Quantity   Component name
1 × ATMEGA328P Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
1 × 128x32 OLED Screen bought at Adafruit.com
1 × Maxbotix Ultrasonic Rangefinder - LV-EZ1
1 × Speaker
1 × NPN transistor
2 × Tactile Switches
1 × L4931CD33 3v3 regulator Power Management ICs / Linear Voltage Regulators and LDOs