A set for building a balancing robot. It has a board with an ATmega 32u4 microcontroller, engine controllers, modules with quadrature encoders and an IMU system (gyroscope, accelerometer, magnetometer). Pololu 3575

Small metal gear motor, rotation speed 68 RPM, operating voltage 12 V. GA1218-N20W-0039

Small metal gear motor, rotation speed 136 RPM, operating voltage 12 V. GA1218-N20W-0040

Small metal gear motor, rotation speed 381 RPM, operating voltage 12 V. GA1218-N20W-0041

Compact and complete robot controller, containing the ATmega328P AVR microcontroller (with 32 KB of Flash memory and 2 KB of RAM memory) and a two-channel DC motor driver. Pololu 1220

Tracked chassis kit for the Pololu Zumo minisumo robot. The kit does not contain motors, batteries and electronic components. Pololu 1418

Tiny programmable module featuring Microchip’s PIC18F25K50 microcontroller. It packs a Micro-USB interface and 16 digital input/output pins onto a 1″×0.6″ board and ships preloaded with a USB bootloader, so no external programmer is required. Pololu 3150

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

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

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

Pololu low-power miniature engine, with a 15:1 transmission, shaft speed is 1400 rpm, torque is 0.2 kg * cm (0.02 Nm). Pololu 4783

Metal Worm Gear Motor, 3 RPM Rotation Speed, 12V Working Voltage. JGY370-28