This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 5 V. The board measures only 0.7″ × 0.8″, but it allows a typical continuous output current of up to 5 A. Typical efficiencies of 85% to 95% make this regulator well suited for high-power applications like powering motors or servos.

Snap-Action Switch with 16.3mm Roller Lever: 3-Pin, SPDT, 5A

15:1 Micro Metal Gearmotor. Pololu 4782

15:1 Micro Metal Gearmotor. Pololu 4780

6-pin female JST SH-type connector that works with Micro Metal Gearmotor Encoders. Pololu 4764

A set of two Pololu wheels with dimensions 70x8mm in black. Intended for Standard servos with 5.8mm diameter spline and 25 teeth. Pololu 4925

Ultrasonic distance sensor MB1020 with a range from 0 to 645 cm. It has an output in the form of a serial interface, analog signal or generates an impulse whose duration is proportional to the measured distance. Pololu 792

This gearmotor is a miniature high-power, 6 V brushed DC motor with long-life carbon brushes and a 297.92:1 metal gearbox. It has a cross section of 10 × 12 mm, and the D-shaped gearbox output shaft is 9 mm long and 3 mm in diameter.

Pololu high power miniature motor with carbon brushes. 380:1 gear motor, shaft speed 85 rpm, torque 5kg*cm. The motor has an extended shaft, which makes it easy to attach the encoder. Pololu 4799

This sensor is a carrier/breakout board for ST’s VL53L0X laser-ranging sensor, which measures the range to a target object up to 2 m away.

Pololu high power miniature motor with carbon brushes. 75:1 gear motor, shaft speed 450 rpm, torque 1kg*cm. The motor has an extended shaft, which makes it easy to attach the encoder. Pololu 3051

Pololu - 1524

These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 8 mm diameter motor shafts. The set includes two hubs, four M3 set screws for securing the hubs to motor shafts, and one 1.5 mm Allen wrench for use with the set screws.

Nylon Spacer: 2mm Length, 4mm OD, 2.7mm ID (50-Pack)

Aluminum Standoff: 1/2" Length, 4-40 Thread, F-F (4-Pack)

This breadboard-compatible module is an alternative to bulky power switches. It uses a small integrated slide switch to control a high-side power MOSFET that can deliver continuous currents up to around 8 A at 4.5 V to 40 V. Pololu 2814

This tiny, cylindrical gearmotor consists of a coreless brushed DC motor and a 700:1 plastic planetary gearbox. The entire assembly has a diameter of just 6 mm (0.24″) and an extremely light weight of 1.3 g (0.046 oz), making it a great actuator for miniature robots and very small mechanisms.

Module with 1 QTRX type optocoupler with RC (digital) output. The module operates from 2.9 V to 5.5 V, detects objects at a distance of up to 30 mm. The sensor will be used in projects that require detection of changes in the ground, e.g. in linefollower robots. Pololu 4341

DC-DC Step-Up converter U3V40F5 with an output voltage of 5 V, an input voltage of 1.3 to 5 V and a maximum output current of 4 A. Pololu 4012

DC-DC Step-Up converter U3V40F7 with an output voltage of 7.5 V, an input voltage of 1.3 to 7.5 V and a maximum output current of 4 A. Pololu 4014