Pi B+ provides an easy and low-cost solution for driving a pair of small brushed DC motors with a Raspberry Pi Model B+. The expansion board features Texas Instruments' DRV8835 dual H-bridge motor driver IC.
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1247-POLOLU MMA7341LC 3-Axis Accelerometer ±3/9g
1247-POLOLU MMA7341LC 3-Axis Accelerometer ±3/9g
CA$15.31
This tiny triple-axis accelerometer is a basic carrier board for the Freescale MMA7341LC XYZ-axis accelerometer, a great low-g sensor with analog voltage outputs and adjustable sensitivity (±3 g or ±9 g), and a 0g-detect digital output that signals when the board is in free-fall (±3 g sensitivity setting only).
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