Passive Infra-Red (PIR) sensors are used to detect motion based on the infrared heat in the surrounding area. This makes them a popular choice when building a system to detect potential intruders or people in general. These sensors can take for 10-60 seconds to warm up, so try to avoid motion during that time.
Basic motion detection.
The H8054 PIR motion detection module provides basic motion detection in a small package. Compatible with the Arduino and Raspberry Pi
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.
100 pack of black UV resistant nylon with flexible tape section, pull tight and does not come undone. Length 11 inches.
This is a small tracked robot equipped with 42mm motors, a motor controller, and Spektrum remote control. This is a customized prebuilt version of TP-230-042 with added track brackets.