Automatic Light On Off Detector Circuit

Whereas the transistor circuits lights led gradually.

Automatic light on off detector circuit.

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. Then automatic light switched on. By this light activated switch in day light will automatically switched off and at night switch on light. 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.

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. Less resistance vr1 less darkness to switch off the led. Automatic light operated controlled switch circuit using ldr is very interesting circuit idea. Automatic light detector using variable resistor.

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. This circuit can be used in alarm system where increasing intensity of light will trigger the alarm. As the light level increases and ldr meets the lowest threshold resistance the circuit automatically turns on the led d1.

Such as the opening and closing of the bulb. A light detector senses light. This automatic night light circuit controls the turn the power off consumption in home automation. Simple light detector circuit can be used in many applications like automatic switching of appliances up on detecting light security systems etc.

But at night is connected to a working electrical ac 220 volts. An automatic light switch may also be useful in the garage laundry room or attic. We can adjust the sensitivity using the preset vr1 10k. 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. It automatically switches on lights when the sunlight goes below the visible region of our eyes. In this circuit pir passive infrared motion sensor is used which is used as a motion detector. If it is daytime working to break the circuit.

It can also be used in cupboards or wardrobes. These are convenient for rooms and hallways that you use frequently or stairways that you tend to climb with your hands full. This lamp will illuminate when the light bulb goes off into the evening and on beginning to dawn.