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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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Li-Fi receivers, How do they work?

 LI-FI RECEIVERS

Hello, everyone, this blog post is meant to give you a basic idea on how li-fi receivers work. You might know that there are various components we can use as li-fi receivers, most of the receivers work on the same principle. Why are they called li-fi receivers?, How do they work?, What makes them so important? and many more questions will be attempted to be solved.

Different components that can use as a Li-fi receiver

  • A photo-diode 
  • A photo-transistor
  • An LDR
  • A solar panel 

How it works?

All of the above components work almost in the same way. All of them receive a signal via light and gives out an analog signal. The signal speeds depend on the color of light and that is because each light has different chemicals(some light up quicker than others, and transfer data quicker). Coming back to our receivers, they receive analog signals that can be converted to digital signals and can be used as receivers.

PHOTODIODES

 These devices take in light of different wavelengths and give out currents of equivalent wavelengths.
They work best in reverse biased conditions.

PHOTOTRANSISTORS

These devices take in light and amplify it to get proper signals without a need of a transistor.

LDRS

These devices are not very useful receivers, they respond very slow. But these devices can receive light signals easily for small projects.

SOLAR PANELS

We all know that these panels are meant to produce power, but they are photodiodes if ripped down to the smallest unit. They are a set of photodiodes together.

  


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