Add quadrature encoders to your 20D mm metal gearmotors (extended back shaft version required) with this kit that uses a magnetic disc and Hall effect sensors to provide 20 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.

Brushed DC motor in a housing 130 supplied with a voltage ranging from 3 to 12 V, with a rotational speed of 11500 RPM and a current consumption of up to 800 mA. Pololu 1117

Pololu high power miniature motor with carbon brushes. 50:1 gear motor, shaft speed 420 rpm, torque 0,54kg*cm. The motor has an extended shaft, which makes it easy to attach the encoder. Pololu 2379

Metal Worm Gear Motor, 66 RPM Rotation Speed, 12V Working Voltage. JGY370-31

Metal Worm Gear Motor, 160 RPM Rotation Speed, 12V Working Voltage. JGY370-33

Metal Worm Gear Motor, 375 RPM Rotation Speed, 12V Working Voltage. JGY370-35

Motor with 37 mm diameter and 54 mm length, 50:1 metal gear, 24 V operating voltage, 0,1 A to 3 A power consumption, 200 RPM speed and 23 maximum torque. Pololu 4683

Solarbotics GMPW-R Red Wheel

Pololu Universal Aluminum Mounting Hub for 3mm Shaft, M3 Holes (2-Pack)

An educational robot buggy for beginners, which can be built and controlled using the micro:bit module. It is ideal for autonomous and remote-controlled projects. The MK2 is equipped with rubber O-ring wheels, which improves traction and allows you to overcome difficult surfaces, and the drive is provided by two servos, which can be controlled using PWM. Thanks to five RGB ZIP LEDs and easy-to-use dedicated blocks in the MakeCode editor, the kit allows for intuitive coding and adding visual effects and additional functions, such as indicators and reverse lights. Kitronik 5652

Small metal gear motor, 200 RPM speed, 12V operating voltage. GA12-N20-0024

Motor with 37 mm diameter and 57 mm length, 150:1 metal gear, 24 V operating voltage, 0,1 A to 3 A power consumption, 68 RPM speed and 56 maximum torque. Pololu 4687

This two-part aluminum assembly mounts directly to 5 mm diameter motor output shafts like those on many of our stepper motors and allows you to drive most scooter, skateboard, inline skate, and other common wheels that are compatible with popular 608 ball bearings.

Miniature, 6V brush DC motor with metal gear with 15,25:1 gear ratio. It has a cross section of 10 × 12 mm, and the D-shaped output shaft has a length of 10 mm and a diameter of 3 mm. Pololu 4787

A set of accessories for building an autonomous racing robot based on the popular NVIDIA Jetson Nano development kit.  Waveshare JetRacer Pro AI Kit Acce

Small metal gear motor, 500 RPM speed, 3V operating voltage. GA12-N20-0008

Bipolar stepper motor. It has a resolution of 200 steps/revolution (1.8° per step), has a nominal voltage of 4 V and draws a current of 1.2 A per coil. Pololu 1200

A set for building a vehicle powered by a DC motor with a propeller. Four-wheel design, powered by two 1.5V AA batteries

Small metal gear motor, 30 RPM speed, 3V operating voltage. GA12-N20-0001

A DIY spider robot that you can expand according to your own taste and ideas. There are two mounting options allowing you to change the stride length and gait of the spider. DFRobot ROB0103