Automatic Light On Off Detector Circuit

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 on off detector circuit.

It can also be used in cupboards or wardrobes. When any person animal or any object comes in the range of the sensor. We can adjust the sensitivity using the preset vr1 10k. This circuit can be used in alarm system where increasing intensity of light will trigger the alarm.

The automatic light sensor circuit can be used for controlling the electrical appliances such as light fan cooler air conditioner street light etc automatically. This can also used in automatic room light when any person enter in the room then light automatic turn on. Then automatic light switched on. If it is daytime working to break the circuit.

E g in evening after sunset. 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. An automatic light switch may also be useful in the garage laundry room or attic. Occupancy sensors automatically turn the lights on when you enter a room and off when you leave.

Simple light detector circuit can be used in many applications like automatic switching of appliances up on detecting light security systems etc. As the light level increases and ldr meets the lowest threshold resistance the circuit automatically turns on the led d1. These are convenient for rooms and hallways that you use frequently or stairways that you tend to climb with your hands full. This automatic night light circuit controls the turn the power off consumption in home automation.

This lamp will illuminate when the light bulb goes off into the evening and on beginning to dawn. You can use this for automatic light switch for street light. Whereas the transistor circuits lights led gradually. In this circuit pir passive infrared motion sensor is used which is used as a motion detector.

Such as the opening and closing of the bulb. A light detector senses light. It automatically switches on lights when the sunlight goes below the visible region of our eyes. Automatic light operated controlled switch circuit using ldr is very interesting circuit idea.

Automatic light detector using variable resistor. But at night is connected to a working electrical ac 220 volts. 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.