“This robot build is meant to be relatively cheap and quick. Here is what you will need to get started:
Hardware
1 Raspberry Pi
1 Dual H-Bridge Motor Driver
1 Buck Converter
2 3V-6V DC Motors
HC-SR04 Ultrasonic Sensor
Other
A box to act as a chassis
My box is 7.5” x 4” x 2”
A hot glue gun
A knife or pair of scissors
A soldering iron”