Quantity   Component name
1 × Paralax bot-bot chassie. Need the frame, 2 servo's and the roller wheel in the front.
1 × Any Arduino Most any model will work
1 × Arduino proto shield Not needed if you want to hardware your project.
1 × Ultrasonic Module HC-SR04 ( or similar).
1 × hookup wire
1 × Battery pack. I used a 4xAA pack anything to get power to the unix will work