What are QTI sensors?

What are QTI sensors?

The QTI Sensor is an infrared emitter/receiver that is able to differentiate between a dark surface) with low IR reflectivity) and a light surface (with high IR reflectivity). These little sensors can be very handy for line following, maze navigation, or sensing the outer rim of a SumoBot ring.

How does the QTI sensor work?

The QTI module is designed for close-proximity infrared (IR) detection. The more infrared incident on the transistor’s base, the more current it conducts. When used as an analog sensor, the QTI can detect shades of gray on paper and distances over a short range if the light in the room remains constant.