Ionization Smoke Detectors An Ionization Smoke detector generally contains two chambers. The first is used as a reference to compensate for changes in ambient temperature, humidity, or pressure. The second chamber contains a radioactive source, usually alpha particle, which ionizes the air passing through the chamber where a current flows between two electrodes. When smoke enters the chamber the current flow decreases. The drop in current flow is used to initiate an alarm. Watch the video and an

Flame Sensor detector with police sirens alarm using ESP32, Flame sensor | Upload Ideas with Itamar