2 Exploring New Automatic Street Light Circuits for Effective Urban Illumination, or "Enlightening the Night"

 Exploring New Automatic Street Light Circuits for Effective Urban Illumination, or "bringing light to darkness."

In this article we will go through two simple automatic street light circuits that use solar power and 220 V relays. All of the automatic street light circuits shown here can be used to turn on a lamp at night and turn it off during the day without anyone having to do it

What is a Street Light Automation System?

An automatic street light system is a device that checks how bright or dark it is outside. Then it turns a lamp on or off.

The automatic street light system does this based on how much light's outside.

When it gets really dark in the evening and the light is not enough the automatic street light system turns on a lamp that is connected to it.

This helps to make the space brighter.

On the hand when the sun starts to rise in the morning and it gets brighter the automatic street light system turns off the lamp.

The lamp turns on and off at times of the day and night without anyone needing to touch it.

The automatic street light system uses a part to check how bright or dark it is.

This special part can be something like an LDR or a photodiode or a phototransistor.

These parts are very good, at checking the levels and they help the automatic street light system to work properly.

What benefits can automatic street lamp systems offer?

The main advantages of using a street system are:

* It saves electricity by turning off the lamp when it's daytime and there is enough natural light to light up the streets.

The automatic street system helps conserve electricity by making sure the lamp is never left on during the day.

It also turns off the lamp when there is natural light to illuminate the streets.

* The automatic street system conserves personnel by not needing anyone to turn the lamp on or off.

This means that the automatic street system does not need human interaction to work properly.

Using a street system is a good idea because it does not need people to operate it.

This allows the automatic street system to work efficiently and it also saves money and time by removing human dependence on the automatic street system.

The automatic street system works accurately because it is monitored electronically.

The automatic street system operates with accuracy due, to its electronic monitoring and this is very effective.

Can we construct this at home?

Yes, you can create a home-based, extremely effective circuit for an automatic street light. This circuit can be constructed by even a complete novice in the field of electronics using very commonplace parts like transistors, resistors, and a relay.

However, in order to make this circuit, a person must be familiar with all the fundamental concepts of electronics as well as how to properly solder electrical components.

(1)Using a single transistor, an automatic street light

The first circuit diagram below demonstrates how a relay, an LDR, a few resistors, and a single transistor may be used to create a passable autonomous street lamp.

Parts List

All resistors are 1/4 watt 5% CFR

R1 = 1K

P1 = 10K preset

LDR1 = Any standard LDR

C1 = 220uF/25V electrolytic Capacitor

C2 = 10uF/25V Electrolytic Capacitor

C3 = 1000uF/25V Electrolytic Capacitor

D1----D5 = 1N4007 Diodes

T1 = BC547 Transistor

TR1 = 0-12V/500mA or 1Amp Transformer

RL1 = 12V Relay 200 to 400 ohm coil resistance

LED Bulb = LED bulb 220V/120V, 100 watt or as per street light requirement.

The circuit works in a way. The Light Dependent Resistor or LDR has resistance when it is daytime and there is a lot of light around. This low resistance keeps the base of the transistor close to the level, which is what the transistor needs to work. So the transistor stays turned on.

The relay keeps working. Its contacts stay in the normally open position when the transistor is turned on. The lamp stays turned off because it is connected to the closed position of the relay.

When it starts to get dark in the evening. There is less light the resistance of the LDR increases. This raises the ground potential on the base of the transistor. Stops the biasing potential from getting to the base.

The transistor turns off when this happens. When the transistor turns off its collector turns off too. This turns off the relay. The relay contacts move from the open position to the normally closed position.

This lets electricity get to the lamp. It turns on.

This same thing happens every morning when the light level on the LDR gets higher again. It happens every day.

The capacitors, at the base of the transistor and the relay make sure that the relay contacts switch smoothly when it is twilight and not suddenly.

To control when the relay turns on and off you can use the potentiometer or the preset to set the amount of light you want.

Keep in mind that when installing the street light circuit, you must make sure that the light from the bulb does not hit the LDR because doing so will cause the relay and the lamp to rapidly oscillate.

How to Set up

Keep the wiper at ground level.

Switch on the power supply.

Shine light on the LDR or the area where you want the relay to switch over.

Now slowly adjust the P1 preset until the relay just turns on.

Seal the preset with quick-fix glue.

