The A-Star 32U4 Mini ULV is a programmable module based on the ATmega32U4 from Atmel. Unlike competing products, it has an onboard switching step-up regulator that allows it to be powered efficiently from a 0.5 V to 5.5 V supply. Pololu 3102

The versatile Romi chassis is a great starting point for your next mobile robot. This kit includes all the basic mechanical parts to get up and running, including two motors, two wheels, one ball caster, and battery contacts. The wheels and ball are white; all other plastic components are pink.

This gearmotor is a miniature high-power, 6 V brushed DC motor with long-life carbon brushes and a 29.86:1 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.

This gearmotor is a miniature high-power, 6 V brushed DC motor with long-life carbon brushes and a 75.81:1 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 3064

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. This module is compatible with all of the Pololu dual-shaft mini plastic gearmotors. Pololu 1523

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.

This item is a set of three plastic rollers, a 1″-diameter plastic ball, and a retaining clip that can be used on the front or back ball caster locations on the Romi chassis base plate. The ball is white, and all other parts are red. It is included as part of the red Romi Chassis Kit.

This gearmotor is a miniature high-power, 6 V brushed DC motor with long-life carbon brushes and a 210.59:1 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. This version also has a 4.5 × 1 mm extended motor shaft.

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

Chassis Romi Chassis Kit is the ideal base for building a small mobile robot. The set contains all the necessary mechanical elements for building a mobile circular robot. Self-assembly set. Polol 3506

This gearmotor is a miniature high-power, 12 V brushed DC motor with long-life carbon brushes and a 100.37:1 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. This version also has a 4.5 × 1 mm extended motor shaft.

Key specs at 12 V: 320 RPM and 100 mA with no load, 30 oz-in (2.2 kg-cm) and 0.8 A at stall.

This gearmotor is a miniature medium-power, 6 V brushed DC motor with 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. This version also has a 4.5 × 1 mm extended motor shaft.

The Pololu Pushbutton Power Switches are sophisticated power control alternatives to bulky mechanical switches. The main function is pushbutton-based latching power control, where one push turns on power and another push turns it off.

The LSM6DS33 combines a digital 3-axis accelerometer and 3-axis gyroscope into a single package. The sensor provides six independent acceleration and rotation rate readings whose sensitivities can be set in the ranges of ±2 g to ±16 g and ±125°/s to ±2000°/s, available through I²C and SPI interfaces.

Kit includes all the basic mechanical parts to get up and running, including two motors, two wheels, one ball caster, and battery contacts. Pololu 3500

Black polyurethane scooter/skate wheel 100 × 24 mm, works with standard 608 bearings. Pololu 3278

Chassis Romi Chassis Kit is the ideal base for building a small mobile robot. The set contains all the necessary mechanical elements for building a mobile circular robot. Self-assembly set. Polol 3504

Module with a stepper motor driver based on the DRV8825 system. allows the bipolar motor to be supplied with current up to 1.5 A per phase, without the use of a heat sink. The system can be supplied with voltage up to 45 V. Pololu 2987

This gearmotor consists of a low-power, 12 V brushed DC motor combined with a 4.4:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 211.2 counts per revolution of the gearbox’s output shaft.

The A-Star 32U4 Mini LV is a programmable module based on the ATmega32U4 from Atmel. Unlike competing products, it has an onboard switching step-up/step-down regulator that allows it to be powered efficiently from a 2.7 V to 11.8 V supply. Pololu 3103