A Fire detector is a device that detects Fire. Commercial, industrial, and mass residential devices issue a signal to a fire alarm system, while household detectors, known as Fire alarms, generally issue a local audible or visual alarm from the detector itself.Internally fire sensor contains darlington transistor pair.
Here fire sensor gives digital output i.e vcc or ground.
Fire sensor gives logic high when the light or fire fall on it, otherwise it gives ground voltage.
In the diagram current flowing from collector to the emitter in the case of fire occuring.so due to this we are getting voltage drop across the RL resistor.
Here fire sensor gives digital output i.e vcc or ground.
Fire sensor gives logic high when the light or fire fall on it, otherwise it gives ground voltage.
In the diagram current flowing from collector to the emitter in the case of fire occuring.so due to this we are getting voltage drop across the RL resistor.
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