RFID card

Interfacing RFID to 8051microcontroller

praveen July 29, 2015 1 Comment
Interfacing RFID  to 8051 . RFID or Radio Frequency Identification is a method in which electromagnetic waves are used for transmitting data for the purpose of identifying tags attached to objects. An RFID system consists of a transmitter (tag) and a reader.The tag is encrypted with a unique code and the reader scans this code for the identification purpose. The tags are generally of two types: active and passive. Active tags have a battery fitted to it and it transmits the unique...
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interfacing PIR sensor and 8051

Interfacing PIR sensor to 8051

praveen February 25, 2016 7 Comments
Interfacing PIR sensor to 8051 microcontroller. PIR sensors are widely used in motion detecting devices. This article is about interfacing a PIR sensor to 8051 microcontroller. A practical intruder alarm system using PIR sensor and 8051 microcontroller is also included at the end of this article. Before going in to the core of the article, let’s have a look at the PIR sensor and its working. PIR sensor. PIR sensor is the abbreviation of Passive Infrared Sensor. It measures the...
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GSM based Fire Alarm Project

GSM based SMS Alert Fire Alarm System using Arduino

jojo August 10, 2016 104 Comments
In this article,we are going to build a Fire Alarm System using Arduino, LM35 Temperature Sensor and GSM Module. The objectives of this fire detector using arduino is to sense the surroundings for occurrence of fire with help of LM35 temperature sensor, and send 3 SMS alerts to two mobile numbers stored inside the arduino program if fire is detected (using GSM Module). We have developed a very good tutorial on how to interface GSM Module with Arduino and send/receive...
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Simple RFID based Door Lock using Arduino

jojo April 7, 2015 6 Comments
Its quiet fun to work with RFID based projects! In the previous article, we saw how to interface RFID with Arduino. Interfacing is the first step to create any useful project. So why don’t we create an RFID based Access Control System or an RFID based Door Lock using Arduino? The system I have designed here is a simple version of the project. This project can be enhanced with a lot of features (which I will be doing in...
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Interfacing RFID with Arduino – How to Read RFID Cards using Arduino

jojo March 26, 2015 12 Comments
In this tutorial, we are dealing with yet another interfacing technique. This time we are interfacing an RFID Reader which can read RFID Tags to Arduino. RFID is Radio Frequency Identification. An RFID reader is used to read RFID tags (which contain certain unique data stored in a chip). An RFID reader and an RFID tag, both have a coil surrounding them.  When an RFID tag is shown near an RFID Reader, it collects the unique tag data (a...
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How to Interface GSM Module to Arduino-Send and Receive SMS

jojo December 23, 2016 70 Comments
In this article, we are going to see how to interface GSM Module to Arduino. There are different kinds of GSM modules available in market. We are using the most popular module based on Simcom SIM900 and Arduino Uno for this tutorial. Interfacing a GSM module to Arduino is pretty simple. You only need to make 3 connections between the gsm module and arduino. So lets get to business! A GSM Module is basically a GSM Modem  (like SIM...
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Frequency counter using arduino

praveen February 19, 2015 13 Comments
Frequency counter using Arduino (upto 40KHz). Many guys here were asking for a frequency counter and at last I got enough time to make one.  This frequency counter using arduino is based on the UNO version and can count up to 40KHz. A 16×2 LCD display is used for displaying the frequency count. The circuit has minimum external components and directly counts the frequency. Any way the amplitude of the input frequency must not be greater than 5V. If...
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IPCA Electronics Expo 2015 – Revolutionizing the Make in India campaign

jojo January 7, 2015 2 Comments
A new year has began and people all over the world are looking forward with good hope. What’s in cards for people in the Electronics industry ? Well, the 8th IPCA Electronics Expo India scheduled to happen on August 20-22, 2015 is definitely an event to look forward. This event attended by industry leaders in different sectors of electronics is all set to take place in Pragati Maidan, New Delhi, India. IPCA Electronics Expo’s aims to provide the electronics...
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Interfacing pressure sensor to arduino

