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 ...

Circuit and Working: This fire extinguishing robot is a prototype (Fig. 1) of the actual one. Sensors used here are simple infrared (IR) photodiodes that detect IR rays coming out of the fire. The ...

At the heart of this overhead detector (fire alarm) circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, ...