Quantity   Component name
1 × Arduino Uno
1 × HC-SR04 based Ultrasonic Distance Sensor
1 × L9110S H Bridge Stepper Motor Dual DC Driver Controller Board Module for Arduino
1 × IR Obstacle Avoidance Sensor Module
2 × Salvaged motors and gearboxes
1 × (currently) square piece of plywood
1 × Slave HC-06 Wireless Bluetooth Transceiver RF Master Module