Whats a relay do?

Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. In addition, relays are also widely used to switch starting coils, heating elements, pilot lights and audible alarms.

How do you use an automatic street light?

An introduction: Needs no manual operation for switching ON and OFF. When there is a need of light it automatically switches ON. When darkness rises to a certain level then sensor circuit gets activated and switches ON and when there is other source of light i.e. daytime, the street light gets OFF.

Which sensor is used in street lights?

The infrared sensors are placed on each side of the road that are used to detect the vehicle movement and send the logic signals to a microcontroller (AT89S52 series) to turn on/ off the LEDs for a specific distance.

How do you make an automatic street light circuit?

How to Make Automatic Street Light

1. Step 1: Take All Components As Shown Below. Components required –
2. Step 2: Pins of BC547 Transistor.
3. Step 3: Connect LED.
4. Step 4: Solder LDR.
5. Step 5: Connect 20K Resistor.
6. Step 6: Solder Battery Clipper Wire.
7. Step 7: How to Use This Automatic Street Light.

How do automotive relays work?

In the most simple terms an automotive relay is an electronically operated switch. The type most commonly used in the automotive industry is an electro-mechanically operated switch. They employ an electromagnet device to mechanically manoeuvre a switch to make or break an electrical circuit.

What is automatic street light control?

Automatic street light system is a simple concept which uses transistor as a switch. By this system manual works are completely removed . It automatically switches on lights when the light goes below ambient light . This is done using LDR which senses the light.

What is automatic street light system?

An automated street lighting system is designed to automatically switch ON the Street Light alongside the roads( or path) or the light lamp just outside our house on the onset of dark weather or at dusk & switch them off automatically after sunrise or during the light hours.

How do sensors work in street lights?

Active infrared sensors emit low-level infrared energy into a specific zone to detect vehicles. When that energy is interrupted by the presence of a vehicle, the sensor sends a pulse to the traffic signal to change the light.

What is street light circuit?

Street light circuit. The circuit uses a Light Dependent Resistor (LDR) to sense the light . When there is light the resistance of LDR will be low. So the voltage drop across POT R2 will be high. This keeps the transistor Q1 ON. The collector of Q1(BC107) is coupled to base of Q2(SL100).

How does a Auto relay work?

Is a relay necessary for LED lights?

A relay is an electrical switch that lets a low current circuit control a high current circuit such as a large LED light bar. If you are using a light pod that does not have a very large amp draw, you may not need a relay switch, but if you are using a larger LED light bar, they are a must have.

How does a street light relay work?

The circuit employed here is an uncomplicated light/dark activated switch and contains a relay at its output, which simply turns ON/OFF a street light and further can be extended to control any electrical appliance in a household.

Why do we use relays in circuits?

Apart from switching a circuit with heavy load, on & off, a relay is required to 1. Conserve energy 2. Prolong the life of device 3. Improve the efficiency of a device. For example let us take the switching of two headlamps of an automobile.

How to turn on automatic street lights at night?

Relay turned ON the AC load that is connected to relay. A 10K pot is also used for setting up the sensitivity of the circuit. So this is how automatic Street Lights turns on in the night and turn off in the day, check the Demonstration Video below.

What are sequential relays used for?

Sequential relays can be used to power multiple components in turn, typically in a set order. A common application for this type of relay involves powering multiple systems or sets of lights one after another, such as in runway lights or power supply sequencing.