Amazon.com: UMLIFE 10pcs Hall Sensors Module 3144E Hall Switch Speed Magnetic Swiches Speed Counting Sensor Module for Arduino Smart Car : Industrial & Scientific
1pcs Tcrt5000 Infrared Reflective Sensor Ir Photoelectric Switch Barrier Line Track Module For Arduino Diode Triode Board 3.3v - Sensors - AliExpress
Light sensing with the Flying-Fish series from MH - Hackster.io