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Pololu

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954-POLOLU Ball Caster with 3/4″ Plastic Ball
US$6.14
This light ball caster uses a 3/4″ diameter plastic ball. The height of the assembled kit ranges from 0.9″ to 1.2″. Dowel pins are used to minimize the friction between the ball and the ABS housing.
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955-POLOLU Ball Caster with 3/4″ Metal Ball
US$4.90
This ball caster kit includes a black ABS housing, a 3/4″ diameter metal ball, two spacers (1/16″ and 1/8″ thick), and two #2 screw sets. The total height of the ball caster, 0.83″, can be increased to about 1″ using the included spacers. The two included #2 screws can be used to mount the ball caster to your chassis.
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2691-POLOLU Ball Caster with 1″ Plastic Ball and Plastic Rollers
US$5.53
This ball caster uses a 1″ diameter plastic ball and has an overall height of 1.1″ (29 mm). The two-part housing snaps together to securely enclose the ball and three plastic rollers that reduce the friction between the ball and the ABS housing. The base piece of the housing has holes for three #4 or M3 screws (not included).
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2692-POLOLU Ball Caster with 1″ Plastic Ball and Ball Bearings
US$9.73
This ball caster uses a 1″ diameter plastic ball and has an overall height of 1.1″ (29 mm). The two-part housing snaps together to securely enclose the ball and three ball bearings that minimize friction between the ball and the ABS housing. The base piece of the housing has holes for three #4 or M3 screws (not included).
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1969-POLOLU 0.1" (2.54mm) Crimp Connector Housing: 2x13-Pin 5-Pack
US$4.19
These 2×13-pin housings work with our wires with pre-crimped terminals to let you quickly make custom cables that mate with various 0.1"-spaced connectors, including male or female headers and solderless breadboards. They are sold in packs of 5.
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1989-POLOLU 0.1" (2.54mm) Crimp Connector Housing: 2x17-Pin 5-Pack
US$4.47
These 2×17-pin housings work with our wires with pre-crimped terminals to let you quickly make custom cables that mate with various 0.1"-spaced connectors, including male or female headers and solderless breadboards. They are sold in packs of 5.
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1990-POLOLU 0.1" (2.54mm) Crimp Connector Housing: 2x18-Pin 5-Pack
US$4.89
These 2×18-pin housings work with our wires with pre-crimped terminals to let you quickly make custom cables that mate with various 0.1"-spaced connectors, including male or female headers and solderless breadboards. They are sold in packs of 5.
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126-POLOLU 23201a Serial Adapter Fully Assembled
US$16.10
This deluxe serial port adapter (RS-232 adapter) converts logic-level signals to the higher voltages required for RS-232 and similar serial ports. Unlike competing units, the Pololu serial adapter operates over a 3-5.5 V supply range and gives you access to all eight of the signal lines available on a DB9 connector, including five transmit lines and three receive lines.
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3117-POLOLU A-Star 32U4 Robot Controller LV with Raspberry Pi Bridge
US$46.13
This programmable module combines with a Raspberry Pi to serve as the control center of a small robot or electronics project. Its Atmel ATmega32U4 microcontroller comes preloaded with an Arduino-compatible bootloader, and the board includes dual motor drivers that can deliver 1.8 A per channel to two brushed DC motors.
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3126-POLOLU Zumo 32U4 Robot (Assembled with 75:1 HP Motors)
US$209.93
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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1078-POLOLU Universal Aluminum Mounting Hub for 3mm Shaft, #4-40 Holes (2-Pack)
US$8.33
These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 3 mm diameter motor shafts. The set includes two hubs, two #4-40 set screws for securing the hubs to motor shafts, and one 0.05″ Allen wrench for use with the set screws. Each hub has four threaded mounting holes for #4-40 screws (not included).
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2755-POLOLU Dual MC33926 Motor Driver for Raspberry Pi (Partial Kit)
US$124.42
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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2564-POLOLU 5V Step-Up Voltage Regulator U1V10F5
US$38.92
This tiny (0.35″×0.45″) U1V10F5 switching step-up (or boost) voltage regulator efficiently generates 5 V from input voltages as low as 0.5 V. Unlike most boost regulators, the U1V10F5 automatically switches to a linear down-regulation mode when the input voltage exceeds the output.
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2748-POLOLU Stackable 0.100″ Female Header: 2x20-pin, Straight
US$4.44
This stackable 40-pin female header features two rows of 20 pins spaced with a 0.1″ (2.54 mm) pitch. The extended pins allow multiple units to be stacked as popularized on Arduino shields. The 2×20 size is notably used on the Raspberry Pi Models A+ and B+ as well as the Raspberry Pi 2 Model B.
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1037-POLOLU 0.100" (2.54 mm) Female Header: 2x20-Pin, Straight
US$1.75
This connector is a double-row, 40-pin (2×20), straight female header strip designed to match 0.1" male headers.
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