What is QTI sensor?
What is QTI sensor?
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 do you test a QTI sensor?
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. With this circuit, you can set P3 high and then test it with RCTIME to measure how long it takes the capacitor to discharge through the IR transistor.
How does the QTI module work?
The QTI module is designed for close-proximity infrared (IR) detection. Take a look at the small square black box just above the QTI label, it’s nested below the capacitor and between the two resistors. That’s a QRD1114 reflective-object sensor containing an infrared diode behind its clear window and an infrared transistor behind its black window.
How does the QTI line follower AppKit work?
The QTI Line Follower AppKit uses an array of QTI infrared emitter/receiver modules to easily enhance the line-following capability of your Boe-Bot , ActivityBot 360° , Arduino based Shield-Bot, or micro:bit based cyber:bot robot. Mount three or four sensors underneath the chassis, and adjust the position to detect lines of different widths.
What does rctime mean on a QTI?
Since the IR transistor conducts more or less current depending on how much IR it receives, the RCTIME measurement can give you an indication of distance or shade of gray. If all you want to know is whether a line is black or white, the QTI can also be converted to a digital sensor.
