Day Night Light Sensor Switch 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. Connect sensor s black wire to black wire coming from house. The circuit of light sensor switch circuit is shown in figure 1 and is built around very popular operational amplifier ic light dependent resistor ldr a general purpose pnp transistor and few other components like resistor relay etc.

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The working of this night light circuit very simple.

Day night light sensor switch circuit.

Black wire is 120 volts so turn off switch or circuit breaker. Here is my wiring diagram third photo and instructions. We should make a 9 volts dc power supply and connects them together as figure 2 figure 2 block diagram and 9 volts dc regulation of daylight sensor switch circuit. At day time the resistance of the ldr will be low and so do the voltage drop across it the transistor q1 will be in.

The circuit can be used as a commercial automatic street light control system as a domestic porch light or corridor light controller or simply can be used by any school kid for displaying the feature in his school fair exhibition the following content describes four simple ways of making a. Connect red sensor wire to light s black wire. Thus we can term it as an automatic light sensor circuit. Now wasn t that easy.

Just install this smart ldr dusk to dawn sensor twilight switch at your home office warehouse factory or farm and watch your electricity bills cut down. Since we have 12v ct 12v or 24vct transformer so set this circuit form. The circuit will automatically switch on the ac lamp when night falls and the lamp will be automatically switched off after a preset time. Un boxing and full review of photo cell sensor day and light automatic off no current wast auto trigger when contact with light best quality product.

An ldr is used as the sensor here. This small day night switch can switch on any electrical device automatically when dark falls and switch off in the morning automatically. Automatic daylight sensor switch project then we apply the above circuit to make the automatic air pump. For description we had divided the entire circuit into three main sections.

Connect all 3 white wires from house from sensor and from light together. The 4 simple light activated day night switch circuits explained here can all be used for controlling a load normally a 220v lamp in response to the varying levels of the surrounding ambient light.

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