Simple Fire Alarm System Circuit Diagram. The resistance of a thermistor varies. Mq6 gas sensor is also sensible to lpg alcohol and methane etc.
This circuit triggers the buzzer whenever it detects smoke or fire near by it. Here is a simple fire alarm circuit based on a light dependent resistor ldr and lamp pair for sensing the fire. The circuit produces an audible alarm when the fire breaks out with smoke.
The resistance of a thermistor varies.
Here is a simple fire alarm circuit based on a light dependent resistor ldr and lamp pair for sensing the fire. Here we are building one simple fire alarm system with the help of 555 timer ic which will sense the fire temperature rise in surrounding and trigger the alarm. The circuit produces an audible alarm when the fire breaks out with smoke. This simple fire alarm circuit can be used as a indicator or warning circuit for excessive fire and temperature.
