DRV8825 Stepper Motor Driver Carrier with male header pins installed, so no soldering is required to use it with an appropriate 16-pin socket or solderless breadboard. Pololu 2982

This compact, inexpensive plastic gearmotor (brushed DC motor with a 120:1 reduction gearbox) is well suited for use in small robots. While intended for operation at 4.5 V, it should run comfortably in the 3 V to 6 V range.

USB-TTL converter with CP2102N chip, which enables stable serial communication between computer and TTL devices, supporting baud rates up to 3 Mbps. The module operates at 3.3 V by default, tolerant of 5 V on inputs, and its compact size and standard 2.54 mm pitch make it easy to integrate into projects. Pololu 1317

This compact, inexpensive plastic gearmotor (high-power brushed DC motor with a 120:1 reduction gearbox) is well suited for use in small robots. While intended for operation at 4.5 V, it should run comfortably in the 3 V to 6 V range.

These lightweight aluminum brackets make it easy to mount and integrate the Sharp GP2Y0A02, GP2Y0A21, and GP2Y0A41 Distance Sensors into your project. The brackets are strong enough to hold their position, but they can also be bent by hand to different angles if the application calls for it.

Module with a stepper motor driver based on the DRV8434 system. It allows you to power a bipolar motor with a current of up to 1.2 A per phase and a voltage from 4.5 V to 48 V. Pololu 3762

These 17 mm long aluminum adapters convert a 3 mm diameter shaft to a 12 mm hex shaft that compatible with many common hobby RC wheels. The set includes two adapters, two M4 screws for securing wheels to the adapters, four M3 set screws for securing the adapters to motor shafts, and one 1.5 mm Allen wrench for use with the set screws.

Motor with 25 mm diameter and 54 mm length, 75:1 metal gear, 12 V operating voltage, 0,1 A to 1,1 A power consumption, 71 RPM speed and 6 maximum torque. Pololu 3254

Motor with 25 mm diameter and 54 mm length, 99:1 metal gear, 12 V operating voltage, 0,1 A to 1,1 A power consumption, 55 RPM speed and 8 maximum torque. Pololu 3255

Step-Down converter D36V50F9 with an output voltage of 9 V, an input voltage from 9.9 to 50 V and a maximum output current of 7 A. Pololu 4094

Motor with 25 mm diameter and 52 mm length, 47:1 metal gear, 12 V operating voltage, 0,1 A to 1,1 A power consumption, 110 RPM speed and 4,3 maximum torque. Pololu 3253

Motor with 25 mm diameter and 71 mm length, 172:1 metal gear, 12 V operating voltage, 0,1 A to 1,1 A power consumption, 31 RPM speed, 13 maximum torque and 48 CPR encoder. Pololu 4888

Motor with 25 mm diameter and 48 mm length, 9,7:1 metal gear, 12 V  operating voltage, 0,1 A to 1,1 A power consumption, 560 RPM speed and 1 maximum torque. Pololu 3250

Motor with 25 mm diameter and 71 mm length, 227:1 metal gear, 12 V operating voltage, 0,1 A to 1,1 A power consumption, 23 RPM speed, 17 maximum torque and 48 CPR encoder. Pololu 4889

Motor with 25 mm diameter and 52 mm length, 34:1 metal gear, 12 V operating voltage, 0,1 A to 1,1 A power consumption, 150 RPM speed and 3 maximum torque. Pololu 3252

This set of two quadrature encoders for 20D extended-shaft motors provides precise rotational speed monitoring with 20 pulses per motor revolution. The devices utilize magnetic disc and Hall-effect sensors operating from 2.7-18V, and the digital outputs can be connected directly to a microcontroller. The encoders mount directly to the back of the motor, and the compact design and 6-pin JST PH connectors facilitate integration into robotic projects and control systems. Pololu 5661

Step-Down DC-DC converter module based on the D36V6F3 system. Input voltage 4 ... 50V, output voltage 3.3V (max. 600mA). Polol 3791

Motor with 25 mm diameter and 73 mm length, 378:1 metal gear, 12 V operating voltage, 0,1 A to 1,1 A power consumption, 14 RPM speed, 23 maximum torque and 48 CPR encoder. Pololu 4890

This set of two quadrature encoders for 20D extended-shaft motors provides precise rotational speed monitoring with 20 pulses per revolution of the motor shaft. The devices utilize a magnetic disc and Hall-effect sensors operating from 2.7-18V, and the digital outputs can be connected directly to a microcontroller. The encoders mount directly to the back of the motor, and the compact design and 6-pin JST PH connectors facilitate integration into robotic projects and control systems. Pololu 5660

Motor with 25 mm diameter and 48 mm length, 4,4:1 metal gear, 12 V  operating voltage, 0,02 A to 1,1 A power consumption, 1200 RPM speed and 0,6 maximum torque. Pololu 3249