Mh Sensor Series Flying Fish Ir Sensor Datasheet Fixed [hot] -

Your object is too shiny or too dark. This sensor hates glossy white surfaces (reflects too well) and pure black surfaces (absorbs all IR). For line following, use white tape on black paper.

Pro Tip: Some clones swap VCC and OUT. If the LED stays on permanently, swap those two wires. Mh Sensor Series Flying Fish Ir Sensor Datasheet Fixed