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.

Automatic light operated controlled switch circuit using ldr is very interesting circuit idea. But at night is connected to a working electrical ac 220 volts. If it is daytime working to break the circuit. This automatic night light circuit controls the turn the power off consumption in home automation.

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. These are convenient for rooms and hallways that you use frequently or stairways that you tend to climb with your hands full. By this light activated switch in day light will automatically switched off and at night switch on light. Simple light detector circuit can be used in many applications like automatic switching of appliances up on detecting light security systems etc.

Then automatic light switched on. The led on and off when the amount of incident light rise or fall with respect to a threshold intensity value. E g in evening after sunset. This can also used in automatic room light when any person enter in the room then light automatic turn on.

In this circuit pir passive infrared motion sensor is used which is used as a motion detector. 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. This lamp will illuminate when the light bulb goes off into the evening and on beginning to dawn. As the light level increases and ldr meets the lowest threshold resistance the circuit automatically turns on the led d1.

An automatic light switch may also be useful in the garage laundry room or attic. It automatically switches on lights when the sunlight goes below the visible region of our eyes. Such as the opening and closing of the bulb. 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.

Automatic light detector using variable resistor. The automatic light sensor circuit can be used for controlling the electrical appliances such as light fan cooler air conditioner street light etc automatically. Less resistance vr1 less darkness to switch off the led. It can also be used in cupboards or wardrobes.

We can adjust the sensitivity using the preset vr1 10k. A light detector senses light. You can use this for automatic light switch for street light.