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Showing posts from April, 2021

Building a Fun and Smart Home with a DIY Smart Doorbell

  Title: Building a Fun and Smart Home with a DIY Smart Doorbell Introduction: In the exciting world of electronics, there's nothing quite as thrilling as creating your very own smart home gadgets. Today, we'll embark on a journey to build a Smart Doorbell using simple and easily accessible equipment like the Arduino Uno, an IR proximity sensor, and a buzzer. This DIY project is not only a fantastic introduction to electronics but also a step towards transforming your home into a tech-savvy haven. So, gear up, young inventors, as we venture into the world of smart homes! Materials You'll Need: 1. Arduino Uno: The brain of our smart doorbell, capable of processing information and controlling the connected devices. 2. IR Proximity Sensor: A nifty gadget that detects the presence of objects in its vicinity. 3. Buzzer: This component will be the voice of our smart doorbell, alerting you when someone approaches. Step 1: Setting Up the Arduino Uno: Begin by connecting your Arduin...
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Amplitude Modulation

Amplitude modulation; Amplitude modulation ; Before we approach the term amplitude modulation , we first need to understand what we mean by the term modulation .  the term 'modulation' in electronics is simply a means of manipulating a signal. "Modulation is (electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude, frequency or phase". from this definition it is clear to us that a signal could be Amplitude modulated , Frequency modulated and Phase modulated.       Amplitude modulation simply means varying the amplitude of a signal ( carrier wave/signal) to carry useful information .Amplitude modulation as used in communication is the use of a low frequency audio signal to vary the amplitude of a high frequency signal(carrier signal), so that the resulting signal contains both the Audio signal and the High frequency signal. Tip:       imagine trying to throw a paper to a fa...
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Solar Energy harvesting and utilization

  The Solar Resource: The term “Solar Energy” refers to radiant heat and light from the sun. This energy travels over 93 million miles from the sun to the earth. As solar energy travels through the atmosphere to the earth’s surface, not all of the energy reaches the earth’s crust. The following diagram shows how solar energy travels through the atmosphere to the earth where it can be utilised. 
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555 TIMER IC

       THE 555 TIMER IC      The 555Timer IC is the most popular IC , it is an IC most electronics hobbyist/ enthusiast encounter . it is commonly used to produce variety of waveform using few external RC network.    The 555Timer gets it name from the facts that there are three internally connected 5kohms resistors , which is used to generate the two  comparator reference voltages( although , the CMOS version uses three 100kohms resistors) . it is a cheap IC and it's used in precision timing device which can act as either a simple timer to generate single pulses or long time delays or as a relaxation oscillator producing a stablized waveform of varying duty cycles (ranging from 50% to 100%). The 555Timer is made up of 8 pins and it appears in a DIP package (Dual- in- line package). The IC can be operated either as  a Monostable , Bistable or Astable multivibrator to produce a variety of timing operations such as pulse gene...
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