A beginner-friendly overview of inexpensive sensors for small autonomous vehicles, covering line follower modules, various switch types (normally open, normally closed, tactile, lever, roller lever) for bumper applications, ultrasonic PING sensors for obstacle detection, and passive infrared sensors for temperature-based detection. Practical mounting tips are included, such as placing drop-off and line sensors at the front, and a warning about reversed ground/signal pins between Parallax and Radio Shack PING sensor variants.
