My Light Diagram

This article helps you to make a Light Sensitive Morning Alarm circuit. The morning light is sensed by an LDR (Light Dependent Resistor) or Photoresistor and it triggers the alarming section. The circuit generates a melodious tone when light falls on it. Wire-up the circuit as shown in schematic diagram and place the LDR next to the window pane closer to your bed. The LDR is more sensitive to light, so make sure it will not be false triggered. All the electronic components used in this circuit is cheap, so you can make this at your own home at very low cost and it consumes very less power, hence it ensures long working life. Read More.....

Description  Circuit showing a Burglar Alarm.Here we have used a ldr and a switching transistor for making this circuit .When the light coming towards the ldr during the period the ldr have low resistance so the buzzer will on.When the light going away the ldr during the period the ldr have high resistance so the transistor will off.Here you need a 12 volt power supply Burglar Alarm Using LDR and BC 548 Circuit diagram    Components Required       Resistor                    10 k(preset)       Transistor                    BC 548        LDR         Buzzer

This is a light switch or light activated relay circuit .The relay on when LDR uncoverd and relay off when LDR covered .Adjust VR1 for light sensitive.LED will turn on at the same time with relay