When the QTI sensor is over a dark surface, the reflectivity is very low; when the QTI is over a light surface, the reflectivity is very high and will cause a different reading from the sensor.
The QTI Line Follower Kit adds line-following capability to the BoE-Bot.
The QTR-1A reflectance sensor carries a single infrared LED and phototransistor pair in an inexpensive, tiny 0.5" x 0.3" module that can be mounted almost anywhere and is great for edge detection and line following applications. This sensor is sold in packs of two units.
Every laser needs a holder!
What is a 'laser card' you ask? It is the coolest thing, like all things laser!
This is the basic laser card module with circuitry built in so that it can be turned on/off with a TTL signal.
A very powerful 5mW green laser. Fun, but don't point in anyone's eyes.