Category: EE

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:

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:

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:

Arduino Based Guitar Tuner Hi guys, during th…

Arduino Based Guitar Tuner

Hi guys, during the last few weeks, I’ve been working on reconnecting with my love for the guitar. Playing the box guitar was how I relax few years back before the saxophone took over. Going back to the guitar, after 3 years of rarely strumming a chord, I discovered amongst other things that I no longer knew how each of the string should sound, to put it in my friend’s words, “My hearing was no longer tuned” and as a result of this, I was not able to tune the guitar without the aid of a keyboard or a mobile app which I later downloaded. The weeks went by till few days ago when the maker in me became motivated and I decided to build an Arduino based Guitar Tuner. In today’s tutorial, I will be sharing how to build your own DIY Arduino Guitar Tuner.

Find here the complete DIY project for Arduino Guitar Tuner:

DIY Breadboard Power Supply Circuit on PCB

DIY Breadboard Power Supply Circuit on PCB

A Power supply unit is a very commonly used tool by most engineers during the development stage. I personally use it a lot when experimenting with my circuit designs on Breadboard or to power up a simple module. Most of the digital circuits or embedded circuits have a standard operating voltage of either 5V or 3.3V, so I decided to build a Power supply which can supply 5V/3.3V on the power rails of the breadboard and fits snugly on the breadboard.

Analog Speedometer Using Arduino and IR Sensor

Analog Speedometer Using Arduino and IR Sensor

Measuring the speed/rpm of a Vehicle or a motor has always been a fascinating project to try. In this project, we are going to build a Analog Speedometer using the Arduino. We will use IR Sensor module to measure the speed. There are other ways/sensors for this, like hall sensor to measure speed, but using an IR sensor is easy because IR sensor module is very common device and we can get it easily from the market and also it can be used on any type of motor/Vehicle.

RFID Interfacing with PIC Microcontroller

RFID Interfacing with PIC Microcontroller

To read the Passive RFID cards and tag, we need a microcontroller with UART hardware. If we select a microcontroller without UART, we need to implement software UART. Here we are using PIC Microcontroller PIC16F877A for interfacing RFID. We will simply read the unique identification no. of RFID tags and display it on 16×2 LCD.

Check out the complete tutorial:

For more PIC microcontroller based projects and tutorials, visit:

Ask Embedded related questions: