Bell-Cum light Controller Circut

Bell cum light controller is a simple project done by DBRT students. There are four switches used in this project.Switch s1 is at the outer entry of the gate and is used by visitor.This switch activates the bell for the duration that switch is pressed.On its released the timer is initialised, which in turn switches on a bulb to light up path between the outer gate and house door.s2 switches on the light in the house for 3 minutes.It is used by the inhibitants of the house.It is used with the darkenss when s4 is ON.

When switch is pressed ON it activates the bell circuit only.It works even if the power is OFF as it runs on 3 volt battery.

switch s4 routes the supply to bulb through the relay.