Automatic Light On Off Circuit Using Ldr

By this light activated switch in day light will automatically switched off and at night switch on light. You can use this for automatic light switch for street light. The transistor q1 will drive the transistor q2 to turn on the relay.

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During day time ldr gives a low resistance as a result the voltage through base is greater than 5v which switches the current to the emitter.

Automatic light on off circuit using ldr.

This circuit is very simple circuit and can be built with transistors and ldr you don t need any op amp or 555 ic to trigger the ac load. Some applications of this circuit are street light controlling home office light controlling day and night indicators etc. When intensity of light that falls on the ldr is less resistance of the ldr is high and this causes more voltage drop across ldr. The system is highly sensitive.

When there is high at base of q1 it will turn on. Ldr detects the light. Light intensity falling on ldr is less. The lights are turned on if the light is below a specific value.

Circuit diagram of automatic street light controller switch circuit components used in this circuit. When light is low. During night the ldr gives a high resistance as a result the voltage passing through the base will become less than 5v so the led glows. This turns led off.

Along with these a few more components are also used. The automatic street lights using ldr work according to the light. Ldr light depending resistor whose resistance is based upon the quantity of the light falling on it is the main component for sensing the light. When there is light on the ldr the resistance increases then there will be low at base of the transistor q1 then the transistor acts as off switch and turns off the relay.

It automatically switches off lights when sunlight fall on it i e on ldr e g in morning by using a sensor called ldr light dependent resistor which senses the light just like our eyes. When we say automatic night light circuit we may think about the nightlight street illumination system that automatically turns on at night and they turn off in the daytime all this automation process is possible with an electronic circuit that has a sensor that detects the sun intensity we will replicate this process but very simple with the help of a light depending resistor that has the. A simple dc motor electrical project. Automatic light operated controlled switch circuit using ldr is very interesting circuit idea.

Power supply 12v 1. Here we have used an ac bulb as street light. Working of automatic street light project using ldr with arduino arduino. Ldr light dependent resistor relay.

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