Introduction: Diy Fire Alarm

About: Hi, I am bharat .

hi and welcome to the another project i am going to show you a simple fire alarm circuit .this circuit is based on transistor switch like like my other projects.

Step 1:

it is made with only five components that and these are easily available.

Step 2:

here you can see complite circuit diagram that led is optional

Step 3:

Now connect battery with the circuit

Step 4:

you can see when i light a matchstick it emits infra red rays that is detected by ir photo diode and that put alarm on.infra red ray also presents in sunlight.almost all hot object emits ir rays.