praveen August 14, 2017 6 Comments
Interfacing SPD005G pressure sensor to arduino This article is about interfacing pressure sensor to Arduino. The pressure sensor used here is SPD005G from Smartec . SPD (Smart Pressure Device) is a series of silicon based pressure sensors suitable for industrial as well as house hold applications. These sensors are generally available in plastic inline or dual inline packaging. SPD sensors are generally available in two operation modes namely gauge type and absolute type. In gauge type, the pressure is...
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We Are Launching An Online Store to Shop Electronic Kits,Boards and Components

jojo May 28, 2015 10 Comments
Hi Everyone, Today we are announcing a happy news in CircuitsToday. We are launching an Online Store at Store.CircuitsToday.com We will be Live from today, 18th December 2014. We are launching with only 8051 Micro controller based Project Kits for Engineering Students and Hobbyists. We will be adding more inventories very soon in our online shop. You can expect popular and commonly used products for sale in coming months. WE WILL BE SELLING MAJOR ELECTRONIC COMPONENTS DEVELOPMENT KITS  PROGRAMMERS...
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Digital Code Lock using Arduino with LCD Display and User Defined Password

praveen December 5, 2014 39 Comments
We have published a digital code lock using arduino some weeks before. This one is a little different. The earlier version was based on a defined password, where the user can not change it. Moreover there was no LCD display interfaced with the project to output lock status. This project is a much improved version of the same digital code lock which comes with a user defined password and LCD display. The user will be prompted to set a...
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Arduino Projects -The Big List of Arduino Based Projects

jojo September 21, 2017 11 Comments
In this article, we compile all the best and interesting projects we have developed using Arduino. These days Arduino projects are used for academic course fulfillment as well. In any case, Arduino is a very interesting platform to build real world projects. List of Arduino Projects Gas Leakage Detector with GSM Module for SMS Alert and Sound Alarm  An Arduino Uno board is interfaced with  a MQ5 gas sensor and GSM Module in this project. This project – named...
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Interfacing gyroscope to arduino

praveen December 9, 2014 3 Comments
Interfacing gyroscope to arduino uno. This article is about interfacing gyroscope to arduino. Gyroscope is a device used for measuring the angular velocity in the three axes. It works under the concepts of angular momentum and can be used to determine the orientation of an object. Typical applications of gyroscope includes missile guidance, flight control, smart phones, game station joy sticks etc. Mechanical gyroscopes, MEMS gyroscope, optic fiber gyroscope, ring laser gyroscope. Here we deal with the MEMS gyroscope....
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LPG sensor using arduino

praveen November 18, 2014 7 Comments
LPG sensor using arduino with alarm and cutoff. A simple LPG sensor using arduino is shown in this article. This circuit indicates the amount of LPG in the air. The circuit  sounds an alarm and trips a relay  when the concentration is above a predetermined level. MQ2 is the gas sensor used in this project. MQ2 is an SnO2 based gas sensor which can sense gases like methane, propane, butane, alcohol, smoke, hydrogen etc. Since LPG primarily contains propane...
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OhmMeter using Arduino – with Auto Ranging Feature

praveen November 18, 2014 11 Comments
Auto ranging ohmmeter using arduino. This article is about a simple auto ranging ohmmeter using arduino. The measured resistance is displayed using a 16×2 LCD display. The circuit is sufficiently accurate and uses minimum number of external components possible. Before going into the details of this project, lets have a look at the basic resistance measurement method. Resistance measurement. The figure above shows the circuit diagram of a simple resistance measurement scheme. Rx is the resistance to be measured....
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8051 Timers and Counters

jojo October 27, 2014 3 Comments
In this article, we focus on Timers/Counters of the 8051 micro controller. The 8051 has two counters/timers which can be used either as timer to generate a time delay or as counter to count events happening outside the microcontroller.                       The 8051 has two timers: timer0 and timer1. They can be used either as timers or as counters. Both timers are 16 bits wide. Since the 8051 has an 8-bit architecture, each 16-bit is accessed as two separate registers...
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We are on all Social Media – Youtube Facebook Twitter Linkedin and Slideshare

