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

Rechargeable NiMH AAA Battery: 1.2 V, 900 mAh, 1 cell

The Step-Up Buck Voltage Regulator module with adjustable output voltage in range of 2.5-9.5V with a input voltage range of 1.5-16V and a maximum output current of 2A. Pololu 791

The holder for 2 AA R6 double-row batteries is an ideal solution for people who need a simple and reliable way to connect AA batteries to obtain a voltage of 3 V

The holder for 4 AA R6 double-row batteries is an ideal solution for people who need a simple and reliable way to connect AA batteries to obtain a voltage of 6 V

Holder for 3 AA R3 batteries with a flap and a switch is an ideal solution for people who need a simple and reliable way to connect AAA batteries to obtain a voltage of 4.5 V

Holder for 3 AA R6 batteries with a flap and a switch is an ideal solution for people who need a simple and reliable way to connect AA batteries to obtain a voltage of 4,5 V

Holder for 2 AA R6 batteries with a flap and a switch is an ideal solution for people who need a simple and reliable way to connect AA batteries to obtain a voltage of 3 V

Holder for 4 AA R6 batteries with a flap and a switch is an ideal solution for people who need a simple and reliable way to connect AA batteries to obtain a voltage of 6 V

The Step-Down D24V6AHV Buck Voltage Regulator module with adjustable output voltage in the range of 4-25V with a wide input voltage range of 4.5-42V and a maximum output current of 600 mA. Pololu 2104

Machine Screw: #2-56, 7/16" Length, Phillips (25-pack)

1660-Point Breadboard