Automatic Street Light Controller Circuit | Street Light Controller Circuit Using Relay and LDR

Automatic Street Light Controller Circuit | Automatic Street Light Controller Circuit Using Relay and LDR

Automatic Street Light Controller Circuit - Electronic Project


Many people have a power supply phobia of darkness, so to assist them in such situations, we have explained a simple circuit diagram that will automatically turn on the street light consisting of LEDs or bulbs coupled with a project system relay. It is lit well enough to see the power supply objects nearby. This circuit diagram is very easy to work around and also it is battery and operated. The power supply consumed by the circuit diagram is very low because of the very few components used in the circuit diagram. The whole circuit is based on IC LM358, which is basically an operational amplifier that is configured in a voltage comparator. LDR (Light-dependent resistor), whose resistance is based upon the quantity of the light falling on it, is the main component for sensing the light. Along with these, a Circuit diagram few more components is also used.

When we add the word smart to anything, at least we have some sense of automation, computers, and technology in general. The same is the case with automatic streetlights. An automatic street light is one which adapts to the surroundings be it environment or vehicle movement. According to the surroundings, it may turn on, go off, dim down, or brighten up. Take for example a street light that the power supply turns on by itself at night or a street light that dims down when there are no people or vehicles on the project system street. These are automatic or smart street lights.

We all have seen street lights on different streets, which provide light in the night and they are off during the daytime. Normally these street lights are controlled manually, where someone turns on these lights at night and turns off them in the daytime. But many times they forget to turn off it, which wastes lots of electricity. For this reason, in this project, we will design and make a simple circuit diagram that can solve this problem. This is the Automatic Street Light Project, which can turn ON and OFF the street lights automatically without human interference. it automatically turns ON the street light when the surroundings are dark (Night) and it automatically turns OFF the street light when it receives light from the surroundings (Daylight). It can save lots of power supply electricity and decrease human effort.

Diagram of Automatic Street Light Controller Circuit Using Relay and LDR:

automatic street light circuit

Components Needed for this Project:

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Working Principle of Automatic Street Light Working:

In this Automatic street light circuit diagram, we are using LDR, when light falls on the LDR in this Automatic Street Light Controller, power supply it becomes a less resistive element power supply, allowing bias to form at the project system transistor Q1 base. It activates transistor Q1. Because transistor Q2 has no bias at its base, as it remains turned off the Circuit diagram. The Relay coil does not receive a power supply in this situation, Project System therefore it remains turned off.

When no light falls on LDR, as it transforms into a highly resistant element Currenttlou. In this situation, as there is no bias at the base of the Q1 transistor, as therefore Q1 is turned off, and when bias is applied to the base of the Circuit diagram transistor, Q2 is turned on. The Relay coil now has electricity and is consequently activated. So, the output bulb glows. The purpose of this Automatic Street Light circuit is to turn ON a light bulb during night time and turn OFF during day time. Hence we used LDR as a light/dark sensing device (Place the sensor above or behind the light source, that is LDR should sense natural light only).

The output terminal from the operational amplifier is connected with the base terminal of transistor BC547, 12-volt SPDT Relay coil is connected between +12V and transistor Q1 Collector terminal. Variable Resistor RV1 gives the Sensitivity level to the inverting input of IC 741. Feedback Resistor connected between Output Pin and Inverting Pin.

When there is natural light then the LDR Resistance level goes down so that power supply voltage and current flow through R1 easily goes to the Circuit diagram ground or negative. Hence the Currenttlou inverting input receives low range voltage and current due to that Output voltage decreases and turns OFF the power supply transistor. So the Relay coil gets disconnected from the bias and turns OFF the light source connected with the common and N/O pins.

LDR Resistance level increases due to darkness after sunset. Hence the maximum voltage and current flow through R1 Reach the inverting input of Op-Amp, So the output voltage also increases and turns ON the transistor Q1 by the way the Relay coil gets biased and turns ON the light source connected with the common and N/O pins.


Frequently Asked Questions

What is the automatic street light circuit?

It automatically switches ON lights when the Circuit diagram sunlight goes below the visible region of our eyes. This is done by a sensor called Light Dependent and Resistor (LDR) which senses the light actually like our eye's Circuit diagram. It automatically switches OFF lights whenever the power supply sunlight comes, as visible to our eyes.

What is the mechanism of street light?

In this blog, we will explore the working mechanism of street lights Circuit diagram. A typical street light consists of several components, as including a power supply bulb or lamp, a ballast, a photocell, and a pole with a Project system fixture. The bulb or lamp is the source of light, while the ballast regulates the Circuit diagram electrical current to the bulb.

What is the voltage of a street light?

The operating voltage of a typical streetlight in the USA is usually around 120-277 volts. This range accommodates the different voltage levels used in various locations across the country.

Why is automatic street light important?

Installing automated streetlights can improve safety on roadways and in pedestrian areas at night. When sensors detect movement, the Currenttlou streetlights automatically turn on, The Circuit diagram provides better visibility and fewer shadows which can disguise traffic power supply dangers.

Which circuit is better for streetlights?

Streetlights are typically connected in a parallel circuit. This means that each street light is connected to the power source independently, allowing them to operate individually without affecting the others. This setup ensures that if one street light fails, the others can continue to function.

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