The KY-033 Line Tracking module is an infrared sensor that detects whether the surface in front of it is reflective or opaque. Sensitivity to ambient light can be adjusted using the knob to achieve a fairly accurate reading.
On the front side, this module has an infrared emitter/receiver, an adjustable potentiometer, a LM393 differential comparator, and an indicator LED. The back side has 4 resistors, two of which are 10 kΩ, one is 1.5 kΩ and the other one is 220 Ω.
The KY-033 has 3 pins: GND, OUT, and VCC. The output pin of the module is digital, its state is HIGH when the module is on top of a black surface, signaling that a line is detected. The state is LOW when the module is on top of a white surface, signaling that a line is not detected.
The indicator LED turns on when the infrared light is reflected back to the receiver, meaning that a line is not detected.
| Working voltage | 3.3V — 5.5V DC |
| Output signal | TTL level (high level if line detected, low if no line detected) |
| Board Size | 1cm x 4.2cm [0.39in x 1.65in] |
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