Quantity   Component name
1 × E3Z-R61 (2-3m distance, IR sensor) or E3Z-LAS-R8, NPN NO (7-8m distance, Laser sensor)
1 × Reflector TD-05 (Better) or Reflector TD-08 (Worse)
1 × I2C SSD1315 128x64
1 × Wemos MINI PRO 4MB (Suitable for STL case) or NodeMCU ESP8266
1 × Push Button Switch and Resistor 10k (For button)
1 × Active Buzzer Module for Arduino