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Showing posts from December, 2018

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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Astable multivibrator

Astable multivibrator Astable Multivibrators are free running oscillators which oscillate between two states continually producing two square wave output waveforms.            Introduction  Regenerative switching circuits such as  Astable Multivibrators   are the most commonly used type of relaxation oscillator because not only are they simple, reliable and ease of construction they also produce a constant square wave output waveform. Unlike the Monostable Multivibrator or the Bistable Multivibrator we looked at in the previous tutorials that require an “external” trigger pulse for their operation, the  Astable Multivibrator  has automatic built in triggering which switches it continuously between its two unstable states both set and reset. The  Astable Multivibrator  is another type of cross-coupled transistor switching circuit that has  NO  stable output states as it changes from one state to the other all ...
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Diy project- inverter using 555timer

Today we are going to make a inverter using a 555timer.like I said earlier on principle of operation of an inverter (my previous post) we need an oscillating circuit and we are going to use an astable multivibrator (A astable multivibrator is an oscillating circuit that produce rectangular wave without the aid of an external triggering) such as a 555timer     Here below is the electronic components needed for this circuitry 1.555timer 2.BC547 npn transistor 3.15k resistor (4) 4.100k resistor 5.2N6292 transistor  6.12v battery 7.12-0-12 transformer 8.a breadboard or veroboard  or you can create a PCB (any of your choice) and a heat sink for the 2N6292 transistor. OK here is the circuit diagram Then you start the connection that all for now. Www.mydronelab.blogspot.com
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Electrical waveform -Monostable multivibrator

Monostable multivibrator Multivibrators are Sequential regenerative circuits either synchronous or asynchronous and are used extensively in electronic timing applications.                     Introduction Multivibrators produce an output wave shape resembling that of a symmetrical or asymmetrical square wave and as such are the most commonly used of all the square wave generators. Multivibrators belong to a family of oscillators commonly called “ Relaxation Oscillators “. Generally speaking, discrete multivibrators consist of a two transistor cross coupled switching circuit designed so that one or more of its outputs are fed back as an input to the other transistor with a resistor and capacitor (  RC  ) network connected across them to produce the feedback tank circuit. Multivibrators have two different electrical states, an output “HIGH” state and an output “LOW” state giving them either a stable or quasi-stable sta...
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Waveform Generator

Electrical waveform  Electronic systems use an extremely wide variety of signal waveform types and shapes from sinusoidal to those created by waveform generators In the  Oscillators   tutorials we saw that an oscillator is an electronic circuit used to generate a continuous output signal. Generally this output signal is in the form of a sinusoid at some predetermined frequency or wavelength set by the resonant components of the circuit. We also saw that there are many different types of oscillator circuits available but generally they all consist of an amplifier and either an Inductor-Capacitor, ( LC ) or Resistor-Capacitor, ( RC ) tank circuit used to produce a sine wave type output signal. Typical Electrical Waveform But sometimes in electronic circuits we need to produce many different types, frequencies and shapes of  Signal Waveforms  such as Square Waves, Rectangular Waves, Triangular Waves, Sawtoothed Waveforms and...
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