This module, a phototransistor, effectively detects infrared radiation, which is primarily used to detect fire as it emits a high amount of infrared radiation. However, the application is not limited to fire, but includes all sources of infrared waves, including the sun. The module's integrated comparator outputs digital (HIGH/LOW) or analog (0 V-5 V) signals depending on the intensity of the IR radiation. https://elecena.pl/product/25810913/333047-arduino-flame-sensor-analog-digital 2024-05-05 https://elecena.pl/product/25810913/333047-arduino-flame-sensor-analog-digital 2025-04-07