This electromagnetic transducer is a compact way to add sound to your embedded project. Pololu 1484

The kit uses a magnetic disc and hall effect sensors to provide 12 counts per revolution of the motor shaft. The sensors operate from 2.7 V to 18 V and provide digital outputs that can be connected directly to a microcontroller or other digital circuit. Compatible with all of the dual-shaft micro metal gearmotors we carry, including the HPCB versions. Pololu 3081

The very small step-down 6 V, 2.5 A synchronous inverter can be supplied with voltage up to 36 V, dimensions: 17.8 mm x 17.8 mm. Pololu 2859

Black polyurethane scooter/skate wheel 144 × 29 mm, works with standard 608 bearings. Pololu 3281

Pololu - 2737

Atmel ATmega32U4 microcontroller comes preloaded with an Arduino-compatible bootloader, and the board includes dual motor drivers that can deliver 1.7 A per channel to two brushed DC motors. Pololu 3119

The core of a small robot, either as an auxiliary controller atop a Raspberry Pi base or as a complete control solution on its own. Its Atmel ATmega32U4 microcontroller comes preloaded with an Arduino-compatible bootloader. This version does not include any through-hole components or connectors, allowing for customized assembly or standalone use. Pololu 3118

DRV8825 Stepper Motor Driver Carrier is a DRV8825 stepper motor driver that allows you to supply a bipolar current of up to 1.5 A per phase, without using a heat sink. The system can be supplied with voltage up to 45V, in the set there is a heat sink. It is compatible with Polol 2133

The stepper motor driver with Allegro A4988 (A4988 Stepper Motor Driver Carrier) allows you to supply a bipolar current of up to 2A per phase. The system can be supplied with voltage up to 35V, in the set there is a heat sink. It is compatible with Polol 1182

Tiny, cylindrical gearmotor consists of a coreless brushed DC motor and a 136:1 plastic planetary gearbox. 500 RPM and 45 mA free-run, 8 oz-in (0.6 kg-cm) and 400 mA stall. Pololu 2358

Black Edition offers adjustable current limiting, over-current and over-temperature protection, and five different microstep resolutions. It operates from 8 V to 35 V and can deliver up to 2 A per coil with sufficient additional cooling. Pololu 2128

High-power brushed DC motor with a 120:1 reduction gearbox, intended for operation at 4.5 V, 9.7mm-long gearbox, 3 mm-diameter D-shaped output shaft that is perpendicular to the motor shaft, and a built-in safety clutch. Pololu 1511