LIGHT SENSOR 220VAC

In this project we will make a sensor that detects darkness and turns on a 220VAC light bulb.

For this project we will see the operation of the LDR, a variable resistance due to light or lighting, at night it behaves with a very high resistance reaching mega OHMS but when it detects light its resistance decreases almost to 0 OHMS, this will allow us to compare those factors and design it for our purpose.

This project has a source on the same PCB so that the electronic circuit works at 5V and has a 220VAC voltage as its input and also as its output to activate the 220VAC light bulb, so we will no longer need an external source for our circuit.

GERBER PCB:

https://mega.nz/file/XMBF3aaS#xal7KxNg6Se7WUmSQ16fi3MBuKPYuhvwgqAnO-QNleY

Here we will see the operation by means of a voltage divider between the resistor R1 and the LDR through these two resistors we will detect a positive current and a negative current.

When there is darkness, a positive current will reach the base of the transistor, activating the RELAY and the 220VAC bulb.

When there is light, a negative current will reach the base of the transistor, deactivating the RELAY and therefore the relay and the 220VAC bulb do not work.

Photoresistors or LDR (from the English Light Depending Resistor) are a type of resistor whose value depends on the light they are receiving. It is very small when it receives a very intense light (a few Ωs), and increases in value as the light it receives decreases.

They are typically used in two ways, for an automatic lighting system that turns on when there is little ambient light, or to detect nearby motion if something comes between the light bulb and the photoresistor.

Photoresistors have only two legs, just like normal resistors, so to measure a voltage variation (as we have done with potentiometers) we will have to use a little trick that will serve us for many other things.

·        SOURCE AC/DC MODULE POWER 220VAC/5VDC 1st

·        1 BJT TRANSISTOR 2N2222A

·        1 RESISTOR 10K 1/2W

·        1 LDR

·        1 DIODE 1N4148

·        1 RELAY 5VDC

·        2 TERMINAL BOARDS 10A

·        1PCB

·        VIN 220VAC

·        Output voltage 220VAC

·        1 RELAY output

·        I MAX 100mA

·        light sensitive

·        compact circuit

·        output current 10A

This project was made in the Easyeda software as we can see the tracks and the 3D image of the project working perfectly are no difficulty

PCBWAY has 10 years in the electronics industry manufacturing professional PCBs, assembling PCBs managing to satisfy the demands of all parts of the world, in addition to meeting the highest quality and delivery time standards. PCBWAY allows the manufacture of your PCBs from 5 units.

This project was carried out thanks to PCBWAY, a company dedicated to the manufacture of prototypes and professional PCBs, in addition to offering you a ready assembly service with all the components in your PCBS, complying with the established quality and delivery time standards.

We thank PCBWAY, a leading company for manufacturing and assembling professional PCBs with the highest quality, PCBWAY has fair reasonable prices, punctual shipping time and 24-hour customer service, it also offers you the option of quoting all its services in his web page. Do not think twice and start manufacturing your professional PCBs from 5 units safely.

10pcbs at $5 order them here www.pcbway.com

We thank PCBWAY for the professional pcb they provide us for this project.

GERBER PCB:

https://mega.nz/file/XMBF3aaS#xal7KxNg6Se7WUmSQ16fi3MBuKPYuhvwgqAnO-QNleY