jojo October 21, 2014 No Comments
Hello Everyone,  Lets hope a good day for all! We have been live from 2008 till this date serving you all with fun electronic circuits and projects. In this long span of 6 years, we have come up with a handful of interesting electronic circuits and we have written a couple of good tutorials on micro controllers like 8051, AVR, PIC etc. At the same time, we know we could have done a lot more for the electronics community!...
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Water level controller using arduino

praveen January 23, 2018 38 Comments
Arduino water level controller / indicator. This article is a about a fully functional water level controller using Arduino. The circuit displays the  level of water in the tank and switches the motor ON when the water level goes below  a predetermined level. The circuit automatically switches the motor OFF when the tank is full. The water level and other important data are displayed on a 16×2 LCD display. The circuit also monitors the level of water in the...
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DIY Digital Clock with Temperature Display using PIC Controller

jojo December 31, 2014 6 Comments
One of the most enjoyable part of being an electronics person is creating your own gadgets and using them in daily life. In this article, we are building one of those with the help of SoloPCB design tools, a digital desk clock with temperature display feature.   The brain of the circuit is a Microchip PIC18F252 microcontroller. It acquires precise time information from DS1307 real time clock via I2C interface and displays it on four digit 38 mm seven-segment...
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Tachometer using arduino

praveen January 13, 2015 10 Comments
Digital tachometer using arduino plus speed control. Tachometer is a device used for measuring the number of revolutions of an object in a given interval of time. Usually it is expressed in revolutions per minute or RPM. Earlier tachometers purely mechanical where the revolution is transferred to the tachometer through mechanical coupling (cable or shaft) , the rpm is determined using a gear mechanism and it is displayed on a dial. With the advent of modern electronics, the tachometers...
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Interfacing LCD to Arduino – Display Text and Characters on LCD Screen using Arduino

praveen March 12, 2016 21 Comments
A Liquid Crystal Display commonly abbreviated as LCD is basically a display unit built using Liquid Crystal technology. When we build real life/real world electronics based projects, we need a medium/device to display output values and messages. The most basic form of electronic display available is 7 Segment display – which has its own limitations. The next best available option is Liquid Crystal Displays which comes in different size specifications. Out of all available LCD modules in market, the...
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Motor speed control using arduino

praveen June 12, 2014 5 Comments
PWM motor speed control using Arduino. PWM or pulse width modulation is a very common method used for controlling the power across devices like motor, light etc. In PWM method the power across the load  is controlled by varying the duty cycle of the drive signal. More the duty cycle more power is delivered across the load and less the duty cycle, less power is delivered across the load. A hex keypad is used for controlling the speed. The...
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Digital code lock using arduino

praveen April 22, 2015 11 Comments
Simple digital code lock using arduino. Digital code lock or digital combination lock are a type of  digital locks where a combination of digits/characters or both are used for unlocking the lock. This article is about a simple digital code lock using arduino. Here the code consists of a combination of  digits from 1 to 6. There are separate keys for locking and unlocking the system. The system can be unlocked by pressing the unlock button after entering the...
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Interfacing hex keypad to arduino

praveen December 5, 2014 5 Comments
Interfacing hex keypad to arduino uno. This article is about how to interface a hex keypad to arduino. Hex keypad is a very important component in embedded systems and the typical applications are code locks, calculators, automation systems or simply any thing that requires a character  or numeric input. This project will display the pressed key in the serial monitor window of the arduino IDE. The same project can be modified to display the pressed key on 7-segment LED...
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Digital thermometer using arduino

praveen June 19, 2014 9 Comments
Digital thermometer using arduino and LM35. This article is about a simple three digit digital thermometer using arduino. Range of this thermometer is from 0°C to 99.9°C. There is also a provision for displaying the temperature in °F scale. Three terminal analog temperature sensor LM35 is used as the sensor here. LM35 can measure temperatures between -55°C to +155°C. The supply voltage range is from 4V to 30V DC and the current drain is 60uA. The LM35 is available...
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