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RELAY

RELAY A relay is like a switch that can be controlled electronically. Relays are very simple devices and can be used to control devices with higher loads(Like AC controlled devices and devices that require heavy voltages to operate). Relay modules can be used mainly in IOT projects and home automation. Relays can be used to make useful hobby projects.  A two channel relay. *Dealing with high voltages may cause injuries or even death, please use relays with utmost care. Working of Relays. Relays work like electromagnets, when a voltage is applied the coil,  the coil gets charged and acts like an electromagnet and moves the switch to the desired position. In simple terms, relays act as magnets when a signal is applied or removed. Basic circuit of a relay Connections. +5V of Arduino-  5V of relay module. GND of Arduino- GND of relay module. Pin no. 8 of Arduino- In1 of relay module. Basic connection of a relay module CODE void setup() { pinMode(8, OUTPUT); } void loop() { digitalWrite(8,
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Problems with li-fi

Problems with lifi

We all know that li-fi is basically impenetrable. But there are a few loopholes in li-fi that might be known or unknown.
I am here to discuss few of the demerits of li-fi.
Now comes the demerit number one.

1. Though Getting on a li fi connection is easy,the threats are equal to the rf transmissions.
In rf transmission cancer is caused due to transfer of rf through different parts of the body. 
Where as, in lifi transmissions of uv and/or blue light reduces your ability to see, which might further lead to blindness(that’s for sure).

2. It’s faster but still hack able, just like any wifi device a lifi device is easily vulnerable(the same way a rf is hacked a vlf can be hacked). The only difference is light containing information has to be accessed by the hacker and viola, the same process as a rf device hacking takes place.

3. “Where there is light there is way”. Lifi can be accessed only where there are led’s and normal lights can’t be used. Though led’s are better in energy efficiency, number 1 still applies.

4. Speed is not always the answer. Even if lifi has ultra high speeds without sophisticated receiver circuits the data just turns out to be gibberish and we are left with a chunk of useless data.

5. If we want lifi everywhere, it would mean installation of more led’s and hence number 1 comes into play, also more led’s mean more power consumption, and leading to a point where power consumption can go up.

6. Disposal of used led’s. Led’s are nothing but diodes and diodes require doping. The doping then leads to formation of semiconductors, which we all know are the most difficult to decompose.

7. Incorporating lifi means changes in the phone market. All the wifi providers would have to change their ways of sending data in a lifi secure way, wifi Reuters will have to be change to lifi Reuters.
There should be a photodiode in every phone that means changes in design of the phone. Rooms having led’s are the only places that can access li fi. 

The above mentioned are some of the problems with lifi. They can be rectified with time but are not solved issues right now.

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