Here are 2 heat sensor circuits, first one is build with the 4060 IC, the second one is simpler than the one before and has fewer components. It is an ideal add on circuit to monitor heat in CD ...

This fire sensor circuit exploits the temperature sensing property of an ordinary signal diode IN 34 to detect heat from fire. At the moment it senses heat, a loud alarm simulating that of Fire ...

Self-powered heat sensor could help keep firefighters safe Lightweight triboelectric generator made from fabric powers a wearable fire warning system ...