Your circuit is ready now.

Next test it by covering the LDR with a shield you will see the LED bulb turn, on vice versa.

The circuit uses IC 555.

Although the transistorised above is straightforward, its operation might not be very precise. This indicates that the ON/OFF switching of the relay may not take place precisely at the same times of dawn and dusk.

The second design shown below successfully resolves this problem by utilising the IC 555.

Parts List

R1 = 220K 1/4 watt resistor or 1M preset

R2 = 1M 1/4 watt resistor

R3 = 10K 1/4 watt resistor

R4 = 100K 1/4 watt resistor

LDR1 = any standard LDR

C1 = 220uF electrolytic capacitor

D1 = 1N4007 Diode

T1 = BC547 transistor

IC1 = 555 IC

RL1 = 12V relay 200 to 400 ohm coil resistance

LED Bulb = any 100 watt LED bulb or as per the street light requirement

12V SMPS = 1no for powering the circuit

This IC 555-based automatic street lamp circuit is exceptionally accurate since it is controlled by an internal op amp. It will flip the relay consistently every day, almost at the same light levels, during the entire year.

The IC 555 is just used as a comparator in this application rather than being employed in its traditional form.

The suggeste potentiometer or a predetermined R1 can be used to set the trip point. If no exact adjustments are needed, R1 can be a fixed 220K resistor; otherwise, a 1M preset resistor can be used.

What it Does

The output pin#3 potential is high during the daytime when the LDR has enough light because the LDR resistance is low, keeping the pin#2 grounded.

As a result, the relay's contacts are held at N/C and it continues to be switched OFF. In turn, this results in the light bulb staying in the OFF position.

As night falls, the light on the LDR dims, increasing its resistance. Through R1, this results in the development of a positive potential on IC 555 pin#2. As a result, pin #3 becomes negative, turning on the relay. Now that the relay contacts have shifted, the bulb is turned on by the N/O.

In this circuit, the 555 IC functions as a comparator rather than an astable or monostable multivibrator. It's critical to comprehend how a 555 functions generally in order to comprehend this somewhat uncommon use: The output becomes high when input pin 2 receives a trigger (low pulse). A voltage that is less than one-third of the supply voltage is considered to be this low trigger pulse. The output returns to being low when the voltage at pin 6, the second input, briefly surpasses 2/3 of the supply level.

Since pin 6 is connected directly to the positive supply rail, the chip's output could still flip to the low state even though the second input pin 6 is not used in this configuration.

The level of hysteresis in the circuit can be changed by connecting a resistor between pins 5 and 7 of the 555. This is shown in the circuit diagram. The hysteresis level and the resistor value are connected in a way that when one is high the other's low.

You can start with a resistor value of 100K. See how it works.

* The resistor R1 can be replaced with a 1M potentiometer.

* This can also be a preset to change how fast the circuit responds.

The voltage that the circuit uses should be the same as the coil voltage of the relay.

However the voltage should not be than 16 V or the 555 may get damaged.

The circuit uses an amount of current which is 4 mA, when the supply voltage is 12 V.

This does not include the current used by the relay.

The relay starts working after a delay of about 2 seconds.

This delay is made possible by the components R2 and C1.

The circuit is not affected by changes in light because of these components.

The 555 and the circuit work well with the relay because of this delay.

The hysteresis level of the circuit is important, for its functioning.

The resistor value and the hysteresis level of the circuit are important to consider when building the circuit.

How to Construct

.With the aid of the following elements, the automatic street light circuit based on the IC 555 described above can be constructed:

Substitute a 1M preset for R1. Keep the wiper fully pointing in the positive direction.

Put a shield over the LDR that is opaque.

Next, turn on as much light as is necessary to illuminate the area where the relay changeover must occur.

Turn on the power and take the LED's cover off.

Now modify preset R1 so that the lamp just briefly turns off.

Your circuit is now prepared.

After that, try covering the LDR with your finger to see what happens. The bulb should be switched on immediately after the relay activates, and the lamp will be turned off when the finger is removed.

Conclusion:

Automatic street light circuits present an appealing alternative to achieve cities' goals of sustainability and efficiency. The presented circuits show how street lighting technology has advanced, from simple photocell control to complex IoT-enabled systems. Municipalities may improve safety and visibility while also advancing the more general objectives of energy conservation and smart city development by putting these intelligent ideas into practise.