Automatic Light On Off Detector Circuit

This circuit can be used in alarm system where increasing intensity of light will trigger the alarm.

Automatic light on off detector circuit. It automatically switches on lights when the sunlight goes below the visible region of our eyes. Then automatic light switched on. This lamp will illuminate when the light bulb goes off into the evening and on beginning to dawn. An automatic light switch may also be useful in the garage laundry room or attic.

When any person animal or any object comes in the range of the sensor. Simple light detector circuit can be used in many applications like automatic switching of appliances up on detecting light security systems etc. A light detector senses light. In this circuit pir passive infrared motion sensor is used which is used as a motion detector.

This can also used in automatic room light when any person enter in the room then light automatic turn on. But at night is connected to a working electrical ac 220 volts. We can adjust the sensitivity using the preset vr1 10k. You can use this for automatic light switch for street light.

Occupancy sensors automatically turn the lights on when you enter a room and off when you leave. The manpower for controlling or switching operation of loads can be eliminated by using this automatic light sensor circuit works based on the intensity of daylight falling on the light sensor. 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. Automatic light detector using variable resistor.

This automatic night light circuit controls the turn the power off consumption in home automation. These are convenient for rooms and hallways that you use frequently or stairways that you tend to climb with your hands full. It can also be used in cupboards or wardrobes. Less resistance vr1 less darkness to switch off the led.

The automatic light sensor circuit can be used for controlling the electrical appliances such as light fan cooler air conditioner street light etc automatically. The led on and off when the amount of incident light rise or fall with respect to a threshold intensity value. 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. Such as the opening and closing of the bulb.

E g in evening after sunset. As the light level increases and ldr meets the lowest threshold resistance the circuit automatically turns on the led d1. If it is daytime working to break the circuit.