Simple Floor Mat Switch

Simple Floor Mat Switch 

This cool 555 IC circuit produces a warning beep when some one enters or crosses the prohibited area in your house or office. The switch can be hidden under floor mat, triggers the circuits to produce a beep when  someone presses it by foot.

Circuit diagram of mat switch

The switch that place under mat is of two conductive foam. It can be constructed by using two thin metal foils gummed together on opposite sides of a card board.  When the circuit switch is open, the transistor T1 is on off state since the lack of forward biasing at the base. When the switch closes by a an external object,  T1 will be on and it's collector voltage drops. This acts as a trigger input for IC 555.

Sound is produced for 50 seconds with preset values of R4 and C3. the pulse is applied through transistor T2. The duration of pulse can be changed by changing the values of R4 and C3.

                                                                                                          Submitted By
                                                                                                                              Hasifnoor_Attasheri
                                                                                                          Thank you !
                                                                                                          God Bless You