Category: EE

Introduction to Capacitors: Basic Concepts, W…

Introduction to Capacitors: Basic Concepts, Working, Types and Applications in Circuits

Capacitors – the word seems to suggest the idea of capacity, which according to the dictionary means ‘the ability to hold something’. That is exactly what a capacitor does
– it holds electric charge. But what makes it a common component in
almost all electronic circuits? Let us break down the stuff behind
capacitors to understand what it does and how one could use them in this

Circuit Digest 2018-10-04 11:41:40

Smart Phone Controlled Arduino Mood Light with Alarm

I recently purchased the NeoPixel LED strip and was quite impressed by the way it works. The tiny LED’s have an inbuilt driver IC which helps us to control each LED individually and can produce a wide spectrum of colors. Being a garish person who is obsessed with colours I really loved watching these tiny LED’s changing colors so I decided to build something on my own and leave it coloring my bedroom during night times.

IR based Wireless Audio Transmitter and Receiv…

IR based Wireless Audio Transmitter and Receiver Circuit

Today in this Article, we will learn how to build a Crude Wireless Audio Transfer Circuit Using IR LEDs. Using this circuit you should be able to play songs from your IPod, mobile or computer to an external speaker without having to connect them directly though an AUX cable. The circuit comes with many limitations and there are better ways like Bluetooth to play songs wirelessly, hence this article only aims to help you understand simple audio circuits and at the same time have fun building it.

Check out the complete project, here:

HM-10 Bluetooth ModuleThe HM-10 is a readily a…

HM-10 Bluetooth Module

The HM-10 is a readily available Bluetooth 4.0 module.
This module is used for establishing wireless data communication. The
module is designed by using the Texas Instruments CC2540 or CC2541 Bluetooth low energy (BLE) System on Chip (SoC). The module design and firmware originated from the Jinan Huamao Technology Company.

Raspberry Pi Based Jarvis themed Speaking Alar…

Raspberry Pi Based Jarvis themed Speaking Alarm Clock

“Good morning. It’s 7:00 a.m. The weather in Malibu is 72 degrees with scattered clouds. The surf conditions are fair with waist-to-shoulder high lines. High tide will be at 10:52 a.m”. Every time I hear this voice of Jarvis in the movie Iron Man it sends me chills down my spine. I am sure just like me many would have dreamt of living a life as sophisticated as Tony Stark. But sadly we have not advanced with technology for a miniature Arc reactor or an AI as smart as JARVIS. But it is possible to replace our boring morning alarm clocks with the one that is similar to Jarvis using a Raspberry Pi. At the end of this project, we will create a very basic GUI using which we can set an alarm and when the alarm goes on we will have a voice which tells us the current time and day with some pre-defined text. Sounds cool right!! So let us build one:

PIC18F4550 MicrocontrollerPIC18F4550 belong…



PIC18F4550 belongs to ‘PIC18F’
family of microcontrollers. PIC18F4550 is one of popular
Microcontrollers from the microchip technology, comes with
a High-Performance, Enhanced flash, USB Microcontroller with
nano-Watt-Technology. This is an 8-bit microcontroller popular among
makers and engineers due its features and easy applications. PIC18F4550
comes in various packages like DIP, QPF and QPN and can be selected
according to the project requirement.

Learn more about the PIC microcontroller:

IoT Based Patient Monitoring System using ESP8…

IoT Based Patient Monitoring System using ESP8266 and Arduino

Here in this project, we will make an IoT based Health Monitoring System which records the patient heart beat rate and body temperature and also send an email/SMS alert whenever those readings goes beyond critical values. Pulse rate and body temperature readings are recorded over ThingSpeak and Google sheets so that patient health can be monitored from anywhere in the world over internet. A panic will also be attached so that patient can press it on emergency to send email/sms to their relatives.

Check out the project details here:

What is PWM

What is PWM

While ADC is used to read Analog signals by a digital device like microcontroller. A PWM can be considered as an exact opposite of it, PWM is used to produce Analog signals from a digital device like microcontroller. In this article we will learn about what is PWM, PWM signals and some parameters associated with it, so that we will be confident in using them in our designs.

Learn about the PWM signals, here:

Thermal Printer interfacing with PIC16F877AIn …

Thermal Printer interfacing with PIC16F877A

In this tutorial, we will interface a thermal printer CSN A1 with widely used PIC microcontroller PIC16F877A. Here in this project, a thermal printer is connected across PIC16F877A and a tactile switch is used to start the printing. A notification LED is also used to notify the printing status. It will glow only when the printing activity is going on.

Check the complete project details:

TDA1554Q Audio AmplifierTDA1554Q is a 4*11W si…

TDA1554Q Audio Amplifier

TDA1554Q is a 4*11W single ended or 2*22W power amplifier IC, with an
integrated Class-B output amplifier. TDA1554Q comes in a 17 lead
single-in-line package. The internal circuitry contains a 4*11W single
ended or 2*22W bridge amplifier. Among all four amplifiers two are
inverting and other two are non-inverting. Also, each amplifier has a
gain of 20dB (26dB in BTL). TDA1554q also have mute/stand-by feature.

Learn more about the audio amplifier: