This is a very small light sensor. A photo resistor (also known as a photodector, or photocell) changes resistance depending on the amount of light it is exposed to.
The H8054 PIR motion detection module provides basic motion detection in a small package. Compatible with the Arduino and Raspberry Pi
The HC-SR501 is a passive infro-red (PIR) sensor which is used to detect motion based on the infrared heat in the surrounding area.
Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor.
This is a prebuilt MLT-JR tracked robot platform equipped with 12V 32-millimeter motors, a motor controller and an authentic Arduino for autonomous control.