Automatic Light On Off Detector Circuit

Simple light detector circuit can be used in many applications like automatic switching of appliances up on detecting light security systems etc.

Automatic light on off detector circuit.

The automatic light sensor circuit can be used for controlling the electrical appliances such as light fan cooler air conditioner street light etc automatically. In this circuit pir passive infrared motion sensor is used which is used as a motion detector. This automatic night light circuit controls the turn the power off consumption in home automation. This circuit can be used in alarm system where increasing intensity of light will trigger the alarm.

Automatic on off light using op amp here unlike from a transistor circuit the output has only steady on state or off state for varying ambient light intensity. Occupancy sensors automatically turn the lights on when you enter a room and off when you leave. It automatically switches on lights when the sunlight goes below the visible region of our eyes. It can also be used in cupboards or wardrobes.

Automatic light detector using variable resistor. When any person animal or any object comes in the range of the sensor. Then automatic light switched on. If it is daytime working to break the circuit.

Automatic light operated controlled switch circuit using ldr is very interesting circuit idea. As the light level increases and ldr meets the lowest threshold resistance the circuit automatically turns on the led d1. Whereas the transistor circuits lights led gradually. E g in evening after sunset.

These are convenient for rooms and hallways that you use frequently or stairways that you tend to climb with your hands full. Less resistance vr1 less darkness to switch off the led. An automatic light switch may also be useful in the garage laundry room or attic. This can also used in automatic room light when any person enter in the room then light automatic turn on.

You can use this for automatic light switch for street light. This lamp will illuminate when the light bulb goes off into the evening and on beginning to dawn. The led on and off when the amount of incident light rise or fall with respect to a threshold intensity value. By this light activated switch in day light will automatically switched off and at night switch on light.

We can adjust the sensitivity using the preset vr1 10k. It is a simple and powerful concept which uses transistor bc 547 npn as a switch to switch on and off the street light system automatically. But at night is connected to a working electrical ac 220 volts.